commit c37ca9ba52fe9bee8d06df249ba51be4b7302b89
Author: Bailey Taylor <bailey@yeahnah.net>
Date:   Thu Feb 19 13:51:07 2026 +0800

    First commit in rust

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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b202488
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,42 @@
+[workspace]
+resolver = "2"
+members = [
+    "backchannel-common",
+    "backchannel-server",
+    "backchannel-client",
+]
+
+[workspace.dependencies]
+# Serialization
+serde       = { version = "1", features = ["derive"] }
+serde_json  = "1"
+
+# IDs / time
+uuid   = { version = "1", features = ["v4", "serde"] }
+chrono = { version = "0.4", features = ["serde"] }
+
+# Error handling
+thiserror = "1"
+anyhow    = "1"
+
+# Observability
+tracing            = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+# Encoding
+base64 = "0.22"
+
+# Crypto
+rand             = "0.8"
+argon2           = "0.5"
+ed25519-dalek    = { version = "2", features = ["rand_core"] }
+x25519-dalek     = { version = "2", features = ["static_secrets"] }
+chacha20poly1305 = "0.10"
+hkdf             = "0.12"
+sha2             = "0.10"
+
+# Async runtime
+tokio = { version = "1", features = ["full"] }
+
+# WebSocket
+tokio-tungstenite = "0.21"
diff --git a/backchannel-client/Cargo.toml b/backchannel-client/Cargo.toml
new file mode 100644
index 0000000..a5748b7
--- /dev/null
+++ b/backchannel-client/Cargo.toml
@@ -0,0 +1,33 @@
+[package]
+name    = "backchannel-client"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "backchannel"
+path = "src/main.rs"
+
+[dependencies]
+backchannel-common = { path = "../backchannel-common" }
+
+serde            = { workspace = true }
+serde_json       = { workspace = true }
+uuid             = { workspace = true }
+chrono           = { workspace = true }
+thiserror        = { workspace = true }
+anyhow           = { workspace = true }
+tracing          = { workspace = true }
+tracing-subscriber = { workspace = true }
+base64           = { workspace = true }
+rand             = { workspace = true }
+ed25519-dalek    = { workspace = true }
+x25519-dalek     = { workspace = true }
+chacha20poly1305 = { workspace = true }
+hkdf             = { workspace = true }
+sha2             = { workspace = true }
+tokio            = { workspace = true }
+tokio-tungstenite = { version = "0.21", features = ["rustls-tls-native-roots"] }
+futures-util = "0.3"
+
+ratatui   = "0.26"
+crossterm = "0.27"
diff --git a/backchannel-client/src/config.rs b/backchannel-client/src/config.rs
new file mode 100644
index 0000000..f36b7ae
--- /dev/null
+++ b/backchannel-client/src/config.rs
@@ -0,0 +1,24 @@
+/// Runtime configuration for the BackChannel client.
+pub struct ClientConfig {
+    /// WebSocket server URL, e.g. `ws://127.0.0.1:7777` or `wss://server:7777`.
+    pub server_url: String,
+
+    /// Path to the keystore JSON file (holds the Ed25519 identity keypair).
+    pub keystore_path: String,
+}
+
+impl ClientConfig {
+    pub fn from_env() -> Self {
+        let server_url = std::env::var("BC_SERVER_URL")
+            .unwrap_or_else(|_| "ws://127.0.0.1:7777".into());
+
+        let keystore_path = std::env::var("BC_KEYSTORE").unwrap_or_else(|_| {
+            let home = std::env::var("USERPROFILE")
+                .or_else(|_| std::env::var("HOME"))
+                .unwrap_or_else(|_| ".".into());
+            format!("{}/.backchannel/keystore.json", home)
+        });
+
+        Self { server_url, keystore_path }
+    }
+}
diff --git a/backchannel-client/src/crypto/dm.rs b/backchannel-client/src/crypto/dm.rs
new file mode 100644
index 0000000..f2bf7af
--- /dev/null
+++ b/backchannel-client/src/crypto/dm.rs
@@ -0,0 +1,36 @@
+use backchannel_common::crypto::{aead, ecdh};
+use x25519_dalek::EphemeralSecret;
+
+use crate::error::Result;
+
+/// Generate an ephemeral X25519 keypair to initiate a DM key exchange.
+///
+/// Returns the `EphemeralSecret` (store in `Keystore::pending_ecdh`) and the
+/// base64-encoded public key to send to the server.
+pub fn generate_exchange() -> (EphemeralSecret, String) {
+    let (secret, pubkey) = ecdh::generate_ephemeral();
+    let pubkey_b64 = ecdh::pubkey_to_b64(&pubkey);
+    (secret, pubkey_b64)
+}
+
+/// Complete a key exchange given our ephemeral secret and the peer's base64
+/// public key. Returns the 32-byte derived DM session key.
+///
+/// The `EphemeralSecret` is consumed here — it cannot be reused.
+pub fn complete_exchange(our_secret: EphemeralSecret, their_pubkey_b64: &str) -> Result<[u8; 32]> {
+    let their_pubkey = ecdh::b64_to_pubkey(their_pubkey_b64)?;
+    let raw_secret   = ecdh::diffie_hellman(our_secret, &their_pubkey);
+    Ok(aead::derive_dm_key(&raw_secret))
+}
+
+/// Encrypt a plaintext DM using a derived session key.
+/// Returns `(ciphertext_b64, nonce_b64)`.
+pub fn encrypt(key: &[u8; 32], plaintext: &str) -> Result<(String, String)> {
+    aead::encrypt(key, plaintext.as_bytes()).map_err(Into::into)
+}
+
+/// Decrypt a received DM ciphertext using a derived session key.
+pub fn decrypt(key: &[u8; 32], nonce_b64: &str, ciphertext_b64: &str) -> Result<String> {
+    let bytes = aead::decrypt(key, nonce_b64, ciphertext_b64)?;
+    Ok(String::from_utf8(bytes)?)
+}
diff --git a/backchannel-client/src/crypto/mod.rs b/backchannel-client/src/crypto/mod.rs
new file mode 100644
index 0000000..49336a7
--- /dev/null
+++ b/backchannel-client/src/crypto/mod.rs
@@ -0,0 +1 @@
+pub mod dm;
diff --git a/backchannel-client/src/error.rs b/backchannel-client/src/error.rs
new file mode 100644
index 0000000..05c3249
--- /dev/null
+++ b/backchannel-client/src/error.rs
@@ -0,0 +1,30 @@
+use thiserror::Error;
+
+pub type Result<T> = std::result::Result<T, ClientError>;
+
+#[derive(Debug, Error)]
+pub enum ClientError {
+    #[error("not authenticated")]
+    NotAuthenticated,
+
+    #[error("server error {code}: {message}")]
+    Server { code: u16, message: String },
+
+    #[error("no DM key for peer — initiate key exchange first")]
+    NoDmKey,
+
+    #[error("crypto error: {0}")]
+    Crypto(#[from] backchannel_common::BackchannelError),
+
+    #[error("serialization error: {0}")]
+    Json(#[from] serde_json::Error),
+
+    #[error("I/O error: {0}")]
+    Io(#[from] std::io::Error),
+
+    #[error("UTF-8 error: {0}")]
+    Utf8(#[from] std::string::FromUtf8Error),
+
+    #[error("{0}")]
+    Other(String),
+}
diff --git a/backchannel-client/src/keystore.rs b/backchannel-client/src/keystore.rs
new file mode 100644
index 0000000..b557841
--- /dev/null
+++ b/backchannel-client/src/keystore.rs
@@ -0,0 +1,91 @@
+use std::collections::HashMap;
+use std::fs;
+use std::path::Path;
+
+use ed25519_dalek::{SigningKey, VerifyingKey};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+use x25519_dalek::EphemeralSecret;
+
+use backchannel_common::crypto::identity;
+
+use crate::error::{ClientError, Result};
+
+/// On-disk representation of the keystore.
+#[derive(Serialize, Deserialize)]
+struct KeystoreFile {
+    /// Base64-encoded Ed25519 signing key (32 bytes).
+    signing_key_b64: String,
+}
+
+/// Holds cryptographic material for the local client.
+pub struct Keystore {
+    pub signing_key:   SigningKey,
+    pub verifying_key: VerifyingKey,
+
+    /// Derived DM session keys cached in memory: peer_user_id → 32-byte key.
+    /// Populated after completing an X25519 key exchange.
+    pub dm_keys: HashMap<Uuid, [u8; 32]>,
+
+    /// Ephemeral secrets awaiting the remote party's public key.
+    /// Keyed by the peer's user UUID. Consumed on exchange completion.
+    pub pending_ecdh: HashMap<Uuid, EphemeralSecret>,
+}
+
+impl Keystore {
+    /// Load an existing keystore from `path`, or generate a fresh one and save it.
+    pub fn load_or_create(path: &str) -> Result<Self> {
+        if Path::new(path).exists() {
+            let contents = fs::read_to_string(path)?;
+            let file: KeystoreFile =
+                serde_json::from_str(&contents).map_err(ClientError::Json)?;
+            let signing_key   = identity::b64_to_signing_key(&file.signing_key_b64)?;
+            let verifying_key = signing_key.verifying_key();
+            tracing::debug!("Loaded keystore from {}", path);
+            Ok(Self::from_signing_key(signing_key, verifying_key))
+        } else {
+            let (signing_key, verifying_key) = identity::generate_keypair();
+            let file = KeystoreFile {
+                signing_key_b64: identity::signing_key_to_b64(&signing_key),
+            };
+            if let Some(parent) = Path::new(path).parent() {
+                fs::create_dir_all(parent)?;
+            }
+            fs::write(path, serde_json::to_string_pretty(&file)?)?;
+            tracing::info!("Generated new identity keypair, saved to {}", path);
+            Ok(Self::from_signing_key(signing_key, verifying_key))
+        }
+    }
+
+    fn from_signing_key(signing_key: SigningKey, verifying_key: VerifyingKey) -> Self {
+        Self {
+            signing_key,
+            verifying_key,
+            dm_keys:      HashMap::new(),
+            pending_ecdh: HashMap::new(),
+        }
+    }
+
+    /// Base64-encoded Ed25519 public key, suitable for sending to the server.
+    pub fn identity_pubkey_b64(&self) -> String {
+        identity::pubkey_to_b64(&self.verifying_key)
+    }
+
+    /// Store an `EphemeralSecret` while waiting for the remote peer's response.
+    pub fn store_pending_ecdh(&mut self, peer_id: Uuid, secret: EphemeralSecret) {
+        self.pending_ecdh.insert(peer_id, secret);
+    }
+
+    /// Retrieve and remove a pending ephemeral secret (consumed by ECDH).
+    pub fn take_pending_ecdh(&mut self, peer_id: Uuid) -> Option<EphemeralSecret> {
+        self.pending_ecdh.remove(&peer_id)
+    }
+
+    pub fn cache_dm_key(&mut self, peer_id: Uuid, key: [u8; 32]) {
+        self.dm_keys.insert(peer_id, key);
+    }
+
+    pub fn get_dm_key(&self, peer_id: &Uuid) -> Option<&[u8; 32]> {
+        self.dm_keys.get(peer_id)
+    }
+}
diff --git a/backchannel-client/src/main.rs b/backchannel-client/src/main.rs
new file mode 100644
index 0000000..3ccd582
--- /dev/null
+++ b/backchannel-client/src/main.rs
@@ -0,0 +1,53 @@
+mod config;
+mod crypto;
+mod error;
+mod keystore;
+mod net;
+mod tui;
+
+use std::io;
+
+use anyhow::Result;
+use crossterm::{
+    execute,
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+};
+use ratatui::{backend::CrosstermBackend, Terminal};
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "backchannel=info".into()),
+        )
+        .with_writer(std::io::stderr) // keep TUI output clean
+        .init();
+
+    let cfg = config::ClientConfig::from_env();
+
+    let keystore = keystore::Keystore::load_or_create(&cfg.keystore_path)?;
+
+    tracing::info!("Connecting to {}", cfg.server_url);
+    let (net_tx, mut server_rx) = net::connection::connect(&cfg.server_url).await?;
+
+    let app = &mut tui::app::App::new(net_tx, keystore);
+
+    // ── Terminal setup ────────────────────────────────────────────────────
+    enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    execute!(stdout, EnterAlternateScreen)?;
+    let backend  = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+    terminal.clear()?;
+
+    // ── Main event loop ───────────────────────────────────────────────────
+    let result = tui::events::run(app, &mut terminal, &mut server_rx).await;
+
+    // ── Cleanup (always run, even on error) ───────────────────────────────
+    disable_raw_mode()?;
+    execute!(terminal.backend_mut(), LeaveAlternateScreen)?;
+    terminal.show_cursor()?;
+
+    result
+}
diff --git a/backchannel-client/src/net/connection.rs b/backchannel-client/src/net/connection.rs
new file mode 100644
index 0000000..c7b940e
--- /dev/null
+++ b/backchannel-client/src/net/connection.rs
@@ -0,0 +1,66 @@
+use anyhow::{Context, Result};
+use futures_util::{SinkExt, StreamExt};
+use tokio::sync::mpsc;
+use tokio_tungstenite::{connect_async, tungstenite::Message as WsMessage};
+
+use backchannel_common::protocol::{ClientMessage, ServerMessage};
+
+/// Connect to the BackChannel server and return a pair of mpsc channels:
+///
+/// - `UnboundedSender<ClientMessage>` — send messages **to** the server
+/// - `UnboundedReceiver<ServerMessage>` — receive messages **from** the server
+///
+/// Two background tasks handle the actual WebSocket I/O so the caller never
+/// touches the raw stream.
+pub async fn connect(
+    server_url: &str,
+) -> Result<(
+    mpsc::UnboundedSender<ClientMessage>,
+    mpsc::UnboundedReceiver<ServerMessage>,
+)> {
+    let (ws_stream, _) = connect_async(server_url)
+        .await
+        .with_context(|| format!("Failed to connect to {}", server_url))?;
+
+    let (mut ws_sink, mut ws_source) = ws_stream.split();
+
+    let (client_tx, mut client_rx) = mpsc::unbounded_channel::<ClientMessage>();
+    let (server_tx, server_rx)     = mpsc::unbounded_channel::<ServerMessage>();
+
+    // Outbound: client_rx → WS sink
+    tokio::spawn(async move {
+        while let Some(msg) = client_rx.recv().await {
+            match serde_json::to_string(&msg) {
+                Ok(json) => {
+                    if ws_sink.send(WsMessage::Text(json)).await.is_err() {
+                        break;
+                    }
+                }
+                Err(e) => tracing::error!("Failed to serialize outbound message: {}", e),
+            }
+        }
+    });
+
+    // Inbound: WS source → server_tx
+    tokio::spawn(async move {
+        while let Some(item) = ws_source.next().await {
+            match item {
+                Ok(WsMessage::Text(text)) => {
+                    match serde_json::from_str::<ServerMessage>(&text) {
+                        Ok(msg) => {
+                            if server_tx.send(msg).is_err() {
+                                break; // receiver dropped; shut down
+                            }
+                        }
+                        Err(e) => tracing::warn!("Failed to parse server message: {}", e),
+                    }
+                }
+                Ok(WsMessage::Close(_)) | Err(_) => break,
+                Ok(_) => {}
+            }
+        }
+        tracing::info!("Connection to server closed");
+    });
+
+    Ok((client_tx, server_rx))
+}
diff --git a/backchannel-client/src/net/mod.rs b/backchannel-client/src/net/mod.rs
new file mode 100644
index 0000000..b3b606b
--- /dev/null
+++ b/backchannel-client/src/net/mod.rs
@@ -0,0 +1 @@
+pub mod connection;
diff --git a/backchannel-client/src/tui/app.rs b/backchannel-client/src/tui/app.rs
new file mode 100644
index 0000000..0f6c99d
--- /dev/null
+++ b/backchannel-client/src/tui/app.rs
@@ -0,0 +1,351 @@
+use std::collections::{HashMap, VecDeque};
+
+use backchannel_common::protocol::{ClientMessage, ServerMessage};
+use chrono::Local;
+use tokio::sync::mpsc;
+use uuid::Uuid;
+
+use crate::keystore::Keystore;
+
+const MAX_MESSAGES: usize = 500;
+
+/// What the TUI is currently displaying.
+#[derive(Debug, Clone, PartialEq)]
+pub enum View {
+    Login,
+    Channel,
+    Dm,
+}
+
+/// Which input field is focused on the login screen.
+#[derive(Debug, Clone, PartialEq)]
+pub enum LoginField {
+    Username,
+    Password,
+}
+
+/// A single chat message for display.
+#[derive(Debug, Clone)]
+pub struct ChatMessage {
+    pub author:    String,
+    pub content:   String,
+    pub timestamp: String,
+}
+
+/// All mutable state for the TUI application.
+pub struct App {
+    // ── Navigation ────────────────────────────────────────────────────────
+    pub view:        View,
+    pub should_quit: bool,
+
+    // ── Login screen ─────────────────────────────────────────────────────
+    pub login_username: String,
+    pub login_password: String,
+    pub login_field:    LoginField,
+    pub login_register: bool, // toggle between Login and Register mode
+    pub status_msg:     Option<String>,
+
+    // ── Auth state ────────────────────────────────────────────────────────
+    pub my_user_id: Option<Uuid>,
+    pub my_username: Option<String>,
+
+    // ── Channel state ─────────────────────────────────────────────────────
+    pub channels:         Vec<(Uuid, String)>,      // (id, name)
+    pub selected_channel: usize,
+    pub channel_messages: HashMap<Uuid, VecDeque<ChatMessage>>,
+
+    // ── DM state ──────────────────────────────────────────────────────────
+    pub dm_peer_id:   Option<Uuid>,
+    pub dm_peer_name: Option<String>,
+    pub dm_messages:  HashMap<Uuid, VecDeque<ChatMessage>>,
+
+    // ── Text input (shared between channel + DM views) ────────────────────
+    pub input: String,
+
+    // ── Online users ──────────────────────────────────────────────────────
+    pub online_users: Vec<(Uuid, String)>,
+
+    // ── Network ───────────────────────────────────────────────────────────
+    /// Send channel messages to the server connection task.
+    pub net_tx: mpsc::UnboundedSender<ClientMessage>,
+
+    /// Keystore for crypto operations.
+    pub keystore: Keystore,
+}
+
+impl App {
+    pub fn new(net_tx: mpsc::UnboundedSender<ClientMessage>, keystore: Keystore) -> Self {
+        Self {
+            view:        View::Login,
+            should_quit: false,
+
+            login_username: String::new(),
+            login_password: String::new(),
+            login_field:    LoginField::Username,
+            login_register: false,
+            status_msg:     None,
+
+            my_user_id:  None,
+            my_username: None,
+
+            channels:         Vec::new(),
+            selected_channel: 0,
+            channel_messages: HashMap::new(),
+
+            dm_peer_id:   None,
+            dm_peer_name: None,
+            dm_messages:  HashMap::new(),
+
+            input: String::new(),
+
+            online_users: Vec::new(),
+
+            net_tx,
+            keystore,
+        }
+    }
+
+    // ── Network message handling ──────────────────────────────────────────
+
+    pub fn handle_server_message(&mut self, msg: ServerMessage) {
+        match msg {
+            ServerMessage::AuthSuccess { user_id, username, .. } => {
+                self.my_user_id  = Some(user_id);
+                self.my_username = Some(username.clone());
+                self.status_msg  = None;
+                self.view        = View::Channel;
+                self.status_msg  = Some(format!("Logged in as {}", username));
+            }
+
+            ServerMessage::AuthError { reason } => {
+                self.status_msg = Some(format!("Auth failed: {}", reason));
+            }
+
+            ServerMessage::ChannelMessage {
+                channel_id,
+                author_username,
+                content,
+                timestamp,
+                ..
+            } => {
+                let entry = self
+                    .channel_messages
+                    .entry(channel_id)
+                    .or_default();
+
+                entry.push_back(ChatMessage {
+                    author:    author_username,
+                    content,
+                    timestamp: timestamp.with_timezone(&Local).format("%H:%M").to_string(),
+                });
+                if entry.len() > MAX_MESSAGES {
+                    entry.pop_front();
+                }
+            }
+
+            ServerMessage::ChannelCreated { channel_id, name, .. } => {
+                if !self.channels.iter().any(|(id, _)| *id == channel_id) {
+                    self.channels.push((channel_id, name));
+                }
+            }
+
+            ServerMessage::ChannelDeleted { channel_id } => {
+                self.channels.retain(|(id, _)| *id != channel_id);
+                self.channel_messages.remove(&channel_id);
+            }
+
+            ServerMessage::DirectMessage {
+                sender_id,
+                sender_username,
+                ciphertext,
+                nonce,
+                timestamp,
+                ..
+            } => {
+                // Determine the peer UUID (the other party in the conversation).
+                let peer_id = if Some(sender_id) == self.my_user_id {
+                    self.dm_peer_id.unwrap_or(sender_id)
+                } else {
+                    sender_id
+                };
+
+                // Try to decrypt; fall back to a placeholder if the key is missing.
+                let plaintext = self.keystore
+                    .get_dm_key(&peer_id)
+                    .and_then(|key| {
+                        crate::crypto::dm::decrypt(key, &nonce, &ciphertext).ok()
+                    })
+                    .unwrap_or_else(|| "[encrypted]".into());
+
+                let entry = self.dm_messages.entry(peer_id).or_default();
+                entry.push_back(ChatMessage {
+                    author:    sender_username,
+                    content:   plaintext,
+                    timestamp: timestamp.with_timezone(&Local).format("%H:%M").to_string(),
+                });
+                if entry.len() > MAX_MESSAGES {
+                    entry.pop_front();
+                }
+            }
+
+            ServerMessage::DmKeyExchangeRequest {
+                initiator_id,
+                initiator_username,
+                sender_ephemeral_pubkey,
+            } => {
+                // Bob receives this — generate our ephemeral pair and respond.
+                let (secret, our_pubkey_b64) = crate::crypto::dm::generate_exchange();
+
+                // Derive the shared key now (Bob has both keys).
+                if let Ok(key) = crate::crypto::dm::complete_exchange(secret, &sender_ephemeral_pubkey) {
+                    self.keystore.cache_dm_key(initiator_id, key);
+                }
+
+                let _ = self.net_tx.send(ClientMessage::AcceptDmKeyExchange {
+                    initiator_id,
+                    recipient_ephemeral_pubkey: our_pubkey_b64,
+                });
+
+                self.status_msg = Some(format!("{} wants to DM you", initiator_username));
+            }
+
+            ServerMessage::DmKeyExchangeResponse {
+                recipient_id,
+                recipient_ephemeral_pubkey,
+                ..
+            } => {
+                // Alice receives this — complete the exchange.
+                if let Some(secret) = self.keystore.take_pending_ecdh(recipient_id) {
+                    if let Ok(key) =
+                        crate::crypto::dm::complete_exchange(secret, &recipient_ephemeral_pubkey)
+                    {
+                        self.keystore.cache_dm_key(recipient_id, key);
+                        self.status_msg = Some("DM key exchange complete — you can now send encrypted messages".into());
+                    }
+                }
+            }
+
+            ServerMessage::UserOnline { user_id, username } => {
+                if !self.online_users.iter().any(|(id, _)| *id == user_id) {
+                    self.online_users.push((user_id, username));
+                }
+            }
+
+            ServerMessage::UserOffline { user_id, .. } => {
+                self.online_users.retain(|(id, _)| *id != user_id);
+            }
+
+            ServerMessage::Error { code, message } => {
+                self.status_msg = Some(format!("Error {}: {}", code, message));
+            }
+
+            // Other messages (history, role events, etc.) are acknowledged but
+            // not yet wired into the TUI — they will be handled in future iterations.
+            _ => {}
+        }
+    }
+
+    // ── Input helpers ─────────────────────────────────────────────────────
+
+    /// Submit the current channel text input.
+    pub fn submit_channel_message(&mut self) {
+        let content = self.input.trim().to_string();
+        if content.is_empty() {
+            return;
+        }
+        if let Some((channel_id, _)) = self.channels.get(self.selected_channel) {
+            let _ = self.net_tx.send(ClientMessage::SendChannelMessage {
+                channel_id: *channel_id,
+                content,
+            });
+        }
+        self.input.clear();
+    }
+
+    /// Submit the current DM text input (encrypted).
+    pub fn submit_dm_message(&mut self) {
+        let content = self.input.trim().to_string();
+        if content.is_empty() {
+            return;
+        }
+        let Some(peer_id) = self.dm_peer_id else { return };
+
+        match self.keystore.get_dm_key(&peer_id) {
+            Some(key) => {
+                let key = *key;
+                match crate::crypto::dm::encrypt(&key, &content) {
+                    Ok((ciphertext, nonce)) => {
+                        let _ = self.net_tx.send(ClientMessage::SendDm {
+                            recipient_id: peer_id,
+                            ciphertext,
+                            nonce,
+                        });
+                    }
+                    Err(e) => {
+                        self.status_msg = Some(format!("Encryption error: {}", e));
+                    }
+                }
+            }
+            None => {
+                self.status_msg = Some(
+                    "No DM key — initiate key exchange with /dm @user first".into(),
+                );
+            }
+        }
+        self.input.clear();
+    }
+
+    /// Initiate a DM key exchange with a peer by their UUID.
+    pub fn initiate_dm(&mut self, peer_id: Uuid, peer_name: String) {
+        let (secret, our_pubkey_b64) = crate::crypto::dm::generate_exchange();
+        self.keystore.store_pending_ecdh(peer_id, secret);
+
+        let _ = self.net_tx.send(ClientMessage::InitDmKeyExchange {
+            recipient_id:           peer_id,
+            sender_ephemeral_pubkey: our_pubkey_b64,
+        });
+
+        self.dm_peer_id   = Some(peer_id);
+        self.dm_peer_name = Some(peer_name);
+        self.view         = View::Dm;
+        self.status_msg   = Some("Key exchange initiated — waiting for peer...".into());
+    }
+
+    /// Submit the login/register form.
+    pub fn submit_login(&mut self) {
+        let username = self.login_username.trim().to_string();
+        let password = self.login_password.trim().to_string();
+        if username.is_empty() || password.is_empty() {
+            self.status_msg = Some("Username and password are required".into());
+            return;
+        }
+
+        let identity_pubkey = self.keystore.identity_pubkey_b64();
+
+        let msg = if self.login_register {
+            ClientMessage::Register { username, password, identity_pubkey }
+        } else {
+            ClientMessage::Login { username, password, identity_pubkey }
+        };
+
+        let _ = self.net_tx.send(msg);
+        self.status_msg = Some("Connecting...".into());
+    }
+
+    /// Current channel (Uuid, name), if any channel is selected.
+    pub fn current_channel(&self) -> Option<&(Uuid, String)> {
+        self.channels.get(self.selected_channel)
+    }
+
+    /// Messages for the currently viewed channel.
+    pub fn current_channel_messages(&self) -> Option<&VecDeque<ChatMessage>> {
+        self.current_channel()
+            .and_then(|(id, _)| self.channel_messages.get(id))
+    }
+
+    /// Messages for the current DM peer.
+    pub fn current_dm_messages(&self) -> Option<&VecDeque<ChatMessage>> {
+        self.dm_peer_id
+            .and_then(|id| self.dm_messages.get(&id))
+    }
+}
diff --git a/backchannel-client/src/tui/events.rs b/backchannel-client/src/tui/events.rs
new file mode 100644
index 0000000..430f9bf
--- /dev/null
+++ b/backchannel-client/src/tui/events.rs
@@ -0,0 +1,116 @@
+use anyhow::Result;
+use crossterm::event::{self, Event, KeyCode, KeyModifiers};
+use ratatui::{backend::CrosstermBackend, Terminal};
+use std::io::Stdout;
+use std::time::Duration;
+
+use crate::tui::app::{App, LoginField, View};
+
+/// The main event loop. Runs until `app.should_quit` is set.
+///
+/// Every ~50 ms we:
+/// 1. Drain any pending server messages from `server_rx`.
+/// 2. Poll for a crossterm keyboard event.
+/// 3. Redraw the terminal.
+pub async fn run(
+    app: &mut App,
+    terminal: &mut Terminal<CrosstermBackend<Stdout>>,
+    server_rx: &mut tokio::sync::mpsc::UnboundedReceiver<backchannel_common::protocol::ServerMessage>,
+) -> Result<()> {
+    loop {
+        // Drain server messages (non-blocking).
+        while let Ok(msg) = server_rx.try_recv() {
+            app.handle_server_message(msg);
+        }
+
+        // Draw.
+        terminal.draw(|f| crate::tui::views::draw(f, app))?;
+
+        // Poll keyboard events with a short timeout so server messages stay responsive.
+        if event::poll(Duration::from_millis(50))? {
+            if let Event::Key(key) = event::read()? {
+                handle_key(app, key.code, key.modifiers);
+            }
+        }
+
+        if app.should_quit {
+            break;
+        }
+    }
+    Ok(())
+}
+
+fn handle_key(app: &mut App, code: KeyCode, modifiers: KeyModifiers) {
+    // Ctrl-C or Ctrl-Q always quit.
+    if modifiers.contains(KeyModifiers::CONTROL)
+        && (code == KeyCode::Char('c') || code == KeyCode::Char('q'))
+    {
+        app.should_quit = true;
+        return;
+    }
+
+    match app.view {
+        View::Login  => handle_login_key(app, code),
+        View::Channel => handle_channel_key(app, code),
+        View::Dm     => handle_dm_key(app, code),
+    }
+}
+
+fn handle_login_key(app: &mut App, code: KeyCode) {
+    match code {
+        KeyCode::Tab => {
+            app.login_field = match app.login_field {
+                LoginField::Username => LoginField::Password,
+                LoginField::Password => LoginField::Username,
+            };
+        }
+        KeyCode::Enter => app.submit_login(),
+        KeyCode::Char('t') if app.login_username.is_empty() && app.login_password.is_empty() => {
+            // Toggle register/login mode only when both fields are empty
+            app.login_register = !app.login_register;
+        }
+        KeyCode::Char(c) => match app.login_field {
+            LoginField::Username => app.login_username.push(c),
+            LoginField::Password => app.login_password.push(c),
+        },
+        KeyCode::Backspace => match app.login_field {
+            LoginField::Username => { app.login_username.pop(); }
+            LoginField::Password => { app.login_password.pop(); }
+        },
+        _ => {}
+    }
+}
+
+fn handle_channel_key(app: &mut App, code: KeyCode) {
+    match code {
+        KeyCode::Enter => app.submit_channel_message(),
+        KeyCode::Char(c) => app.input.push(c),
+        KeyCode::Backspace => { app.input.pop(); }
+        // Channel navigation
+        KeyCode::Up => {
+            if app.selected_channel > 0 {
+                app.selected_channel -= 1;
+            }
+        }
+        KeyCode::Down => {
+            if app.selected_channel + 1 < app.channels.len() {
+                app.selected_channel += 1;
+            }
+        }
+        KeyCode::Esc => app.status_msg = None,
+        _ => {}
+    }
+}
+
+fn handle_dm_key(app: &mut App, code: KeyCode) {
+    match code {
+        KeyCode::Enter    => app.submit_dm_message(),
+        KeyCode::Char(c)  => app.input.push(c),
+        KeyCode::Backspace => { app.input.pop(); }
+        KeyCode::Esc      => {
+            app.view = View::Channel;
+            app.input.clear();
+        }
+        _ => {}
+    }
+}
diff --git a/backchannel-client/src/tui/mod.rs b/backchannel-client/src/tui/mod.rs
new file mode 100644
index 0000000..088a953
--- /dev/null
+++ b/backchannel-client/src/tui/mod.rs
@@ -0,0 +1,3 @@
+pub mod app;
+pub mod events;
+pub mod views;
diff --git a/backchannel-client/src/tui/views/channel.rs b/backchannel-client/src/tui/views/channel.rs
new file mode 100644
index 0000000..c77e6f0
--- /dev/null
+++ b/backchannel-client/src/tui/views/channel.rs
@@ -0,0 +1,147 @@
+use ratatui::{
+    layout::{Constraint, Direction, Layout},
+    style::{Color, Modifier, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, List, ListItem, ListState, Paragraph},
+    Frame,
+};
+
+use crate::tui::app::App;
+
+pub fn draw(frame: &mut Frame, app: &App) {
+    let area = frame.size();
+
+    // Split into sidebar | main column
+    let columns = Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([Constraint::Length(22), Constraint::Min(0)])
+        .split(area);
+
+    draw_sidebar(frame, app, columns[0]);
+    draw_main(frame, app, columns[1]);
+}
+
+fn draw_sidebar(frame: &mut Frame, app: &App, area: ratatui::layout::Rect) {
+    let rows = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([Constraint::Min(0), Constraint::Length(6)])
+        .split(area);
+
+    // ── Channel list ────────────────────────────────────────────────────
+    let items: Vec<ListItem> = app
+        .channels
+        .iter()
+        .enumerate()
+        .map(|(i, (_, name))| {
+            let style = if i == app.selected_channel {
+                Style::default().fg(Color::Yellow).add_modifier(Modifier::BOLD)
+            } else {
+                Style::default()
+            };
+            ListItem::new(format!("# {}", name)).style(style)
+        })
+        .collect();
+
+    let mut state = ListState::default();
+    state.select(Some(app.selected_channel));
+
+    let channels = List::new(items)
+        .block(
+            Block::default()
+                .title(" Channels ")
+                .borders(Borders::ALL)
+                .style(Style::default().fg(Color::Cyan)),
+        )
+        .highlight_style(Style::default().add_modifier(Modifier::BOLD));
+
+    frame.render_stateful_widget(channels, rows[0], &mut state);
+
+    // ── Online users ─────────────────────────────────────────────────────
+    let user_items: Vec<ListItem> = app
+        .online_users
+        .iter()
+        .map(|(_, name)| ListItem::new(format!("● {}", name)))
+        .collect();
+
+    let online = List::new(user_items).block(
+        Block::default()
+            .title(" Online ")
+            .borders(Borders::ALL)
+            .style(Style::default().fg(Color::Green)),
+    );
+    frame.render_widget(online, rows[1]);
+}
+
+fn draw_main(frame: &mut Frame, app: &App, area: ratatui::layout::Rect) {
+    let rows = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Length(1), // channel title bar
+            Constraint::Min(0),    // messages
+            Constraint::Length(3), // input box
+            Constraint::Length(1), // status bar
+        ])
+        .split(area);
+
+    // ── Title bar ────────────────────────────────────────────────────────
+    let title = app
+        .current_channel()
+        .map(|(_, name)| format!(" # {} ", name))
+        .unwrap_or_else(|| " No channel selected ".into());
+
+    let title_bar = Paragraph::new(title)
+        .style(Style::default().fg(Color::White).bg(Color::DarkGray).add_modifier(Modifier::BOLD));
+    frame.render_widget(title_bar, rows[0]);
+
+    // ── Messages ─────────────────────────────────────────────────────────
+    let msgs: Vec<ListItem> = app
+        .current_channel_messages()
+        .map(|deque| {
+            deque
+                .iter()
+                .map(|m| {
+                    ListItem::new(Line::from(vec![
+                        Span::styled(
+                            format!("{} ", m.timestamp),
+                            Style::default().fg(Color::DarkGray),
+                        ),
+                        Span::styled(
+                            format!("{}: ", m.author),
+                            Style::default().fg(Color::Cyan).add_modifier(Modifier::BOLD),
+                        ),
+                        Span::raw(m.content.clone()),
+                    ]))
+                })
+                .collect()
+        })
+        .unwrap_or_default();
+
+    let message_count = msgs.len();
+    let mut list_state = ListState::default();
+    if message_count > 0 {
+        list_state.select(Some(message_count - 1));
+    }
+
+    let messages = List::new(msgs)
+        .block(Block::default().borders(Borders::LEFT))
+        .highlight_style(Style::default());
+    frame.render_stateful_widget(messages, rows[1], &mut list_state);
+
+    // ── Input box ─────────────────────────────────────────────────────────
+    let input = Paragraph::new(app.input.as_str())
+        .block(
+            Block::default()
+                .borders(Borders::ALL)
+                .title(" Message (Enter to send) "),
+        );
+    frame.render_widget(input, rows[2]);
+
+    // ── Status bar ────────────────────────────────────────────────────────
+    let status_text = app
+        .status_msg
+        .as_deref()
+        .unwrap_or("Ctrl-Q: quit  |  ↑↓: channels  |  Esc: dismiss");
+    let status = Paragraph::new(status_text)
+        .style(Style::default().fg(Color::DarkGray));
+    frame.render_widget(status, rows[3]);
+}
diff --git a/backchannel-client/src/tui/views/dm.rs b/backchannel-client/src/tui/views/dm.rs
new file mode 100644
index 0000000..9af6f16
--- /dev/null
+++ b/backchannel-client/src/tui/views/dm.rs
@@ -0,0 +1,86 @@
+use ratatui::{
+    layout::{Constraint, Direction, Layout},
+    style::{Color, Modifier, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, List, ListItem, ListState, Paragraph},
+    Frame,
+};
+
+use crate::tui::app::App;
+
+pub fn draw(frame: &mut Frame, app: &App) {
+    let area = frame.size();
+
+    let rows = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Length(1), // title bar
+            Constraint::Min(0),    // messages
+            Constraint::Length(3), // input
+            Constraint::Length(1), // status
+        ])
+        .split(area);
+
+    // ── Title bar ─────────────────────────────────────────────────────────
+    let peer_name = app
+        .dm_peer_name
+        .as_deref()
+        .unwrap_or("Unknown");
+
+    let title = Paragraph::new(format!(" DM: {} (E2EE) ", peer_name))
+        .style(Style::default().fg(Color::White).bg(Color::Blue).add_modifier(Modifier::BOLD));
+    frame.render_widget(title, rows[0]);
+
+    // ── Messages ──────────────────────────────────────────────────────────
+    let msgs: Vec<ListItem> = app
+        .current_dm_messages()
+        .map(|deque| {
+            deque
+                .iter()
+                .map(|m| {
+                    let is_self = app.my_username.as_deref() == Some(m.author.as_str());
+                    let author_style = if is_self {
+                        Style::default().fg(Color::Green).add_modifier(Modifier::BOLD)
+                    } else {
+                        Style::default().fg(Color::Cyan).add_modifier(Modifier::BOLD)
+                    };
+                    ListItem::new(Line::from(vec![
+                        Span::styled(
+                            format!("{} ", m.timestamp),
+                            Style::default().fg(Color::DarkGray),
+                        ),
+                        Span::styled(format!("{}: ", m.author), author_style),
+                        Span::raw(m.content.clone()),
+                    ]))
+                })
+                .collect()
+        })
+        .unwrap_or_default();
+
+    let msg_count = msgs.len();
+    let mut state = ListState::default();
+    if msg_count > 0 {
+        state.select(Some(msg_count - 1));
+    }
+
+    let messages = List::new(msgs).block(Block::default().borders(Borders::LEFT));
+    frame.render_stateful_widget(messages, rows[1], &mut state);
+
+    // ── Input box ─────────────────────────────────────────────────────────
+    let input = Paragraph::new(app.input.as_str())
+        .block(
+            Block::default()
+                .borders(Borders::ALL)
+                .title(" Encrypted message (Enter: send  Esc: back) "),
+        );
+    frame.render_widget(input, rows[2]);
+
+    // ── Status bar ────────────────────────────────────────────────────────
+    let status_text = app
+        .status_msg
+        .as_deref()
+        .unwrap_or("🔒 End-to-end encrypted");
+    let status = Paragraph::new(status_text)
+        .style(Style::default().fg(Color::DarkGray));
+    frame.render_widget(status, rows[3]);
+}
diff --git a/backchannel-client/src/tui/views/login.rs b/backchannel-client/src/tui/views/login.rs
new file mode 100644
index 0000000..e3a2626
--- /dev/null
+++ b/backchannel-client/src/tui/views/login.rs
@@ -0,0 +1,98 @@
+use ratatui::{
+    layout::{Alignment, Constraint, Direction, Layout},
+    style::{Color, Modifier, Style},
+    text::{Line, Span},
+    widgets::{Block, Borders, Paragraph},
+    Frame,
+};
+
+use crate::tui::app::{App, LoginField};
+
+pub fn draw(frame: &mut Frame, app: &App) {
+    let area = frame.size();
+
+    // Centre a 50×12 box on screen.
+    let v = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Percentage(30),
+            Constraint::Length(14),
+            Constraint::Min(0),
+        ])
+        .split(area);
+
+    let h = Layout::default()
+        .direction(Direction::Horizontal)
+        .constraints([
+            Constraint::Percentage(25),
+            Constraint::Percentage(50),
+            Constraint::Percentage(25),
+        ])
+        .split(v[1]);
+
+    let box_area = h[1];
+
+    let mode_label = if app.login_register { "Register" } else { "Login" };
+
+    let outer = Block::default()
+        .title(format!(" BackChannel — {} ", mode_label))
+        .borders(Borders::ALL)
+        .style(Style::default().fg(Color::Cyan));
+
+    frame.render_widget(outer, box_area);
+
+    let inner = Layout::default()
+        .direction(Direction::Vertical)
+        .constraints([
+            Constraint::Length(1), // padding
+            Constraint::Length(3), // username
+            Constraint::Length(3), // password
+            Constraint::Length(1), // padding
+            Constraint::Length(1), // hint
+            Constraint::Length(1), // status
+        ])
+        .margin(1)
+        .split(box_area);
+
+    // Username field
+    let username_style = if app.login_field == LoginField::Username {
+        Style::default().fg(Color::Yellow).add_modifier(Modifier::BOLD)
+    } else {
+        Style::default()
+    };
+    let username_widget = Paragraph::new(app.login_username.as_str())
+        .block(Block::default().borders(Borders::ALL).title(" Username "))
+        .style(username_style);
+    frame.render_widget(username_widget, inner[1]);
+
+    // Password field (mask with asterisks)
+    let password_style = if app.login_field == LoginField::Password {
+        Style::default().fg(Color::Yellow).add_modifier(Modifier::BOLD)
+    } else {
+        Style::default()
+    };
+    let masked: String = "*".repeat(app.login_password.len());
+    let password_widget = Paragraph::new(masked.as_str())
+        .block(Block::default().borders(Borders::ALL).title(" Password "))
+        .style(password_style);
+    frame.render_widget(password_widget, inner[2]);
+
+    // Hints
+    let hint = Paragraph::new(Line::from(vec![
+        Span::raw("Tab: switch field  |  Enter: submit  |  "),
+        Span::styled(
+            if app.login_register { "T: switch to Login" } else { "T: switch to Register" },
+            Style::default().fg(Color::DarkGray),
+        ),
+    ]))
+    .alignment(Alignment::Center);
+    frame.render_widget(hint, inner[4]);
+
+    // Status / error message
+    if let Some(msg) = &app.status_msg {
+        let status = Paragraph::new(msg.as_str())
+            .style(Style::default().fg(Color::Red))
+            .alignment(Alignment::Center);
+        frame.render_widget(status, inner[5]);
+    }
+}
diff --git a/backchannel-client/src/tui/views/mod.rs b/backchannel-client/src/tui/views/mod.rs
new file mode 100644
index 0000000..26dc36d
--- /dev/null
+++ b/backchannel-client/src/tui/views/mod.rs
@@ -0,0 +1,16 @@
+pub mod channel;
+pub mod dm;
+pub mod login;
+
+use ratatui::Frame;
+
+use crate::tui::app::{App, View};
+
+/// Top-level draw dispatcher — renders the correct view based on `app.view`.
+pub fn draw(frame: &mut Frame, app: &App) {
+    match app.view {
+        View::Login   => login::draw(frame, app),
+        View::Channel => channel::draw(frame, app),
+        View::Dm      => dm::draw(frame, app),
+    }
+}
diff --git a/backchannel-common/Cargo.toml b/backchannel-common/Cargo.toml
new file mode 100644
index 0000000..64630f8
--- /dev/null
+++ b/backchannel-common/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name    = "backchannel-common"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde            = { workspace = true }
+serde_json       = { workspace = true }
+uuid             = { workspace = true }
+chrono           = { workspace = true }
+thiserror        = { workspace = true }
+base64           = { workspace = true }
+rand             = { workspace = true }
+ed25519-dalek    = { workspace = true }
+x25519-dalek     = { workspace = true }
+chacha20poly1305 = { workspace = true }
+hkdf             = { workspace = true }
+sha2             = { workspace = true }
diff --git a/backchannel-common/src/crypto/aead.rs b/backchannel-common/src/crypto/aead.rs
new file mode 100644
index 0000000..853a753
--- /dev/null
+++ b/backchannel-common/src/crypto/aead.rs
@@ -0,0 +1,59 @@
+use base64::{engine::general_purpose::STANDARD as B64, Engine};
+use chacha20poly1305::{
+    aead::{Aead, KeyInit},
+    ChaCha20Poly1305, Key, Nonce,
+};
+use hkdf::Hkdf;
+use rand::RngCore;
+use rand::rngs::OsRng;
+use sha2::Sha256;
+
+use crate::error::{BackchannelError, Result};
+
+const HKDF_INFO: &[u8] = b"backchannel-dm-v1";
+const HKDF_SALT: &[u8] = b"backchannel-salt-v1";
+
+/// Derive a 32-byte ChaCha20-Poly1305 key from a raw X25519 shared secret
+/// using HKDF-SHA256. The raw DH output should never be used directly.
+pub fn derive_dm_key(raw_secret: &[u8]) -> [u8; 32] {
+    let hk = Hkdf::<Sha256>::new(Some(HKDF_SALT), raw_secret);
+    let mut okm = [0u8; 32];
+    hk.expand(HKDF_INFO, &mut okm)
+        .expect("32-byte output always fits HKDF-SHA256");
+    okm
+}
+
+/// Encrypt `plaintext` with a 32-byte key.
+///
+/// Returns `(ciphertext_b64, nonce_b64)`. A fresh random nonce is generated
+/// for every call — callers must transmit both values to the recipient.
+pub fn encrypt(key_bytes: &[u8; 32], plaintext: &[u8]) -> Result<(String, String)> {
+    let key = Key::from_slice(key_bytes);
+    let cipher = ChaCha20Poly1305::new(key);
+
+    let mut nonce_bytes = [0u8; 12];
+    OsRng.fill_bytes(&mut nonce_bytes);
+    let nonce = Nonce::from(nonce_bytes);
+
+    let ciphertext = cipher
+        .encrypt(&nonce, plaintext)
+        .map_err(|_| BackchannelError::Crypto("encryption failed".into()))?;
+
+    Ok((B64.encode(&ciphertext), B64.encode(nonce_bytes)))
+}
+
+/// Decrypt `ciphertext_b64` using `key_bytes` and `nonce_b64`.
+pub fn decrypt(key_bytes: &[u8; 32], nonce_b64: &str, ciphertext_b64: &str) -> Result<Vec<u8>> {
+    let key = Key::from_slice(key_bytes);
+    let cipher = ChaCha20Poly1305::new(key);
+
+    let nonce_bytes = B64.decode(nonce_b64)?;
+    let nonce_arr: [u8; 12] = nonce_bytes
+        .try_into()
+        .map_err(|_| BackchannelError::InvalidKeyLength)?;
+    let nonce = Nonce::from(nonce_arr);
+
+    let ciphertext = B64.decode(ciphertext_b64)?;
+    let plaintext = cipher.decrypt(&nonce, ciphertext.as_ref())?;
+    Ok(plaintext)
+}
diff --git a/backchannel-common/src/crypto/ecdh.rs b/backchannel-common/src/crypto/ecdh.rs
new file mode 100644
index 0000000..9bb96e4
--- /dev/null
+++ b/backchannel-common/src/crypto/ecdh.rs
@@ -0,0 +1,37 @@
+use base64::{engine::general_purpose::STANDARD as B64, Engine};
+use rand::rngs::OsRng;
+use x25519_dalek::{EphemeralSecret, PublicKey};
+
+use crate::error::{BackchannelError, Result};
+
+/// Generate an X25519 ephemeral keypair for one DM key exchange.
+///
+/// The `EphemeralSecret` is consumed by `diffie_hellman`, ensuring it cannot
+/// be reused. Call `derive_dm_key` (in `aead`) on the resulting shared secret.
+pub fn generate_ephemeral() -> (EphemeralSecret, PublicKey) {
+    let secret = EphemeralSecret::random_from_rng(OsRng);
+    let public = PublicKey::from(&secret);
+    (secret, public)
+}
+
+/// Encode an X25519 public key to base64.
+pub fn pubkey_to_b64(key: &PublicKey) -> String {
+    B64.encode(key.as_bytes())
+}
+
+/// Decode a base64 string to an X25519 public key.
+pub fn b64_to_pubkey(s: &str) -> Result<PublicKey> {
+    let bytes = B64.decode(s)?;
+    let arr: [u8; 32] = bytes
+        .try_into()
+        .map_err(|_| BackchannelError::InvalidKeyLength)?;
+    Ok(PublicKey::from(arr))
+}
+
+/// Perform X25519 Diffie-Hellman and return the 32-byte shared secret.
+///
+/// `secret` is consumed (ephemeral), preventing reuse.
+pub fn diffie_hellman(secret: EphemeralSecret, their_pubkey: &PublicKey) -> [u8; 32] {
+    let shared = secret.diffie_hellman(their_pubkey);
+    *shared.as_bytes()
+}
diff --git a/backchannel-common/src/crypto/identity.rs b/backchannel-common/src/crypto/identity.rs
new file mode 100644
index 0000000..447bc8f
--- /dev/null
+++ b/backchannel-common/src/crypto/identity.rs
@@ -0,0 +1,67 @@
+use base64::{engine::general_purpose::STANDARD as B64, Engine};
+use ed25519_dalek::{Signature, SigningKey, VerifyingKey};
+use rand::rngs::OsRng;
+
+use crate::error::{BackchannelError, Result};
+
+/// Generate a new Ed25519 identity keypair.
+pub fn generate_keypair() -> (SigningKey, VerifyingKey) {
+    let signing_key = SigningKey::generate(&mut OsRng);
+    let verifying_key = signing_key.verifying_key();
+    (signing_key, verifying_key)
+}
+
+/// Encode an Ed25519 public key to a base64 string (32 bytes → ~44 chars).
+pub fn pubkey_to_b64(key: &VerifyingKey) -> String {
+    B64.encode(key.as_bytes())
+}
+
+/// Decode a base64 string back to an Ed25519 public key.
+pub fn b64_to_pubkey(s: &str) -> Result<VerifyingKey> {
+    let bytes = B64.decode(s)?;
+    let arr: [u8; 32] = bytes
+        .try_into()
+        .map_err(|_| BackchannelError::InvalidKeyLength)?;
+    VerifyingKey::from_bytes(&arr).map_err(|e| BackchannelError::Crypto(e.to_string()))
+}
+
+/// Encode a signing key (private key bytes) to base64 for keystore persistence.
+pub fn signing_key_to_b64(key: &SigningKey) -> String {
+    B64.encode(key.to_bytes())
+}
+
+/// Decode a base64 string back to a signing key.
+pub fn b64_to_signing_key(s: &str) -> Result<SigningKey> {
+    let bytes = B64.decode(s)?;
+    let arr: [u8; 32] = bytes
+        .try_into()
+        .map_err(|_| BackchannelError::InvalidKeyLength)?;
+    Ok(SigningKey::from_bytes(&arr))
+}
+
+/// Sign a message with an Ed25519 signing key.
+pub fn sign(key: &SigningKey, message: &[u8]) -> Signature {
+    use ed25519_dalek::Signer;
+    key.sign(message)
+}
+
+/// Verify an Ed25519 signature.
+pub fn verify(key: &VerifyingKey, message: &[u8], sig: &Signature) -> Result<()> {
+    use ed25519_dalek::Verifier;
+    key.verify(message, sig)?;
+    Ok(())
+}
+
+/// Encode a `Signature` to base64.
+pub fn sig_to_b64(sig: &Signature) -> String {
+    B64.encode(sig.to_bytes())
+}
+
+/// Decode a base64 string back to a `Signature`.
+pub fn b64_to_sig(s: &str) -> Result<Signature> {
+    let bytes = B64.decode(s)?;
+    let arr: [u8; 64] = bytes
+        .try_into()
+        .map_err(|_| BackchannelError::InvalidKeyLength)?;
+    Ok(Signature::from_bytes(&arr))
+}
diff --git a/backchannel-common/src/crypto/mod.rs b/backchannel-common/src/crypto/mod.rs
new file mode 100644
index 0000000..c0fab9c
--- /dev/null
+++ b/backchannel-common/src/crypto/mod.rs
@@ -0,0 +1,3 @@
+pub mod aead;
+pub mod ecdh;
+pub mod identity;
diff --git a/backchannel-common/src/error.rs b/backchannel-common/src/error.rs
new file mode 100644
index 0000000..0e415c9
--- /dev/null
+++ b/backchannel-common/src/error.rs
@@ -0,0 +1,39 @@
+use thiserror::Error;
+
+pub type Result<T> = std::result::Result<T, BackchannelError>;
+
+#[derive(Debug, Error)]
+pub enum BackchannelError {
+    #[error("cryptographic error: {0}")]
+    Crypto(String),
+
+    #[error("base64 decode error: {0}")]
+    Base64(#[from] base64::DecodeError),
+
+    #[error("serialization error: {0}")]
+    Serialization(#[from] serde_json::Error),
+
+    #[error("invalid key length")]
+    InvalidKeyLength,
+
+    #[error("decryption failed: authentication tag mismatch")]
+    DecryptionFailed,
+
+    #[error("signature verification failed")]
+    InvalidSignature,
+
+    #[error("{0}")]
+    Other(String),
+}
+
+impl From<chacha20poly1305::Error> for BackchannelError {
+    fn from(_: chacha20poly1305::Error) -> Self {
+        BackchannelError::DecryptionFailed
+    }
+}
+
+impl From<ed25519_dalek::SignatureError> for BackchannelError {
+    fn from(_: ed25519_dalek::SignatureError) -> Self {
+        BackchannelError::InvalidSignature
+    }
+}
diff --git a/backchannel-common/src/lib.rs b/backchannel-common/src/lib.rs
new file mode 100644
index 0000000..a580d8f
--- /dev/null
+++ b/backchannel-common/src/lib.rs
@@ -0,0 +1,6 @@
+pub mod crypto;
+pub mod error;
+pub mod protocol;
+pub mod types;
+
+pub use error::{BackchannelError, Result};
diff --git a/backchannel-common/src/protocol/client.rs b/backchannel-common/src/protocol/client.rs
new file mode 100644
index 0000000..6d81aad
--- /dev/null
+++ b/backchannel-common/src/protocol/client.rs
@@ -0,0 +1,121 @@
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// Every message the client can send to the server over the WebSocket.
+///
+/// Serialised as JSON with an inline `"type"` discriminant, e.g.:
+/// `{"type":"login","username":"alice","password":"...","identity_pubkey":"..."}`
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum ClientMessage {
+    // ── Authentication ────────────────────────────────────────────────────
+    /// First-time authentication with credentials.
+    Login {
+        username: String,
+        /// Sent in plaintext; the TLS layer protects this in transit.
+        password: String,
+        /// Base64-encoded Ed25519 public key (32 bytes).
+        /// Stored/updated server-side as the user's cryptographic identity.
+        identity_pubkey: String,
+    },
+
+    /// Register a new account.
+    Register {
+        username: String,
+        password: String,
+        identity_pubkey: String,
+    },
+
+    /// Re-establish an authenticated session using a previously issued JWT.
+    /// Avoids re-entering the password on reconnect.
+    ResumeSession {
+        token: String,
+    },
+
+    /// Gracefully end the session; server invalidates the JWT.
+    Logout,
+
+    // ── Channel messaging ─────────────────────────────────────────────────
+    /// Post a plaintext message to a channel.
+    SendChannelMessage {
+        channel_id: Uuid,
+        content: String,
+    },
+
+    /// Request recent message history for a channel.
+    FetchChannelHistory {
+        channel_id: Uuid,
+        /// Pagination: fetch messages older than this ID.
+        before_message_id: Option<Uuid>,
+        limit: u32,
+    },
+
+    // ── Direct messages (E2EE) ────────────────────────────────────────────
+    /// Phase 1 of DM key exchange: initiator sends their X25519 ephemeral
+    /// public key to the server, addressed to the target recipient.
+    InitDmKeyExchange {
+        recipient_id: Uuid,
+        /// Base64-encoded X25519 ephemeral public key (32 bytes).
+        sender_ephemeral_pubkey: String,
+    },
+
+    /// Phase 2 of DM key exchange: recipient responds with their ephemeral
+    /// public key. Both sides can now derive the same shared secret.
+    AcceptDmKeyExchange {
+        initiator_id: Uuid,
+        /// Base64-encoded X25519 ephemeral public key (32 bytes).
+        recipient_ephemeral_pubkey: String,
+    },
+
+    /// Send an E2EE DM. The server relays the ciphertext without decrypting.
+    SendDm {
+        recipient_id: Uuid,
+        /// Base64-encoded ChaCha20-Poly1305 ciphertext.
+        ciphertext: String,
+        /// Base64-encoded nonce (12 bytes).
+        nonce: String,
+    },
+
+    /// Request DM history with a specific peer.
+    FetchDmHistory {
+        peer_id: Uuid,
+        before_message_id: Option<Uuid>,
+        limit: u32,
+    },
+
+    // ── Channel management ────────────────────────────────────────────────
+    CreateChannel {
+        name: String,
+        topic: Option<String>,
+    },
+
+    DeleteChannel {
+        channel_id: Uuid,
+    },
+
+    // ── Role & permission management ──────────────────────────────────────
+    CreateRole {
+        name: String,
+        /// Permission bitmask; see `PermissionFlags` in `types.rs`.
+        permissions: u64,
+    },
+
+    AssignRole {
+        user_id: Uuid,
+        role_id: Uuid,
+    },
+
+    RevokeRole {
+        user_id: Uuid,
+        role_id: Uuid,
+    },
+
+    // ── Key directory ─────────────────────────────────────────────────────
+    /// Look up another user's registered Ed25519 identity public key.
+    QueryIdentityKey {
+        user_id: Uuid,
+    },
+
+    // ── Keepalive ─────────────────────────────────────────────────────────
+    Ping,
+}
diff --git a/backchannel-common/src/protocol/mod.rs b/backchannel-common/src/protocol/mod.rs
new file mode 100644
index 0000000..5688bb2
--- /dev/null
+++ b/backchannel-common/src/protocol/mod.rs
@@ -0,0 +1,5 @@
+pub mod client;
+pub mod server;
+
+pub use client::ClientMessage;
+pub use server::{HistoricChannelMessage, HistoricDm, ServerMessage};
diff --git a/backchannel-common/src/protocol/server.rs b/backchannel-common/src/protocol/server.rs
new file mode 100644
index 0000000..49c4260
--- /dev/null
+++ b/backchannel-common/src/protocol/server.rs
@@ -0,0 +1,141 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+/// Every message the server can push to a client over the WebSocket.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "type", rename_all = "snake_case")]
+pub enum ServerMessage {
+    // ── Auth responses ────────────────────────────────────────────────────
+    AuthSuccess {
+        user_id: Uuid,
+        username: String,
+        /// Signed JWT. Client stores this for reconnect via `ResumeSession`.
+        session_token: String,
+    },
+
+    AuthError {
+        reason: String,
+    },
+
+    // ── Channel events ────────────────────────────────────────────────────
+    /// Broadcast to all connected clients when a channel message is posted.
+    ChannelMessage {
+        message_id: Uuid,
+        channel_id: Uuid,
+        author_id: Uuid,
+        author_username: String,
+        content: String,
+        timestamp: DateTime<Utc>,
+    },
+
+    /// Response to `FetchChannelHistory`.
+    ChannelHistory {
+        channel_id: Uuid,
+        messages: Vec<HistoricChannelMessage>,
+    },
+
+    ChannelCreated {
+        channel_id: Uuid,
+        name: String,
+        topic: Option<String>,
+    },
+
+    ChannelDeleted {
+        channel_id: Uuid,
+    },
+
+    // ── DM key exchange relay ─────────────────────────────────────────────
+    /// Server relays the initiator's ephemeral pubkey to the recipient.
+    DmKeyExchangeRequest {
+        initiator_id: Uuid,
+        initiator_username: String,
+        sender_ephemeral_pubkey: String,
+    },
+
+    /// Server relays the recipient's ephemeral pubkey back to the initiator.
+    DmKeyExchangeResponse {
+        recipient_id: Uuid,
+        recipient_username: String,
+        recipient_ephemeral_pubkey: String,
+    },
+
+    // ── DM messages ───────────────────────────────────────────────────────
+    /// Relayed E2EE DM. Server cannot read `ciphertext`.
+    DirectMessage {
+        message_id: Uuid,
+        sender_id: Uuid,
+        sender_username: String,
+        ciphertext: String,
+        nonce: String,
+        timestamp: DateTime<Utc>,
+    },
+
+    DmHistory {
+        peer_id: Uuid,
+        messages: Vec<HistoricDm>,
+    },
+
+    // ── Presence ──────────────────────────────────────────────────────────
+    Pong,
+
+    UserOnline {
+        user_id: Uuid,
+        username: String,
+    },
+
+    UserOffline {
+        user_id: Uuid,
+        username: String,
+    },
+
+    // ── Role events ───────────────────────────────────────────────────────
+    RoleCreated {
+        role_id: Uuid,
+        name: String,
+        permissions: u64,
+    },
+
+    RoleAssigned {
+        user_id: Uuid,
+        role_id: Uuid,
+    },
+
+    RoleRevoked {
+        user_id: Uuid,
+        role_id: Uuid,
+    },
+
+    // ── Key directory ─────────────────────────────────────────────────────
+    IdentityKeyResponse {
+        user_id: Uuid,
+        /// Base64-encoded Ed25519 public key, or null if unknown.
+        identity_pubkey: Option<String>,
+    },
+
+    // ── Generic error ─────────────────────────────────────────────────────
+    Error {
+        code: u16,
+        message: String,
+    },
+}
+
+/// A channel message returned in history responses.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct HistoricChannelMessage {
+    pub message_id: Uuid,
+    pub author_id: Uuid,
+    pub author_username: String,
+    pub content: String,
+    pub timestamp: DateTime<Utc>,
+}
+
+/// A DM returned in history responses. Ciphertext is opaque to the server.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct HistoricDm {
+    pub message_id: Uuid,
+    pub sender_id: Uuid,
+    pub ciphertext: String,
+    pub nonce: String,
+    pub timestamp: DateTime<Utc>,
+}
diff --git a/backchannel-common/src/types.rs b/backchannel-common/src/types.rs
new file mode 100644
index 0000000..3a66b09
--- /dev/null
+++ b/backchannel-common/src/types.rs
@@ -0,0 +1,72 @@
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+// Typed UUID wrappers to prevent accidental mixing of IDs.
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub struct UserId(pub Uuid);
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub struct ChannelId(pub Uuid);
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub struct MessageId(pub Uuid);
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+pub struct RoleId(pub Uuid);
+
+impl UserId {
+    pub fn new() -> Self {
+        Self(Uuid::new_v4())
+    }
+    pub fn inner(self) -> Uuid {
+        self.0
+    }
+}
+
+impl ChannelId {
+    pub fn new() -> Self {
+        Self(Uuid::new_v4())
+    }
+    pub fn inner(self) -> Uuid {
+        self.0
+    }
+}
+
+impl MessageId {
+    pub fn new() -> Self {
+        Self(Uuid::new_v4())
+    }
+    pub fn inner(self) -> Uuid {
+        self.0
+    }
+}
+
+impl RoleId {
+    pub fn new() -> Self {
+        Self(Uuid::new_v4())
+    }
+    pub fn inner(self) -> Uuid {
+        self.0
+    }
+}
+
+/// Permission bit-flags for server roles.
+/// The `ADMINISTRATOR` flag bypasses all individual permission checks.
+pub struct PermissionFlags;
+
+impl PermissionFlags {
+    pub const READ_MESSAGES: u64 = 1 << 0;
+    pub const SEND_MESSAGES: u64 = 1 << 1;
+    pub const MANAGE_CHANNELS: u64 = 1 << 2;
+    pub const MANAGE_ROLES: u64 = 1 << 3;
+    pub const KICK_MEMBERS: u64 = 1 << 4;
+    pub const BAN_MEMBERS: u64 = 1 << 5;
+    /// Bypasses all permission checks.
+    pub const ADMINISTRATOR: u64 = 1 << 63;
+}
+
+/// Check whether `perms` satisfies a required flag, honoring ADMINISTRATOR.
+pub fn has_permission(perms: u64, required: u64) -> bool {
+    (perms & PermissionFlags::ADMINISTRATOR) != 0 || (perms & required) == required
+}
diff --git a/backchannel-server/Cargo.toml b/backchannel-server/Cargo.toml
new file mode 100644
index 0000000..a5296a3
--- /dev/null
+++ b/backchannel-server/Cargo.toml
@@ -0,0 +1,36 @@
+[package]
+name    = "backchannel-server"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "backchannel-server"
+path = "src/main.rs"
+
+[dependencies]
+backchannel-common = { path = "../backchannel-common" }
+
+serde            = { workspace = true }
+serde_json       = { workspace = true }
+uuid             = { workspace = true }
+chrono           = { workspace = true }
+thiserror        = { workspace = true }
+anyhow           = { workspace = true }
+tracing          = { workspace = true }
+tracing-subscriber = { workspace = true }
+base64           = { workspace = true }
+rand             = { workspace = true }
+argon2           = { workspace = true }
+ed25519-dalek    = { workspace = true }
+tokio            = { workspace = true }
+tokio-tungstenite = { workspace = true }
+
+sqlx         = { version = "0.8", features = ["sqlite", "runtime-tokio-rustls", "macros", "migrate", "chrono", "uuid"] }
+jsonwebtoken = "9"
+rustls         = { version = "0.23", features = ["ring"] }
+rustls-pemfile = "2"
+tokio-rustls   = "0.26"
+futures-util   = "0.3"
+axum           = "0.7"
+rust-embed     = "8"
+mime_guess     = "2"
diff --git a/backchannel-server/src/auth/mod.rs b/backchannel-server/src/auth/mod.rs
new file mode 100644
index 0000000..f87b187
--- /dev/null
+++ b/backchannel-server/src/auth/mod.rs
@@ -0,0 +1,2 @@
+pub mod password;
+pub mod token;
diff --git a/backchannel-server/src/auth/password.rs b/backchannel-server/src/auth/password.rs
new file mode 100644
index 0000000..3af6635
--- /dev/null
+++ b/backchannel-server/src/auth/password.rs
@@ -0,0 +1,31 @@
+use argon2::{
+    password_hash::{rand_core::OsRng, PasswordHash, PasswordHasher, PasswordVerifier, SaltString},
+    Argon2,
+};
+
+use crate::error::{Result, ServerError};
+
+/// Hash a plaintext password using Argon2id.
+///
+/// The returned string is the PHC-format encoded hash, suitable for storage in
+/// the `users.password_hash` column. Includes the salt, so no separate salt
+/// storage is needed.
+pub fn hash(password: &str) -> Result<String> {
+    let salt = SaltString::generate(&mut OsRng);
+    let hash = Argon2::default()
+        .hash_password(password.as_bytes(), &salt)?
+        .to_string();
+    Ok(hash)
+}
+
+/// Verify a plaintext password against a stored PHC-format hash.
+///
+/// Returns `Ok(())` on success, `Err(ServerError::Unauthorized)` on mismatch.
+pub fn verify(password: &str, stored_hash: &str) -> Result<()> {
+    let parsed = PasswordHash::new(stored_hash)
+        .map_err(|e| ServerError::PasswordHash(e.to_string()))?;
+
+    Argon2::default()
+        .verify_password(password.as_bytes(), &parsed)
+        .map_err(|_| ServerError::Unauthorized)
+}
diff --git a/backchannel-server/src/auth/token.rs b/backchannel-server/src/auth/token.rs
new file mode 100644
index 0000000..99a68f8
--- /dev/null
+++ b/backchannel-server/src/auth/token.rs
@@ -0,0 +1,110 @@
+use chrono::Utc;
+use jsonwebtoken::{decode, encode, Algorithm, DecodingKey, EncodingKey, Header, Validation};
+use serde::{Deserialize, Serialize};
+use sqlx::SqlitePool;
+use uuid::Uuid;
+
+use crate::error::{Result, ServerError};
+
+/// Claims embedded in every BackChannel JWT.
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct Claims {
+    /// Subject: user UUID as a string.
+    pub sub: String,
+    pub username: String,
+    /// JWT ID — stored in the `sessions` table for revocation support.
+    pub jti: String,
+    /// Issued-at (Unix seconds).
+    pub iat: i64,
+    /// Expiry (Unix seconds).
+    pub exp: i64,
+}
+
+impl Claims {
+    pub fn user_id(&self) -> Result<Uuid> {
+        Uuid::parse_str(&self.sub).map_err(|e| ServerError::Internal(e.to_string()))
+    }
+}
+
+const TOKEN_TTL_SECS: i64 = 7 * 24 * 3600; // 7 days
+
+/// Issue a signed JWT and persist its JTI in the `sessions` table.
+pub async fn issue(
+    pool: &SqlitePool,
+    user_id: Uuid,
+    username: &str,
+    secret: &[u8],
+) -> Result<String> {
+    let now = Utc::now().timestamp();
+    let jti = Uuid::new_v4().to_string();
+
+    let claims = Claims {
+        sub: user_id.to_string(),
+        username: username.to_string(),
+        jti: jti.clone(),
+        iat: now,
+        exp: now + TOKEN_TTL_SECS,
+    };
+
+    let token = encode(
+        &Header::default(), // HS256
+        &claims,
+        &EncodingKey::from_secret(secret),
+    )?;
+
+    // Persist JTI for revocation checks.
+    let expires_at = Utc::now()
+        .checked_add_signed(chrono::Duration::seconds(TOKEN_TTL_SECS))
+        .unwrap_or_else(Utc::now)
+        .to_rfc3339();
+
+    sqlx::query(
+        "INSERT INTO sessions (jti, user_id, expires_at) VALUES (?, ?, ?)",
+    )
+    .bind(&jti)
+    .bind(user_id.to_string())
+    .bind(expires_at)
+    .execute(pool)
+    .await?;
+
+    Ok(token)
+}
+
+/// Decode and validate a JWT, then check the `sessions` table for revocation.
+pub async fn validate(pool: &SqlitePool, token: &str, secret: &[u8]) -> Result<Claims> {
+    let mut validation = Validation::new(Algorithm::HS256);
+    validation.validate_exp = true;
+
+    let token_data = decode::<Claims>(
+        token,
+        &DecodingKey::from_secret(secret),
+        &validation,
+    )
+    .map_err(|_| ServerError::Unauthorized)?;
+
+    let claims = token_data.claims;
+
+    // Check revocation.
+    let row: Option<(i64,)> =
+        sqlx::query_as("SELECT revoked FROM sessions WHERE jti = ?")
+            .bind(&claims.jti)
+            .fetch_optional(pool)
+            .await?;
+
+    match row {
+        None => return Err(ServerError::Unauthorized), // JTI unknown
+        Some((revoked,)) if revoked != 0 => return Err(ServerError::Unauthorized),
+        _ => {}
+    }
+
+    Ok(claims)
+}
+
+/// Mark a JWT as revoked (logout / forced expiry).
+pub async fn revoke(pool: &SqlitePool, jti: &str) -> Result<()> {
+    sqlx::query("UPDATE sessions SET revoked = 1 WHERE jti = ?")
+        .bind(jti)
+        .execute(pool)
+        .await?;
+    Ok(())
+}
diff --git a/backchannel-server/src/config.rs b/backchannel-server/src/config.rs
new file mode 100644
index 0000000..d2b3bcf
--- /dev/null
+++ b/backchannel-server/src/config.rs
@@ -0,0 +1,84 @@
+use anyhow::Result;
+
+/// Runtime configuration for the BackChannel server.
+/// Loaded from environment variables with sensible development defaults.
+pub struct ServerConfig {
+    /// TCP address to bind, e.g. `0.0.0.0:7777`
+    pub bind_addr: String,
+
+    /// HTTP address for the embedded web UI, e.g. `0.0.0.0:8080`
+    pub http_bind_addr: String,
+
+    /// SQLite connection string, e.g. `sqlite:backchannel.db`
+    pub db_url: String,
+
+    /// Raw bytes for HMAC-SHA256 JWT signing. In production, set
+    /// `BC_JWT_SECRET` to a long, random hex string.
+    pub jwt_secret: Vec<u8>,
+
+    /// Enable TLS on the WebSocket listener. Requires `tls_cert_path`
+    /// and `tls_key_path` when true.
+    pub tls_enabled: bool,
+
+    /// Path to the PEM-encoded TLS certificate chain.
+    pub tls_cert_path: Option<String>,
+
+    /// Path to the PEM-encoded private key.
+    pub tls_key_path: Option<String>,
+}
+
+impl ServerConfig {
+    /// Load configuration from environment variables.
+    ///
+    /// | Variable         | Default                     |
+    /// |------------------|-----------------------------|
+    /// | `BC_BIND_ADDR`   | `0.0.0.0:7777`              |
+    /// | `BC_HTTP_ADDR`   | `0.0.0.0:8080`              |
+    /// | `BC_DB_URL`      | `sqlite:backchannel.db`     |
+    /// | `BC_JWT_SECRET`  | *insecure dev placeholder*  |
+    /// | `BC_TLS`         | `false`                     |
+    /// | `BC_TLS_CERT`    | *(none)*                    |
+    /// | `BC_TLS_KEY`     | *(none)*                    |
+    pub fn from_env() -> Result<Self> {
+        let bind_addr = std::env::var("BC_BIND_ADDR")
+            .unwrap_or_else(|_| "0.0.0.0:7777".into());
+        let http_bind_addr = std::env::var("BC_HTTP_ADDR")
+            .unwrap_or_else(|_| "0.0.0.0:8080".into());
+
+        let db_url = std::env::var("BC_DB_URL")
+            .unwrap_or_else(|_| "sqlite:backchannel.db".into());
+
+        let jwt_secret = match std::env::var("BC_JWT_SECRET") {
+            Ok(s) => s.into_bytes(),
+            Err(_) => {
+                tracing::warn!(
+                    "BC_JWT_SECRET not set — using insecure dev placeholder. \
+                     Set this env var before deploying."
+                );
+                b"CHANGE-ME-dev-only-jwt-secret-32b".to_vec()
+            }
+        };
+
+        let tls_enabled = std::env::var("BC_TLS")
+            .map(|v| v.eq_ignore_ascii_case("true") || v == "1")
+            .unwrap_or(false);
+
+        let tls_cert_path = std::env::var("BC_TLS_CERT").ok();
+        let tls_key_path  = std::env::var("BC_TLS_KEY").ok();
+
+        if tls_enabled {
+            anyhow::ensure!(tls_cert_path.is_some(), "BC_TLS_CERT must be set when BC_TLS=true");
+            anyhow::ensure!(tls_key_path.is_some(),  "BC_TLS_KEY must be set when BC_TLS=true");
+        }
+
+        Ok(Self {
+            bind_addr,
+            http_bind_addr,
+            db_url,
+            jwt_secret,
+            tls_enabled,
+            tls_cert_path,
+            tls_key_path,
+        })
+    }
+}
diff --git a/backchannel-server/src/db/channels.rs b/backchannel-server/src/db/channels.rs
new file mode 100644
index 0000000..d87f112
--- /dev/null
+++ b/backchannel-server/src/db/channels.rs
@@ -0,0 +1,78 @@
+use chrono::Utc;
+use sqlx::SqlitePool;
+use uuid::Uuid;
+
+use crate::error::{Result, ServerError};
+
+#[derive(Debug, sqlx::FromRow)]
+pub struct ChannelRow {
+    pub id: String,
+    pub name: String,
+    pub topic: Option<String>,
+    pub created_by: String,
+    pub created_at: String,
+}
+
+impl ChannelRow {
+    pub fn uuid(&self) -> Result<Uuid> {
+        Uuid::parse_str(&self.id).map_err(|e| ServerError::Internal(e.to_string()))
+    }
+}
+
+pub async fn create(
+    pool: &SqlitePool,
+    name: &str,
+    topic: Option<&str>,
+    created_by: Uuid,
+) -> Result<Uuid> {
+    let id = Uuid::new_v4();
+    let now = Utc::now().to_rfc3339();
+
+    sqlx::query(
+        "INSERT INTO channels (id, name, topic, created_by, created_at) VALUES (?, ?, ?, ?, ?)",
+    )
+    .bind(id.to_string())
+    .bind(name)
+    .bind(topic)
+    .bind(created_by.to_string())
+    .bind(now)
+    .execute(pool)
+    .await?;
+
+    Ok(id)
+}
+
+pub async fn list(pool: &SqlitePool) -> Result<Vec<ChannelRow>> {
+    let rows = sqlx::query_as::<_, ChannelRow>(
+        "SELECT id, name, topic, created_by, created_at FROM channels ORDER BY created_at ASC",
+    )
+    .fetch_all(pool)
+    .await?;
+    Ok(rows)
+}
+
+pub async fn find_by_id(pool: &SqlitePool, id: Uuid) -> Result<Option<ChannelRow>> {
+    let row = sqlx::query_as::<_, ChannelRow>(
+        "SELECT id, name, topic, created_by, created_at FROM channels WHERE id = ?",
+    )
+    .bind(id.to_string())
+    .fetch_optional(pool)
+    .await?;
+    Ok(row)
+}
+
+pub async fn delete(pool: &SqlitePool, id: Uuid) -> Result<bool> {
+    let result = sqlx::query("DELETE FROM channels WHERE id = ?")
+        .bind(id.to_string())
+        .execute(pool)
+        .await?;
+    Ok(result.rows_affected() > 0)
+}
+
+pub async fn name_exists(pool: &SqlitePool, name: &str) -> Result<bool> {
+    let count: (i64,) = sqlx::query_as("SELECT COUNT(*) FROM channels WHERE name = ?")
+        .bind(name)
+        .fetch_one(pool)
+        .await?;
+    Ok(count.0 > 0)
+}
diff --git a/backchannel-server/src/db/keys.rs b/backchannel-server/src/db/keys.rs
new file mode 100644
index 0000000..d7dbc73
--- /dev/null
+++ b/backchannel-server/src/db/keys.rs
@@ -0,0 +1,17 @@
+use sqlx::SqlitePool;
+use uuid::Uuid;
+
+use crate::error::Result;
+
+/// Look up the registered Ed25519 identity public key for a user.
+///
+/// Returns `None` if the user does not exist or has no key on record
+/// (the latter shouldn't happen after registration, but is handled defensively).
+pub async fn get_identity_key(pool: &SqlitePool, user_id: Uuid) -> Result<Option<String>> {
+    let row: Option<(String,)> =
+        sqlx::query_as("SELECT identity_pubkey FROM users WHERE id = ?")
+            .bind(user_id.to_string())
+            .fetch_optional(pool)
+            .await?;
+    Ok(row.map(|(k,)| k))
+}
diff --git a/backchannel-server/src/db/messages.rs b/backchannel-server/src/db/messages.rs
new file mode 100644
index 0000000..a0955ea
--- /dev/null
+++ b/backchannel-server/src/db/messages.rs
@@ -0,0 +1,210 @@
+use backchannel_common::protocol::server::{HistoricChannelMessage, HistoricDm};
+use chrono::{DateTime, Utc};
+use sqlx::SqlitePool;
+use uuid::Uuid;
+
+use crate::error::{Result, ServerError};
+
+#[derive(Debug, sqlx::FromRow)]
+struct ChannelMessageRow {
+    pub id: String,
+    pub channel_id: String,
+    pub author_id: String,
+    pub author_username: String,
+    pub content: String,
+    pub created_at: String,
+}
+
+#[derive(Debug, sqlx::FromRow)]
+struct DmRow {
+    pub id: String,
+    pub sender_id: String,
+    pub ciphertext: String,
+    pub nonce: String,
+    pub created_at: String,
+}
+
+pub async fn insert_channel_message(
+    pool: &SqlitePool,
+    channel_id: Uuid,
+    author_id: Uuid,
+    content: &str,
+) -> Result<(Uuid, DateTime<Utc>)> {
+    let id = Uuid::new_v4();
+    let now = Utc::now();
+    let now_str = now.to_rfc3339();
+
+    sqlx::query(
+        "INSERT INTO channel_messages (id, channel_id, author_id, content, created_at)
+         VALUES (?, ?, ?, ?, ?)",
+    )
+    .bind(id.to_string())
+    .bind(channel_id.to_string())
+    .bind(author_id.to_string())
+    .bind(content)
+    .bind(&now_str)
+    .execute(pool)
+    .await?;
+
+    Ok((id, now))
+}
+
+pub async fn fetch_channel_history(
+    pool: &SqlitePool,
+    channel_id: Uuid,
+    before_message_id: Option<Uuid>,
+    limit: u32,
+) -> Result<Vec<HistoricChannelMessage>> {
+    let limit = limit.min(100) as i64;
+
+    let rows: Vec<ChannelMessageRow> = if let Some(before_id) = before_message_id {
+        // Fetch messages older than `before_id` by joining to get its created_at
+        sqlx::query_as::<_, ChannelMessageRow>(
+            "SELECT m.id, m.channel_id, m.author_id, u.username AS author_username,
+                    m.content, m.created_at
+             FROM channel_messages m
+             JOIN users u ON u.id = m.author_id
+             WHERE m.channel_id = ?
+               AND m.created_at < (SELECT created_at FROM channel_messages WHERE id = ?)
+             ORDER BY m.created_at DESC
+             LIMIT ?",
+        )
+        .bind(channel_id.to_string())
+        .bind(before_id.to_string())
+        .bind(limit)
+        .fetch_all(pool)
+        .await?
+    } else {
+        sqlx::query_as::<_, ChannelMessageRow>(
+            "SELECT m.id, m.channel_id, m.author_id, u.username AS author_username,
+                    m.content, m.created_at
+             FROM channel_messages m
+             JOIN users u ON u.id = m.author_id
+             WHERE m.channel_id = ?
+             ORDER BY m.created_at DESC
+             LIMIT ?",
+        )
+        .bind(channel_id.to_string())
+        .bind(limit)
+        .fetch_all(pool)
+        .await?
+    };
+
+    let mut messages: Vec<HistoricChannelMessage> = rows
+        .into_iter()
+        .map(|r| {
+            let ts = r
+                .created_at
+                .parse::<DateTime<Utc>>()
+                .unwrap_or_else(|_| Utc::now());
+            Ok(HistoricChannelMessage {
+                message_id: Uuid::parse_str(&r.id)
+                    .map_err(|e| ServerError::Internal(e.to_string()))?,
+                author_id: Uuid::parse_str(&r.author_id)
+                    .map_err(|e| ServerError::Internal(e.to_string()))?,
+                author_username: r.author_username,
+                content: r.content,
+                timestamp: ts,
+            })
+        })
+        .collect::<Result<Vec<_>>>()?;
+
+    // Return in chronological order (oldest first).
+    messages.reverse();
+    Ok(messages)
+}
+
+pub async fn insert_dm(
+    pool: &SqlitePool,
+    sender_id: Uuid,
+    recipient_id: Uuid,
+    ciphertext: &str,
+    nonce: &str,
+) -> Result<(Uuid, DateTime<Utc>)> {
+    let id = Uuid::new_v4();
+    let now = Utc::now();
+    let now_str = now.to_rfc3339();
+
+    sqlx::query(
+        "INSERT INTO direct_messages (id, sender_id, recipient_id, ciphertext, nonce, created_at)
+         VALUES (?, ?, ?, ?, ?, ?)",
+    )
+    .bind(id.to_string())
+    .bind(sender_id.to_string())
+    .bind(recipient_id.to_string())
+    .bind(ciphertext)
+    .bind(nonce)
+    .bind(&now_str)
+    .execute(pool)
+    .await?;
+
+    Ok((id, now))
+}
+
+pub async fn fetch_dm_history(
+    pool: &SqlitePool,
+    user_a: Uuid,
+    user_b: Uuid,
+    before_message_id: Option<Uuid>,
+    limit: u32,
+) -> Result<Vec<HistoricDm>> {
+    let limit = limit.min(100) as i64;
+
+    let rows: Vec<DmRow> = if let Some(before_id) = before_message_id {
+        sqlx::query_as::<_, DmRow>(
+            "SELECT id, sender_id, ciphertext, nonce, created_at
+             FROM direct_messages
+             WHERE ((sender_id = ? AND recipient_id = ?)
+                 OR (sender_id = ? AND recipient_id = ?))
+               AND created_at < (SELECT created_at FROM direct_messages WHERE id = ?)
+             ORDER BY created_at DESC
+             LIMIT ?",
+        )
+        .bind(user_a.to_string())
+        .bind(user_b.to_string())
+        .bind(user_b.to_string())
+        .bind(user_a.to_string())
+        .bind(before_id.to_string())
+        .bind(limit)
+        .fetch_all(pool)
+        .await?
+    } else {
+        sqlx::query_as::<_, DmRow>(
+            "SELECT id, sender_id, ciphertext, nonce, created_at
+             FROM direct_messages
+             WHERE (sender_id = ? AND recipient_id = ?)
+                OR (sender_id = ? AND recipient_id = ?)
+             ORDER BY created_at DESC
+             LIMIT ?",
+        )
+        .bind(user_a.to_string())
+        .bind(user_b.to_string())
+        .bind(user_b.to_string())
+        .bind(user_a.to_string())
+        .bind(limit)
+        .fetch_all(pool)
+        .await?
+    };
+
+    let mut messages: Vec<HistoricDm> = rows
+        .into_iter()
+        .map(|r| {
+            let ts = r
+                .created_at
+                .parse::<DateTime<Utc>>()
+                .unwrap_or_else(|_| Utc::now());
+            Ok(HistoricDm {
+                message_id: Uuid::parse_str(&r.id)
+                    .map_err(|e| ServerError::Internal(e.to_string()))?,
+                sender_id: Uuid::parse_str(&r.sender_id)
+                    .map_err(|e| ServerError::Internal(e.to_string()))?,
+                ciphertext: r.ciphertext,
+                nonce: r.nonce,
+                timestamp: ts,
+            })
+        })
+        .collect::<Result<Vec<_>>>()?;
+
+    messages.reverse();
+    Ok(messages)
+}
diff --git a/backchannel-server/src/db/migrations/001_initial.sql b/backchannel-server/src/db/migrations/001_initial.sql
new file mode 100644
index 0000000..dfc1ec8
--- /dev/null
+++ b/backchannel-server/src/db/migrations/001_initial.sql
@@ -0,0 +1,85 @@
+-- ── Users ─────────────────────────────────────────────────────────────────────
+CREATE TABLE IF NOT EXISTS users (
+    id              TEXT NOT NULL PRIMARY KEY,
+    username        TEXT NOT NULL UNIQUE,
+    password_hash   TEXT NOT NULL,
+    identity_pubkey TEXT NOT NULL,
+    created_at      TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
+    updated_at      TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
+);
+
+-- ── Roles ─────────────────────────────────────────────────────────────────────
+CREATE TABLE IF NOT EXISTS roles (
+    id           TEXT NOT NULL PRIMARY KEY,
+    name         TEXT NOT NULL UNIQUE,
+    permissions  INTEGER NOT NULL DEFAULT 0,
+    created_at   TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
+);
+
+-- Seed built-in roles.
+-- admin: all bits set (i64::MAX in SQLite integer storage).
+-- member: READ_MESSAGES (bit 0) | SEND_MESSAGES (bit 1) = 3
+INSERT OR IGNORE INTO roles (id, name, permissions) VALUES
+    ('00000000-0000-0000-0000-000000000001', 'admin',  9223372036854775807),
+    ('00000000-0000-0000-0000-000000000002', 'member', 3);
+
+-- ── User ↔ Role membership ─────────────────────────────────────────────────────
+CREATE TABLE IF NOT EXISTS user_roles (
+    user_id     TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    role_id     TEXT NOT NULL REFERENCES roles(id) ON DELETE CASCADE,
+    assigned_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
+    PRIMARY KEY (user_id, role_id)
+);
+
+-- ── Channels ───────────────────────────────────────────────────────────────────
+CREATE TABLE IF NOT EXISTS channels (
+    id         TEXT NOT NULL PRIMARY KEY,
+    name       TEXT NOT NULL UNIQUE,
+    topic      TEXT,
+    created_by TEXT NOT NULL,
+    created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
+);
+
+-- Seed a default channel owned by a system placeholder user.
+-- The created_by value references no real user; foreign key is intentionally
+-- left loose here since the system user is never inserted.
+INSERT OR IGNORE INTO channels (id, name, created_by) VALUES
+    ('00000000-0000-0000-0000-000000000010', 'general', '00000000-0000-0000-0000-000000000000');
+
+-- ── Channel messages ───────────────────────────────────────────────────────────
+CREATE TABLE IF NOT EXISTS channel_messages (
+    id         TEXT NOT NULL PRIMARY KEY,
+    channel_id TEXT NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
+    author_id  TEXT NOT NULL REFERENCES users(id),
+    content    TEXT NOT NULL,
+    created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
+);
+
+CREATE INDEX IF NOT EXISTS idx_channel_messages_channel_created
+    ON channel_messages (channel_id, created_at DESC);
+
+-- ── Direct messages ────────────────────────────────────────────────────────────
+-- Ciphertext is stored opaquely. The server cannot decrypt DM content.
+CREATE TABLE IF NOT EXISTS direct_messages (
+    id           TEXT NOT NULL PRIMARY KEY,
+    sender_id    TEXT NOT NULL REFERENCES users(id),
+    recipient_id TEXT NOT NULL REFERENCES users(id),
+    ciphertext   TEXT NOT NULL,
+    nonce        TEXT NOT NULL,
+    created_at   TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
+);
+
+CREATE INDEX IF NOT EXISTS idx_dm_pair_created
+    ON direct_messages (sender_id, recipient_id, created_at DESC);
+
+-- ── Sessions ───────────────────────────────────────────────────────────────────
+-- JWT IDs stored here enable soft revocation (logout / forced expiry).
+CREATE TABLE IF NOT EXISTS sessions (
+    jti        TEXT NOT NULL PRIMARY KEY,
+    user_id    TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    created_at TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now')),
+    expires_at TEXT NOT NULL,
+    revoked    INTEGER NOT NULL DEFAULT 0
+);
+
+CREATE INDEX IF NOT EXISTS idx_sessions_user ON sessions (user_id);
diff --git a/backchannel-server/src/db/mod.rs b/backchannel-server/src/db/mod.rs
new file mode 100644
index 0000000..cbcc599
--- /dev/null
+++ b/backchannel-server/src/db/mod.rs
@@ -0,0 +1,5 @@
+pub mod channels;
+pub mod keys;
+pub mod messages;
+pub mod roles;
+pub mod users;
diff --git a/backchannel-server/src/db/roles.rs b/backchannel-server/src/db/roles.rs
new file mode 100644
index 0000000..da89f94
--- /dev/null
+++ b/backchannel-server/src/db/roles.rs
@@ -0,0 +1,86 @@
+use chrono::Utc;
+use sqlx::SqlitePool;
+use uuid::Uuid;
+
+use crate::error::{Result, ServerError};
+
+#[derive(Debug, sqlx::FromRow)]
+pub struct RoleRow {
+    pub id: String,
+    pub name: String,
+    pub permissions: i64,
+    pub created_at: String,
+}
+
+impl RoleRow {
+    pub fn uuid(&self) -> Result<Uuid> {
+        Uuid::parse_str(&self.id).map_err(|e| ServerError::Internal(e.to_string()))
+    }
+
+    /// Returns the permissions bitmask as `u64` (SQLite stores it as `i64`).
+    pub fn permissions_u64(&self) -> u64 {
+        self.permissions as u64
+    }
+}
+
+pub async fn create(pool: &SqlitePool, name: &str, permissions: u64) -> Result<Uuid> {
+    let id = Uuid::new_v4();
+    let now = Utc::now().to_rfc3339();
+
+    sqlx::query("INSERT INTO roles (id, name, permissions, created_at) VALUES (?, ?, ?, ?)")
+        .bind(id.to_string())
+        .bind(name)
+        .bind(permissions as i64)
+        .bind(now)
+        .execute(pool)
+        .await?;
+
+    Ok(id)
+}
+
+pub async fn find_by_id(pool: &SqlitePool, id: Uuid) -> Result<Option<RoleRow>> {
+    let row = sqlx::query_as::<_, RoleRow>(
+        "SELECT id, name, permissions, created_at FROM roles WHERE id = ?",
+    )
+    .bind(id.to_string())
+    .fetch_optional(pool)
+    .await?;
+    Ok(row)
+}
+
+pub async fn assign(pool: &SqlitePool, user_id: Uuid, role_id: Uuid) -> Result<()> {
+    let now = Utc::now().to_rfc3339();
+    sqlx::query(
+        "INSERT OR IGNORE INTO user_roles (user_id, role_id, assigned_at) VALUES (?, ?, ?)",
+    )
+    .bind(user_id.to_string())
+    .bind(role_id.to_string())
+    .bind(now)
+    .execute(pool)
+    .await?;
+    Ok(())
+}
+
+pub async fn revoke(pool: &SqlitePool, user_id: Uuid, role_id: Uuid) -> Result<()> {
+    sqlx::query("DELETE FROM user_roles WHERE user_id = ? AND role_id = ?")
+        .bind(user_id.to_string())
+        .bind(role_id.to_string())
+        .execute(pool)
+        .await?;
+    Ok(())
+}
+
+/// Compute the effective permission bitmask for a user by OR-ing all their role permissions.
+pub async fn get_user_permissions(pool: &SqlitePool, user_id: Uuid) -> Result<u64> {
+    let rows: Vec<(i64,)> = sqlx::query_as(
+        "SELECT r.permissions FROM roles r
+         JOIN user_roles ur ON ur.role_id = r.id
+         WHERE ur.user_id = ?",
+    )
+    .bind(user_id.to_string())
+    .fetch_all(pool)
+    .await?;
+
+    let perms = rows.into_iter().fold(0u64, |acc, (p,)| acc | p as u64);
+    Ok(perms)
+}
diff --git a/backchannel-server/src/db/users.rs b/backchannel-server/src/db/users.rs
new file mode 100644
index 0000000..70041e4
--- /dev/null
+++ b/backchannel-server/src/db/users.rs
@@ -0,0 +1,115 @@
+use chrono::Utc;
+use sqlx::SqlitePool;
+use uuid::Uuid;
+
+use crate::error::{Result, ServerError};
+
+/// A row from the `users` table.
+#[derive(Debug, sqlx::FromRow)]
+pub struct UserRow {
+    pub id: String,
+    pub username: String,
+    pub password_hash: String,
+    pub identity_pubkey: String,
+    pub created_at: String,
+    pub updated_at: String,
+}
+
+impl UserRow {
+    pub fn uuid(&self) -> Result<Uuid> {
+        Uuid::parse_str(&self.id).map_err(|e| ServerError::Internal(e.to_string()))
+    }
+}
+
+/// Insert a new user. Returns the new row's UUID.
+pub async fn create(
+    pool: &SqlitePool,
+    username: &str,
+    password_hash: &str,
+    identity_pubkey: &str,
+) -> Result<Uuid> {
+    let id = Uuid::new_v4();
+    let now = Utc::now().to_rfc3339();
+
+    sqlx::query(
+        "INSERT INTO users (id, username, password_hash, identity_pubkey, created_at, updated_at)
+         VALUES (?, ?, ?, ?, ?, ?)",
+    )
+    .bind(id.to_string())
+    .bind(username)
+    .bind(password_hash)
+    .bind(identity_pubkey)
+    .bind(&now)
+    .bind(&now)
+    .execute(pool)
+    .await?;
+
+    Ok(id)
+}
+
+/// Find a user by username.
+pub async fn find_by_username(pool: &SqlitePool, username: &str) -> Result<Option<UserRow>> {
+    let row = sqlx::query_as::<_, UserRow>(
+        "SELECT id, username, password_hash, identity_pubkey, created_at, updated_at
+         FROM users WHERE username = ?",
+    )
+    .bind(username)
+    .fetch_optional(pool)
+    .await?;
+
+    Ok(row)
+}
+
+/// Find a user by UUID.
+pub async fn find_by_id(pool: &SqlitePool, id: Uuid) -> Result<Option<UserRow>> {
+    let row = sqlx::query_as::<_, UserRow>(
+        "SELECT id, username, password_hash, identity_pubkey, created_at, updated_at
+         FROM users WHERE id = ?",
+    )
+    .bind(id.to_string())
+    .fetch_optional(pool)
+    .await?;
+
+    Ok(row)
+}
+
+/// Update (or set for the first time) a user's Ed25519 identity public key.
+/// Called on every login to allow transparent key rotation.
+pub async fn update_identity_key(
+    pool: &SqlitePool,
+    user_id: Uuid,
+    identity_pubkey: &str,
+) -> Result<()> {
+    let now = Utc::now().to_rfc3339();
+    sqlx::query("UPDATE users SET identity_pubkey = ?, updated_at = ? WHERE id = ?")
+        .bind(identity_pubkey)
+        .bind(now)
+        .bind(user_id.to_string())
+        .execute(pool)
+        .await?;
+    Ok(())
+}
+
+/// Check whether a username is already taken.
+pub async fn username_exists(pool: &SqlitePool, username: &str) -> Result<bool> {
+    let count: (i64,) =
+        sqlx::query_as("SELECT COUNT(*) FROM users WHERE username = ?")
+            .bind(username)
+            .fetch_one(pool)
+            .await?;
+    Ok(count.0 > 0)
+}
+
+/// Assign the built-in `member` role to a newly registered user.
+pub async fn assign_member_role(pool: &SqlitePool, user_id: Uuid) -> Result<()> {
+    let now = Utc::now().to_rfc3339();
+    sqlx::query(
+        "INSERT OR IGNORE INTO user_roles (user_id, role_id, assigned_at) VALUES (?, ?, ?)",
+    )
+    .bind(user_id.to_string())
+    .bind("00000000-0000-0000-0000-000000000002") // member role UUID
+    .bind(now)
+    .execute(pool)
+    .await?;
+    Ok(())
+}
diff --git a/backchannel-server/src/error.rs b/backchannel-server/src/error.rs
new file mode 100644
index 0000000..ff958cc
--- /dev/null
+++ b/backchannel-server/src/error.rs
@@ -0,0 +1,59 @@
+use thiserror::Error;
+
+pub type Result<T> = std::result::Result<T, ServerError>;
+
+#[derive(Debug, Error)]
+pub enum ServerError {
+    #[error("unauthorized")]
+    Unauthorized,
+
+    #[error("forbidden")]
+    Forbidden,
+
+    #[error("not found: {0}")]
+    NotFound(String),
+
+    #[error("bad request: {0}")]
+    BadRequest(String),
+
+    #[error("connection closed")]
+    ConnectionClosed,
+
+    #[error("database error: {0}")]
+    Database(#[from] sqlx::Error),
+
+    #[error("serialization error: {0}")]
+    Serialization(#[from] serde_json::Error),
+
+    #[error("JWT error: {0}")]
+    Jwt(#[from] jsonwebtoken::errors::Error),
+
+    #[error("password hash error: {0}")]
+    PasswordHash(String),
+
+    #[error("common error: {0}")]
+    Common(#[from] backchannel_common::BackchannelError),
+
+    #[error("internal error: {0}")]
+    Internal(String),
+}
+
+impl From<argon2::password_hash::Error> for ServerError {
+    fn from(e: argon2::password_hash::Error) -> Self {
+        ServerError::PasswordHash(e.to_string())
+    }
+}
+
+/// HTTP-style error code for `ServerMessage::Error`.
+impl ServerError {
+    pub fn code(&self) -> u16 {
+        match self {
+            ServerError::Unauthorized    => 401,
+            ServerError::Forbidden       => 403,
+            ServerError::NotFound(_)     => 404,
+            ServerError::BadRequest(_)   => 400,
+            ServerError::ConnectionClosed => 503,
+            _                            => 500,
+        }
+    }
+}
diff --git a/backchannel-server/src/handlers/auth.rs b/backchannel-server/src/handlers/auth.rs
new file mode 100644
index 0000000..37b7542
--- /dev/null
+++ b/backchannel-server/src/handlers/auth.rs
@@ -0,0 +1,124 @@
+use std::sync::Arc;
+
+use backchannel_common::protocol::ServerMessage;
+use jsonwebtoken::{decode, Algorithm, DecodingKey, Validation};
+
+use crate::auth::{password, token};
+use crate::db::users;
+use crate::error::{Result, ServerError};
+use crate::state::{AppState, ChannelBroadcast};
+use crate::ws::session::Session;
+
+pub async fn handle_login(
+    session: &mut Session,
+    state: &Arc<AppState>,
+    username: String,
+    password_plain: String,
+    identity_pubkey: String,
+) -> Result<()> {
+    let user = users::find_by_username(&state.db, &username)
+        .await?
+        .ok_or(ServerError::Unauthorized)?;
+
+    password::verify(&password_plain, &user.password_hash)?;
+    let user_id = user.uuid()?;
+
+    // Update identity key on every login to allow transparent key rotation.
+    users::update_identity_key(&state.db, user_id, &identity_pubkey).await?;
+
+    let jwt = token::issue(&state.db, user_id, &username, &state.jwt_secret).await?;
+    let jti = extract_jti(&jwt, &state.jwt_secret)?;
+
+    session.user_id  = Some(user_id);
+    session.username = Some(username.clone());
+    session.jti      = Some(jti);
+
+    state.register_session(session.conn_id, user_id, username.clone(), session.tx.clone()).await;
+
+    let _ = state.channel_broadcast.send(ChannelBroadcast {
+        message: ServerMessage::UserOnline { user_id, username: username.clone() },
+    });
+
+    session.send(ServerMessage::AuthSuccess { user_id, username, session_token: jwt })
+}
+
+pub async fn handle_register(
+    session: &mut Session,
+    state: &Arc<AppState>,
+    username: String,
+    password_plain: String,
+    identity_pubkey: String,
+) -> Result<()> {
+    if username.len() < 2 || username.len() > 32 {
+        return Err(ServerError::BadRequest("Username must be 2–32 characters".into()));
+    }
+    if password_plain.len() < 8 {
+        return Err(ServerError::BadRequest("Password must be at least 8 characters".into()));
+    }
+    if users::username_exists(&state.db, &username).await? {
+        return Err(ServerError::BadRequest("Username already taken".into()));
+    }
+
+    let hash    = password::hash(&password_plain)?;
+    let user_id = users::create(&state.db, &username, &hash, &identity_pubkey).await?;
+    users::assign_member_role(&state.db, user_id).await?;
+
+    let jwt = token::issue(&state.db, user_id, &username, &state.jwt_secret).await?;
+    let jti = extract_jti(&jwt, &state.jwt_secret)?;
+
+    session.user_id  = Some(user_id);
+    session.username = Some(username.clone());
+    session.jti      = Some(jti);
+
+    state.register_session(session.conn_id, user_id, username.clone(), session.tx.clone()).await;
+
+    let _ = state.channel_broadcast.send(ChannelBroadcast {
+        message: ServerMessage::UserOnline { user_id, username: username.clone() },
+    });
+
+    session.send(ServerMessage::AuthSuccess { user_id, username, session_token: jwt })
+}
+
+pub async fn handle_resume(
+    session: &mut Session,
+    state: &Arc<AppState>,
+    token_str: String,
+) -> Result<()> {
+    let claims  = token::validate(&state.db, &token_str, &state.jwt_secret).await?;
+    let user_id = claims.user_id()?;
+
+    session.user_id  = Some(user_id);
+    session.username = Some(claims.username.clone());
+    session.jti      = Some(claims.jti.clone());
+
+    state.register_session(session.conn_id, user_id, claims.username.clone(), session.tx.clone()).await;
+
+    let _ = state.channel_broadcast.send(ChannelBroadcast {
+        message: ServerMessage::UserOnline { user_id, username: claims.username.clone() },
+    });
+
+    session.send(ServerMessage::AuthSuccess {
+        user_id,
+        username:      claims.username,
+        session_token: token_str,
+    })
+}
+
+pub async fn handle_logout(session: &mut Session, state: &Arc<AppState>) -> Result<()> {
+    session.require_auth()?;
+    if let Some(jti) = session.jti.take() {
+        token::revoke(&state.db, &jti).await?;
+    }
+    session.user_id  = None;
+    session.username = None;
+    Ok(())
+}
+
+/// Extract the JTI claim from a JWT without re-running expiry validation.
+/// Used immediately after `token::issue` to store the JTI in the session.
+fn extract_jti(jwt: &str, secret: &[u8]) -> Result<String> {
+    let mut v = Validation::new(Algorithm::HS256);
+    v.validate_exp = false;
+    let data = decode::<token::Claims>(jwt, &DecodingKey::from_secret(secret), &v)?;
+    Ok(data.claims.jti)
+}
diff --git a/backchannel-server/src/handlers/channels.rs b/backchannel-server/src/handlers/channels.rs
new file mode 100644
index 0000000..91cbdf1
--- /dev/null
+++ b/backchannel-server/src/handlers/channels.rs
@@ -0,0 +1,107 @@
+use std::sync::Arc;
+
+use backchannel_common::protocol::ServerMessage;
+use backchannel_common::types::{has_permission, PermissionFlags};
+use uuid::Uuid;
+
+use crate::db::{channels, messages, roles};
+use crate::error::{Result, ServerError};
+use crate::state::{AppState, ChannelBroadcast};
+use crate::ws::session::Session;
+
+pub async fn handle_send(
+    session: &Session,
+    state: &Arc<AppState>,
+    channel_id: Uuid,
+    content: String,
+) -> Result<()> {
+    let user_id  = session.require_auth()?;
+    let username = session.require_username()?.to_string();
+
+    channels::find_by_id(&state.db, channel_id)
+        .await?
+        .ok_or_else(|| ServerError::NotFound("Channel not found".into()))?;
+
+    let perms = roles::get_user_permissions(&state.db, user_id).await?;
+    if !has_permission(perms, PermissionFlags::SEND_MESSAGES) {
+        return Err(ServerError::Forbidden);
+    }
+
+    let (message_id, timestamp) =
+        messages::insert_channel_message(&state.db, channel_id, user_id, &content).await?;
+
+    let _ = state.channel_broadcast.send(ChannelBroadcast {
+        message: ServerMessage::ChannelMessage {
+            message_id,
+            channel_id,
+            author_id: user_id,
+            author_username: username,
+            content,
+            timestamp,
+        },
+    });
+
+    Ok(())
+}
+
+pub async fn handle_history(
+    session: &Session,
+    state: &Arc<AppState>,
+    channel_id: Uuid,
+    before_message_id: Option<Uuid>,
+    limit: u32,
+) -> Result<()> {
+    let user_id = session.require_auth()?;
+    let perms   = roles::get_user_permissions(&state.db, user_id).await?;
+    if !has_permission(perms, PermissionFlags::READ_MESSAGES) {
+        return Err(ServerError::Forbidden);
+    }
+
+    let msgs = messages::fetch_channel_history(&state.db, channel_id, before_message_id, limit).await?;
+    session.send(ServerMessage::ChannelHistory { channel_id, messages: msgs })
+}
+
+pub async fn handle_create(
+    session: &Session,
+    state: &Arc<AppState>,
+    name: String,
+    topic: Option<String>,
+) -> Result<()> {
+    let user_id = session.require_auth()?;
+    let perms   = roles::get_user_permissions(&state.db, user_id).await?;
+    if !has_permission(perms, PermissionFlags::MANAGE_CHANNELS) {
+        return Err(ServerError::Forbidden);
+    }
+    if channels::name_exists(&state.db, &name).await? {
+        return Err(ServerError::BadRequest("Channel name already exists".into()));
+    }
+
+    let channel_id = channels::create(&state.db, &name, topic.as_deref(), user_id).await?;
+
+    let _ = state.channel_broadcast.send(ChannelBroadcast {
+        message: ServerMessage::ChannelCreated { channel_id, name, topic },
+    });
+
+    Ok(())
+}
+
+pub async fn handle_delete(
+    session: &Session,
+    state: &Arc<AppState>,
+    channel_id: Uuid,
+) -> Result<()> {
+    let user_id = session.require_auth()?;
+    let perms   = roles::get_user_permissions(&state.db, user_id).await?;
+    if !has_permission(perms, PermissionFlags::MANAGE_CHANNELS) {
+        return Err(ServerError::Forbidden);
+    }
+    if !channels::delete(&state.db, channel_id).await? {
+        return Err(ServerError::NotFound("Channel not found".into()));
+    }
+
+    let _ = state.channel_broadcast.send(ChannelBroadcast {
+        message: ServerMessage::ChannelDeleted { channel_id },
+    });
+
+    Ok(())
+}
diff --git a/backchannel-server/src/handlers/dms.rs b/backchannel-server/src/handlers/dms.rs
new file mode 100644
index 0000000..e30218e
--- /dev/null
+++ b/backchannel-server/src/handlers/dms.rs
@@ -0,0 +1,115 @@
+use std::sync::Arc;
+
+use backchannel_common::protocol::ServerMessage;
+use uuid::Uuid;
+
+use crate::db::messages;
+use crate::error::Result;
+use crate::state::AppState;
+use crate::ws::session::Session;
+
+pub async fn handle_init_key_exchange(
+    session: &Session,
+    state: &Arc<AppState>,
+    recipient_id: Uuid,
+    sender_ephemeral_pubkey: String,
+) -> Result<()> {
+    let initiator_id       = session.require_auth()?;
+    let initiator_username = session.require_username()?.to_string();
+
+    // Store pending exchange in AppState (cleared once recipient accepts).
+    state
+        .pending_key_exchanges
+        .lock()
+        .await
+        .insert((initiator_id, recipient_id), sender_ephemeral_pubkey.clone());
+
+    // Relay to recipient if they're currently connected.
+    state
+        .send_to_user(
+            recipient_id,
+            &ServerMessage::DmKeyExchangeRequest {
+                initiator_id,
+                initiator_username,
+                sender_ephemeral_pubkey,
+            },
+        )
+        .await;
+
+    Ok(())
+}
+
+pub async fn handle_accept_key_exchange(
+    session: &Session,
+    state: &Arc<AppState>,
+    initiator_id: Uuid,
+    recipient_ephemeral_pubkey: String,
+) -> Result<()> {
+    let recipient_id       = session.require_auth()?;
+    let recipient_username = session.require_username()?.to_string();
+
+    // Clear the pending exchange.
+    state
+        .pending_key_exchanges
+        .lock()
+        .await
+        .remove(&(initiator_id, recipient_id));
+
+    // Relay response back to initiator.
+    state
+        .send_to_user(
+            initiator_id,
+            &ServerMessage::DmKeyExchangeResponse {
+                recipient_id,
+                recipient_username,
+                recipient_ephemeral_pubkey,
+            },
+        )
+        .await;
+
+    Ok(())
+}
+
+pub async fn handle_send_dm(
+    session: &Session,
+    state: &Arc<AppState>,
+    recipient_id: Uuid,
+    ciphertext: String,
+    nonce: String,
+) -> Result<()> {
+    let sender_id       = session.require_auth()?;
+    let sender_username = session.require_username()?.to_string();
+
+    let (message_id, timestamp) =
+        messages::insert_dm(&state.db, sender_id, recipient_id, &ciphertext, &nonce).await?;
+
+    let msg = ServerMessage::DirectMessage {
+        message_id,
+        sender_id,
+        sender_username,
+        ciphertext,
+        nonce,
+        timestamp,
+    };
+
+    // Deliver to recipient and to sender's other sessions (multi-client sync).
+    state.send_to_user(recipient_id, &msg).await;
+    state.send_to_user(sender_id, &msg).await;
+
+    Ok(())
+}
+
+pub async fn handle_dm_history(
+    session: &Session,
+    state: &Arc<AppState>,
+    peer_id: Uuid,
+    before_message_id: Option<Uuid>,
+    limit: u32,
+) -> Result<()> {
+    let user_id = session.require_auth()?;
+
+    let history =
+        messages::fetch_dm_history(&state.db, user_id, peer_id, before_message_id, limit).await?;
+
+    session.send(ServerMessage::DmHistory { peer_id, messages: history })
+}
diff --git a/backchannel-server/src/handlers/mod.rs b/backchannel-server/src/handlers/mod.rs
new file mode 100644
index 0000000..4774b2b
--- /dev/null
+++ b/backchannel-server/src/handlers/mod.rs
@@ -0,0 +1,4 @@
+pub mod auth;
+pub mod channels;
+pub mod dms;
+pub mod roles;
diff --git a/backchannel-server/src/handlers/roles.rs b/backchannel-server/src/handlers/roles.rs
new file mode 100644
index 0000000..9137097
--- /dev/null
+++ b/backchannel-server/src/handlers/roles.rs
@@ -0,0 +1,87 @@
+use std::sync::Arc;
+
+use backchannel_common::protocol::ServerMessage;
+use backchannel_common::types::{has_permission, PermissionFlags};
+use uuid::Uuid;
+
+use crate::db::{keys, roles};
+use crate::error::{Result, ServerError};
+use crate::state::{AppState, ChannelBroadcast};
+use crate::ws::session::Session;
+
+pub async fn handle_create(
+    session: &Session,
+    state: &Arc<AppState>,
+    name: String,
+    permissions: u64,
+) -> Result<()> {
+    let user_id = session.require_auth()?;
+    let perms   = roles::get_user_permissions(&state.db, user_id).await?;
+    if !has_permission(perms, PermissionFlags::MANAGE_ROLES) {
+        return Err(ServerError::Forbidden);
+    }
+
+    let role_id = roles::create(&state.db, &name, permissions).await?;
+
+    let _ = state.channel_broadcast.send(ChannelBroadcast {
+        message: ServerMessage::RoleCreated { role_id, name, permissions },
+    });
+
+    Ok(())
+}
+
+pub async fn handle_assign(
+    session: &Session,
+    state: &Arc<AppState>,
+    user_id: Uuid,
+    role_id: Uuid,
+) -> Result<()> {
+    let caller_id = session.require_auth()?;
+    let perms     = roles::get_user_permissions(&state.db, caller_id).await?;
+    if !has_permission(perms, PermissionFlags::MANAGE_ROLES) {
+        return Err(ServerError::Forbidden);
+    }
+
+    roles::find_by_id(&state.db, role_id)
+        .await?
+        .ok_or_else(|| ServerError::NotFound("Role not found".into()))?;
+
+    roles::assign(&state.db, user_id, role_id).await?;
+
+    let _ = state.channel_broadcast.send(ChannelBroadcast {
+        message: ServerMessage::RoleAssigned { user_id, role_id },
+    });
+
+    Ok(())
+}
+
+pub async fn handle_revoke(
+    session: &Session,
+    state: &Arc<AppState>,
+    user_id: Uuid,
+    role_id: Uuid,
+) -> Result<()> {
+    let caller_id = session.require_auth()?;
+    let perms     = roles::get_user_permissions(&state.db, caller_id).await?;
+    if !has_permission(perms, PermissionFlags::MANAGE_ROLES) {
+        return Err(ServerError::Forbidden);
+    }
+
+    roles::revoke(&state.db, user_id, role_id).await?;
+
+    let _ = state.channel_broadcast.send(ChannelBroadcast {
+        message: ServerMessage::RoleRevoked { user_id, role_id },
+    });
+
+    Ok(())
+}
+
+pub async fn handle_query_key(
+    session: &Session,
+    state: &Arc<AppState>,
+    user_id: Uuid,
+) -> Result<()> {
+    session.require_auth()?;
+    let pubkey = keys::get_identity_key(&state.db, user_id).await?;
+    session.send(ServerMessage::IdentityKeyResponse { user_id, identity_pubkey: pubkey })
+}
diff --git a/backchannel-server/src/http/mod.rs b/backchannel-server/src/http/mod.rs
new file mode 100644
index 0000000..06234c7
--- /dev/null
+++ b/backchannel-server/src/http/mod.rs
@@ -0,0 +1,3 @@
+mod server;
+
+pub use server::serve;
diff --git a/backchannel-server/src/http/server.rs b/backchannel-server/src/http/server.rs
new file mode 100644
index 0000000..50947a9
--- /dev/null
+++ b/backchannel-server/src/http/server.rs
@@ -0,0 +1,65 @@
+use anyhow::{Context, Result};
+use axum::body::Body;
+use axum::extract::Path;
+use axum::http::{header, HeaderValue, StatusCode};
+use axum::response::{IntoResponse, Response};
+use axum::routing::get;
+use axum::Router;
+use mime_guess::from_path;
+use rust_embed::RustEmbed;
+
+#[derive(RustEmbed)]
+#[folder = "../backchannel-web/dist"]
+struct WebAssets;
+
+pub async fn serve(bind_addr: &str) -> Result<()> {
+    let app = Router::new()
+        .route("/", get(index))
+        .route("/*path", get(asset_or_index));
+
+    let listener = tokio::net::TcpListener::bind(bind_addr)
+        .await
+        .with_context(|| format!("Failed to bind HTTP server to {bind_addr}"))?;
+
+    tracing::info!("BackChannel web UI listening on http://{bind_addr}");
+    axum::serve(listener, app).await.context("HTTP server failed")
+}
+
+async fn index() -> Response {
+    render_asset("index.html")
+}
+
+async fn asset_or_index(Path(path): Path<String>) -> Response {
+    if path.is_empty() {
+        return render_asset("index.html");
+    }
+
+    render_asset(&path)
+}
+
+fn render_asset(path: &str) -> Response {
+    let canonical = path.trim_start_matches('/');
+
+    if let Some(content) = WebAssets::get(canonical) {
+        return build_response(canonical, content.data.as_ref(), StatusCode::OK);
+    }
+
+    if let Some(index) = WebAssets::get("index.html") {
+        return build_response("index.html", index.data.as_ref(), StatusCode::OK);
+    }
+
+    (StatusCode::NOT_FOUND, "Web UI asset not found").into_response()
+}
+
+fn build_response(path: &str, body: &[u8], status: StatusCode) -> Response {
+    let mime = from_path(path).first_or_octet_stream();
+
+    let mut response = Response::new(Body::from(body.to_vec()));
+    *response.status_mut() = status;
+    response.headers_mut().insert(
+        header::CONTENT_TYPE,
+        HeaderValue::from_str(mime.as_ref()).unwrap_or(HeaderValue::from_static("application/octet-stream")),
+    );
+
+    response
+}
diff --git a/backchannel-server/src/main.rs b/backchannel-server/src/main.rs
new file mode 100644
index 0000000..34ae2b5
--- /dev/null
+++ b/backchannel-server/src/main.rs
@@ -0,0 +1,62 @@
+mod auth;
+mod config;
+mod db;
+mod error;
+mod handlers;
+mod http;
+mod state;
+mod ws;
+
+use std::sync::Arc;
+
+use anyhow::Result;
+use sqlx::sqlite::{SqliteConnectOptions, SqlitePoolOptions};
+use std::str::FromStr;
+use tokio::sync::{broadcast, RwLock, Mutex};
+
+use state::AppState;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "backchannel_server=debug,info".into()),
+        )
+        .init();
+
+    let config = config::ServerConfig::from_env()?;
+
+    let opts = SqliteConnectOptions::from_str(&config.db_url)?.create_if_missing(true);
+    let pool = SqlitePoolOptions::new()
+        .max_connections(5)
+        .connect_with(opts)
+        .await?;
+
+    sqlx::migrate!("./src/db/migrations").run(&pool).await?;
+    tracing::info!("Database migrations applied");
+
+    let (bc_tx, _) = broadcast::channel(1024);
+
+    let state = Arc::new(AppState {
+        sessions:               RwLock::new(std::collections::HashMap::new()),
+        user_sessions:          RwLock::new(std::collections::HashMap::new()),
+        pending_key_exchanges:  Mutex::new(std::collections::HashMap::new()),
+        channel_broadcast:      bc_tx,
+        db:                     pool,
+        jwt_secret:             config.jwt_secret,
+    });
+
+    tokio::try_join!(
+        ws::listen(
+            Arc::clone(&state),
+            &config.bind_addr,
+            config.tls_enabled,
+            config.tls_cert_path,
+            config.tls_key_path,
+        ),
+        http::serve(&config.http_bind_addr)
+    )?;
+
+    Ok(())
+}
diff --git a/backchannel-server/src/state.rs b/backchannel-server/src/state.rs
new file mode 100644
index 0000000..a4aa3d2
--- /dev/null
+++ b/backchannel-server/src/state.rs
@@ -0,0 +1,123 @@
+use std::collections::HashMap;
+use std::sync::Arc;
+
+use backchannel_common::protocol::ServerMessage;
+use tokio::sync::{broadcast, mpsc, Mutex, RwLock};
+use tokio_tungstenite::tungstenite::Message as WsMessage;
+use uuid::Uuid;
+
+/// A handle to send WebSocket frames directly to one connection.
+pub type WsSender = mpsc::UnboundedSender<WsMessage>;
+
+/// State for a single authenticated WebSocket connection.
+pub struct ConnectedSession {
+    pub user_id: Uuid,
+    pub username: String,
+    /// Sending on this channel pushes a frame to the client's write task.
+    pub tx: WsSender,
+}
+
+/// A channel event broadcast to all connected clients.
+///
+/// Channel messages are fanned out via a `tokio::sync::broadcast` channel
+/// so that the handler never has to hold a lock while iterating sessions.
+#[derive(Clone, Debug)]
+pub struct ChannelBroadcast {
+    pub message: ServerMessage,
+}
+
+/// The shared application state. Wrapped in `Arc` and passed to every task.
+pub struct AppState {
+    /// All live WebSocket sessions, keyed by a per-connection UUID.
+    /// One user may hold multiple connections.
+    pub sessions: RwLock<HashMap<Uuid, ConnectedSession>>,
+
+    /// Reverse index: user_id → set of connection UUIDs.
+    /// Allows sending to all clients of a specific user (e.g. for DMs).
+    pub user_sessions: RwLock<HashMap<Uuid, Vec<Uuid>>>,
+
+    /// In-flight DM key-exchange requests.
+    /// Key: (initiator_user_id, recipient_user_id)
+    /// Value: initiator's base64 X25519 ephemeral public key.
+    /// Cleared once the recipient accepts the exchange.
+    pub pending_key_exchanges: Mutex<HashMap<(Uuid, Uuid), String>>,
+
+    /// Server-wide broadcast for channel events. Each connection handler
+    /// calls `.subscribe()` to get its own receiver.
+    pub channel_broadcast: broadcast::Sender<ChannelBroadcast>,
+
+    /// SQLite connection pool.
+    pub db: sqlx::SqlitePool,
+
+    /// Bytes used as the HMAC secret for JWT signing.
+    pub jwt_secret: Vec<u8>,
+}
+
+impl AppState {
+    /// Look up all active sender handles for a given user ID.
+    /// Used when routing DMs or presence events to a specific user.
+    pub async fn senders_for_user(&self, user_id: Uuid) -> Vec<WsSender> {
+        let sessions = self.sessions.read().await;
+        let user_sessions = self.user_sessions.read().await;
+
+        user_sessions
+            .get(&user_id)
+            .map(|conn_ids| {
+                conn_ids
+                    .iter()
+                    .filter_map(|id| sessions.get(id).map(|s| s.tx.clone()))
+                    .collect()
+            })
+            .unwrap_or_default()
+    }
+
+    /// Send a `ServerMessage` to every connection belonging to `user_id`.
+    pub async fn send_to_user(&self, user_id: Uuid, msg: &ServerMessage) {
+        if let Ok(json) = serde_json::to_string(msg) {
+            for tx in self.senders_for_user(user_id).await {
+                let _ = tx.send(WsMessage::Text(json.clone()));
+            }
+        }
+    }
+
+    /// Register a new connection in the session maps.
+    pub async fn register_session(
+        self: &Arc<Self>,
+        conn_id: Uuid,
+        user_id: Uuid,
+        username: String,
+        tx: WsSender,
+    ) {
+        let session = ConnectedSession { user_id, username, tx };
+        self.sessions.write().await.insert(conn_id, session);
+        self.user_sessions
+            .write()
+            .await
+            .entry(user_id)
+            .or_default()
+            .push(conn_id);
+    }
+
+    /// Remove a connection from the session maps.
+    pub async fn remove_session(self: &Arc<Self>, conn_id: Uuid) -> Option<ConnectedSession> {
+        let session = self.sessions.write().await.remove(&conn_id)?;
+        let mut user_sessions = self.user_sessions.write().await;
+        if let Some(ids) = user_sessions.get_mut(&session.user_id) {
+            ids.retain(|id| id != &conn_id);
+            if ids.is_empty() {
+                user_sessions.remove(&session.user_id);
+            }
+        }
+        Some(session)
+    }
+
+    /// Returns true if the given user has at least one active connection.
+    pub async fn is_user_online(&self, user_id: Uuid) -> bool {
+        self.user_sessions
+            .read()
+            .await
+            .get(&user_id)
+            .map(|v| !v.is_empty())
+            .unwrap_or(false)
+    }
+}
diff --git a/backchannel-server/src/ws/handler.rs b/backchannel-server/src/ws/handler.rs
new file mode 100644
index 0000000..ce6df78
--- /dev/null
+++ b/backchannel-server/src/ws/handler.rs
@@ -0,0 +1,179 @@
+use std::io::BufReader;
+use std::net::SocketAddr;
+use std::sync::Arc;
+
+use anyhow::{Context, Result};
+use futures_util::{SinkExt, StreamExt};
+use tokio::net::TcpListener;
+use tokio::sync::{broadcast, mpsc};
+use tokio_tungstenite::{accept_async, tungstenite::Message as WsMessage, WebSocketStream};
+
+use backchannel_common::protocol::{ClientMessage, ServerMessage};
+
+use crate::state::{AppState, ChannelBroadcast};
+use crate::ws::{router, session::Session};
+
+/// Bind the TCP listener and accept connections in a loop.
+pub async fn run(
+    state: Arc<AppState>,
+    bind_addr: &str,
+    tls_enabled: bool,
+    tls_cert_path: Option<String>,
+    tls_key_path: Option<String>,
+) -> Result<()> {
+    let listener = TcpListener::bind(bind_addr)
+        .await
+        .with_context(|| format!("Failed to bind to {}", bind_addr))?;
+
+    tracing::info!("BackChannel server listening on ws{}://{}", if tls_enabled { "s" } else { "" }, bind_addr);
+
+    if tls_enabled {
+        let cert_path = tls_cert_path.expect("tls_cert_path required when TLS enabled");
+        let key_path  = tls_key_path.expect("tls_key_path required when TLS enabled");
+        let acceptor = build_tls_acceptor(&cert_path, &key_path)?;
+
+        loop {
+            let (stream, addr) = listener.accept().await?;
+            let state    = Arc::clone(&state);
+            let acceptor = acceptor.clone();
+
+            tokio::spawn(async move {
+                match acceptor.accept(stream).await {
+                    Ok(tls_stream) => match accept_async(tls_stream).await {
+                        Ok(ws)  => handle_ws(ws, state, addr).await,
+                        Err(e)  => tracing::debug!("WS handshake failed from {}: {}", addr, e),
+                    },
+                    Err(e) => tracing::debug!("TLS handshake failed from {}: {}", addr, e),
+                }
+            });
+        }
+    } else {
+        loop {
+            let (stream, addr) = listener.accept().await?;
+            let state = Arc::clone(&state);
+
+            tokio::spawn(async move {
+                match accept_async(stream).await {
+                    Ok(ws)  => handle_ws(ws, state, addr).await,
+                    Err(e)  => tracing::debug!("WS handshake failed from {}: {}", addr, e),
+                }
+            });
+        }
+    }
+}
+
+/// Per-connection WebSocket handler — generic over the underlying stream type
+/// so it works with both plain TCP and TLS.
+async fn handle_ws<S>(ws_stream: WebSocketStream<S>, state: Arc<AppState>, addr: SocketAddr)
+where
+    S: tokio::io::AsyncRead + tokio::io::AsyncWrite + Unpin + Send + 'static,
+{
+    tracing::debug!("Connection established from {}", addr);
+    let (mut ws_sink, mut ws_source) = ws_stream.split();
+
+    // Per-connection mpsc: any task can push to this sender; the write task
+    // drains it to the WebSocket sink.
+    let (tx, mut rx) = mpsc::unbounded_channel::<WsMessage>();
+
+    let mut session = Session::new(tx);
+    let conn_id = session.conn_id;
+
+    // Subscribe to the server-wide channel broadcast before the loop starts.
+    let mut bc_rx = state.channel_broadcast.subscribe();
+
+    // Write task: merges direct messages (mpsc) + broadcast events → WS sink.
+    let write_task = tokio::spawn(async move {
+        loop {
+            tokio::select! {
+                msg = rx.recv() => {
+                    match msg {
+                        Some(m) => { if ws_sink.send(m).await.is_err() { break; } }
+                        None    => break,
+                    }
+                }
+                event = bc_rx.recv() => {
+                    match event {
+                        Ok(ChannelBroadcast { message }) => {
+                            if let Ok(json) = serde_json::to_string(&message) {
+                                if ws_sink.send(WsMessage::Text(json)).await.is_err() { break; }
+                            }
+                        }
+                        Err(broadcast::error::RecvError::Lagged(n)) => {
+                            tracing::warn!("conn {} lagged by {} broadcast messages", conn_id, n);
+                        }
+                        Err(broadcast::error::RecvError::Closed) => break,
+                    }
+                }
+            }
+        }
+    });
+
+    // Read loop: receive, deserialize, dispatch.
+    while let Some(msg_result) = ws_source.next().await {
+        match msg_result {
+            Ok(WsMessage::Text(text)) => {
+                match serde_json::from_str::<ClientMessage>(&text) {
+                    Ok(client_msg) => {
+                        if let Err(e) = router::route(client_msg, &mut session, &state).await {
+                            let _ = session.send(ServerMessage::Error {
+                                code: e.code(),
+                                message: e.to_string(),
+                            });
+                        }
+                    }
+                    Err(_) => {
+                        let _ = session.send(ServerMessage::Error {
+                            code: 400,
+                            message: "Invalid message format".into(),
+                        });
+                    }
+                }
+            }
+            Ok(WsMessage::Close(_)) | Err(_) => break,
+            Ok(_) => {} // Ignore Ping/Pong/Binary frames.
+        }
+    }
+
+    tracing::debug!("Connection closed from {}", addr);
+
+    // Clean up session maps and broadcast offline status.
+    if let Some(removed) = state.remove_session(conn_id).await {
+        if !state.is_user_online(removed.user_id).await {
+            let _ = state.channel_broadcast.send(ChannelBroadcast {
+                message: ServerMessage::UserOffline {
+                    user_id: removed.user_id,
+                    username: removed.username,
+                },
+            });
+        }
+    }
+
+    write_task.abort();
+}
+
+/// Build a `tokio_rustls::TlsAcceptor` from PEM cert and key files.
+fn build_tls_acceptor(cert_path: &str, key_path: &str) -> Result<tokio_rustls::TlsAcceptor> {
+    use rustls::ServerConfig;
+    use rustls_pemfile::{certs, private_key};
+    use std::fs::File;
+
+    let cert_file = File::open(cert_path)
+        .with_context(|| format!("Cannot open TLS cert: {}", cert_path))?;
+    let key_file  = File::open(key_path)
+        .with_context(|| format!("Cannot open TLS key: {}", key_path))?;
+
+    let certs: Vec<_> = certs(&mut BufReader::new(cert_file))
+        .collect::<std::result::Result<_, _>>()
+        .context("Failed to parse TLS certificates")?;
+
+    let key = private_key(&mut BufReader::new(key_file))
+        .context("Failed to parse TLS private key")?
+        .context("No private key found in key file")?;
+
+    let config = ServerConfig::builder()
+        .with_no_client_auth()
+        .with_single_cert(certs, key)
+        .context("Invalid TLS certificate/key combination")?;
+
+    Ok(tokio_rustls::TlsAcceptor::from(Arc::new(config)))
+}
diff --git a/backchannel-server/src/ws/mod.rs b/backchannel-server/src/ws/mod.rs
new file mode 100644
index 0000000..23a08f6
--- /dev/null
+++ b/backchannel-server/src/ws/mod.rs
@@ -0,0 +1,18 @@
+pub mod handler;
+pub mod router;
+pub mod session;
+
+use std::sync::Arc;
+use anyhow::Result;
+use crate::state::AppState;
+
+/// Bind the TCP listener and accept WebSocket connections.
+pub async fn listen(
+    state: Arc<AppState>,
+    bind_addr: &str,
+    tls_enabled: bool,
+    tls_cert_path: Option<String>,
+    tls_key_path: Option<String>,
+) -> Result<()> {
+    handler::run(state, bind_addr, tls_enabled, tls_cert_path, tls_key_path).await
+}
diff --git a/backchannel-server/src/ws/router.rs b/backchannel-server/src/ws/router.rs
new file mode 100644
index 0000000..a6fcf61
--- /dev/null
+++ b/backchannel-server/src/ws/router.rs
@@ -0,0 +1,64 @@
+use std::sync::Arc;
+
+use backchannel_common::protocol::{ClientMessage, ServerMessage};
+
+use crate::error::Result;
+use crate::handlers;
+use crate::state::AppState;
+use crate::ws::session::Session;
+
+/// Dispatch a `ClientMessage` to the appropriate handler.
+pub async fn route(msg: ClientMessage, session: &mut Session, state: &Arc<AppState>) -> Result<()> {
+    use ClientMessage::*;
+    match msg {
+        Login { username, password, identity_pubkey } => {
+            handlers::auth::handle_login(session, state, username, password, identity_pubkey).await
+        }
+        Register { username, password, identity_pubkey } => {
+            handlers::auth::handle_register(session, state, username, password, identity_pubkey).await
+        }
+        ResumeSession { token } => {
+            handlers::auth::handle_resume(session, state, token).await
+        }
+        Logout => {
+            handlers::auth::handle_logout(session, state).await
+        }
+        SendChannelMessage { channel_id, content } => {
+            handlers::channels::handle_send(session, state, channel_id, content).await
+        }
+        FetchChannelHistory { channel_id, before_message_id, limit } => {
+            handlers::channels::handle_history(session, state, channel_id, before_message_id, limit).await
+        }
+        CreateChannel { name, topic } => {
+            handlers::channels::handle_create(session, state, name, topic).await
+        }
+        DeleteChannel { channel_id } => {
+            handlers::channels::handle_delete(session, state, channel_id).await
+        }
+        InitDmKeyExchange { recipient_id, sender_ephemeral_pubkey } => {
+            handlers::dms::handle_init_key_exchange(session, state, recipient_id, sender_ephemeral_pubkey).await
+        }
+        AcceptDmKeyExchange { initiator_id, recipient_ephemeral_pubkey } => {
+            handlers::dms::handle_accept_key_exchange(session, state, initiator_id, recipient_ephemeral_pubkey).await
+        }
+        SendDm { recipient_id, ciphertext, nonce } => {
+            handlers::dms::handle_send_dm(session, state, recipient_id, ciphertext, nonce).await
+        }
+        FetchDmHistory { peer_id, before_message_id, limit } => {
+            handlers::dms::handle_dm_history(session, state, peer_id, before_message_id, limit).await
+        }
+        CreateRole { name, permissions } => {
+            handlers::roles::handle_create(session, state, name, permissions).await
+        }
+        AssignRole { user_id, role_id } => {
+            handlers::roles::handle_assign(session, state, user_id, role_id).await
+        }
+        RevokeRole { user_id, role_id } => {
+            handlers::roles::handle_revoke(session, state, user_id, role_id).await
+        }
+        QueryIdentityKey { user_id } => {
+            handlers::roles::handle_query_key(session, state, user_id).await
+        }
+        Ping => session.send(ServerMessage::Pong),
+    }
+}
diff --git a/backchannel-server/src/ws/session.rs b/backchannel-server/src/ws/session.rs
new file mode 100644
index 0000000..6ea7e6c
--- /dev/null
+++ b/backchannel-server/src/ws/session.rs
@@ -0,0 +1,45 @@
+use backchannel_common::protocol::ServerMessage;
+use tokio_tungstenite::tungstenite::Message as WsMessage;
+use uuid::Uuid;
+
+use crate::error::{Result, ServerError};
+use crate::state::WsSender;
+
+/// Per-connection mutable state, owned exclusively by the connection's read task.
+pub struct Session {
+    pub conn_id: Uuid,
+    pub user_id: Option<Uuid>,
+    pub username: Option<String>,
+    /// JWT ID stored for revocation on logout.
+    pub jti: Option<String>,
+    /// Sender to the write task for this connection.
+    pub tx: WsSender,
+}
+
+impl Session {
+    pub fn new(tx: WsSender) -> Self {
+        Self {
+            conn_id: Uuid::new_v4(),
+            user_id: None,
+            username: None,
+            jti: None,
+            tx,
+        }
+    }
+
+    /// Serialize and send a `ServerMessage` to this connection's write task.
+    pub fn send(&self, msg: ServerMessage) -> Result<()> {
+        let json = serde_json::to_string(&msg)?;
+        self.tx
+            .send(WsMessage::Text(json))
+            .map_err(|_| ServerError::ConnectionClosed)
+    }
+
+    pub fn require_auth(&self) -> Result<Uuid> {
+        self.user_id.ok_or(ServerError::Unauthorized)
+    }
+
+    pub fn require_username(&self) -> Result<&str> {
+        self.username.as_deref().ok_or(ServerError::Unauthorized)
+    }
+}
diff --git a/backchannel-web/README.md b/backchannel-web/README.md
new file mode 100644
index 0000000..7102159
--- /dev/null
+++ b/backchannel-web/README.md
@@ -0,0 +1,24 @@
+# BackChannel Web
+
+React + TypeScript browser client for BackChannel.
+
+## Development
+
+```powershell
+cd backchannel-web
+npm install
+npm run dev
+```
+
+Default WebSocket target in the app is `ws://<host>:7777` and can be changed from the UI.
+
+## Build for Embedded Server
+
+```powershell
+cd backchannel-web
+npm install
+npm run build
+```
+
+The Rust server embeds files from `backchannel-web/dist` at compile time.
+Rebuild the Rust server after producing a new web build.
diff --git a/backchannel-web/dist/assets/index-C3Y0u3Sh.css b/backchannel-web/dist/assets/index-C3Y0u3Sh.css
new file mode 100644
index 0000000..49ca07e
--- /dev/null
+++ b/backchannel-web/dist/assets/index-C3Y0u3Sh.css
@@ -0,0 +1 @@
+:root{color-scheme:light;--bg-0: #0d1b2a;--panel: #fffaf0;--text: #1d2d44;--accent: #e76f51;--accent-2: #2a9d8f;--line: #f4a261}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at top left,#415a77,var(--bg-0) 55%);font-family:Space Grotesk,Trebuchet MS,sans-serif;color:var(--text)}.layout{width:min(1400px,100vw);margin:0 auto;padding:20px;display:grid;gap:14px}.card{background:linear-gradient(145deg,#fffaf0,#fdf0d5);border:2px solid #e9c46a;border-radius:16px;box-shadow:0 8px 24px #0003}.topbar{padding:16px;display:flex;flex-wrap:wrap;justify-content:space-between;align-items:end;gap:12px}h1{margin:0;font-family:Bebas Neue,Impact,sans-serif;letter-spacing:.06em;font-size:clamp(2rem,4vw,2.8rem)}h2{margin:0;font-family:Bebas Neue,Impact,sans-serif;letter-spacing:.05em}p{margin:6px 0 0}.connection{display:flex;gap:8px;min-width:min(540px,100%)}.status{padding:10px 14px;font-weight:700;border-color:var(--accent-2)}.chat-shell{position:relative;padding-left:350px}.panel{padding:14px;display:grid;gap:10px}.chat-main{min-height:calc(100vh - 220px)}.auth-sidebar{position:fixed;left:20px;bottom:20px;width:320px;z-index:10}.switch{display:flex;gap:8px}.switch .active{background:var(--accent-2);color:#fff}input{width:100%;border:2px solid #264653;border-radius:10px;padding:8px 10px;font:inherit;background:#fff}form{display:grid;gap:8px}button{border:0;background:var(--accent);color:#fff;border-radius:10px;padding:8px 10px;cursor:pointer;font-weight:700}.chat-main form{grid-template-columns:1fr auto;align-items:end}.send-button{padding:6px 10px;min-width:68px}button:disabled{opacity:.5;cursor:not-allowed}.meta{display:grid;gap:6px;font-size:.9rem}.log{background:#fff;border:1px solid var(--line);border-radius:10px;min-height:200px;overflow-y:auto;padding:8px;display:flex;flex-direction:column;justify-content:flex-end;gap:6px}.chat-log{max-height:calc(100vh - 360px)}.line{display:grid;gap:2px;border-bottom:1px dashed #c8d4dd;padding-bottom:6px}time{font-size:.75rem;color:#526072}@media (max-width: 900px){.chat-shell{padding-left:0}.auth-sidebar{position:static;width:100%;margin-top:14px}.chat-main{min-height:auto}.chat-log{max-height:50vh}.connection{min-width:0;width:100%;flex-direction:column}}
diff --git a/backchannel-web/dist/assets/index-DEokFOhy.js b/backchannel-web/dist/assets/index-DEokFOhy.js
new file mode 100644
index 0000000..5006d28
--- /dev/null
+++ b/backchannel-web/dist/assets/index-DEokFOhy.js
@@ -0,0 +1,40 @@
+(function(){const t=document.createElement("link").relList;if(t&&t.supports&&t.supports("modulepreload"))return;for(const l of document.querySelectorAll('link[rel="modulepreload"]'))r(l);new MutationObserver(l=>{for(const u of l)if(u.type==="childList")for(const o of u.addedNodes)o.tagName==="LINK"&&o.rel==="modulepreload"&&r(o)}).observe(document,{childList:!0,subtree:!0});function n(l){const u={};return l.integrity&&(u.integrity=l.integrity),l.referrerPolicy&&(u.referrerPolicy=l.referrerPolicy),l.crossOrigin==="use-credentials"?u.credentials="include":l.crossOrigin==="anonymous"?u.credentials="omit":u.credentials="same-origin",u}function r(l){if(l.ep)return;l.ep=!0;const u=n(l);fetch(l.href,u)}})();function lc(e){return e&&e.__esModule&&Object.prototype.hasOwnProperty.call(e,"default")?e.default:e}var Qi={exports:{}},nl={},Ki={exports:{}},R={};/**
+ * @license React
+ * react.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
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diff --git a/backchannel-web/dist/index.html b/backchannel-web/dist/index.html
new file mode 100644
index 0000000..fecf2e3
--- /dev/null
+++ b/backchannel-web/dist/index.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>BackChannel</title>
+    <script type="module" crossorigin src="/assets/index-DEokFOhy.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-C3Y0u3Sh.css">
+  </head>
+  <body>
+    <div id="root"></div>
+  </body>
+</html>
diff --git a/backchannel-web/index.html b/backchannel-web/index.html
new file mode 100644
index 0000000..cc0f645
--- /dev/null
+++ b/backchannel-web/index.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>BackChannel</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>
diff --git a/backchannel-web/package-lock.json b/backchannel-web/package-lock.json
new file mode 100644
index 0000000..01b9843
--- /dev/null
+++ b/backchannel-web/package-lock.json
@@ -0,0 +1,1768 @@
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+      }
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+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
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+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/update-browserslist-db": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.2.3.tgz",
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+      "dev": true,
+      "funding": [
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/browserslist"
+        },
+        {
+          "type": "tidelift",
+          "url": "https://tidelift.com/funding/github/npm/browserslist"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "escalade": "^3.2.0",
+        "picocolors": "^1.1.1"
+      },
+      "bin": {
+        "update-browserslist-db": "cli.js"
+      },
+      "peerDependencies": {
+        "browserslist": ">= 4.21.0"
+      }
+    },
+    "node_modules/vite": {
+      "version": "5.4.21",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-5.4.21.tgz",
+      "integrity": "sha512-o5a9xKjbtuhY6Bi5S3+HvbRERmouabWbyUcpXXUA1u+GNUKoROi9byOJ8M0nHbHYHkYICiMlqxkg1KkYmm25Sw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "^0.21.3",
+        "postcss": "^8.4.43",
+        "rollup": "^4.20.0"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^18.0.0 || >=20.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^18.0.0 || >=20.0.0",
+        "less": "*",
+        "lightningcss": "^1.21.0",
+        "sass": "*",
+        "sass-embedded": "*",
+        "stylus": "*",
+        "sugarss": "*",
+        "terser": "^5.4.0"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "lightningcss": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/yallist": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
+      "dev": true,
+      "license": "ISC"
+    }
+  }
+}
diff --git a/backchannel-web/package.json b/backchannel-web/package.json
new file mode 100644
index 0000000..2028322
--- /dev/null
+++ b/backchannel-web/package.json
@@ -0,0 +1,25 @@
+{
+  "name": "backchannel-web",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@noble/ciphers": "^1.3.0",
+    "@noble/curves": "^1.8.0",
+    "@noble/hashes": "^1.8.0",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1"
+  },
+  "devDependencies": {
+    "@types/react": "^18.3.11",
+    "@types/react-dom": "^18.3.0",
+    "@vitejs/plugin-react": "^4.3.2",
+    "typescript": "^5.6.3",
+    "vite": "^5.4.8"
+  }
+}
diff --git a/backchannel-web/src/App.tsx b/backchannel-web/src/App.tsx
new file mode 100644
index 0000000..ae894e6
--- /dev/null
+++ b/backchannel-web/src/App.tsx
@@ -0,0 +1,236 @@
+import { FormEvent, useEffect, useMemo, useRef, useState } from "react";
+
+import { getOrCreateIdentityKey } from "./crypto";
+import { ClientMessage, GENERAL_CHANNEL_ID, ServerMessage } from "./protocol";
+
+type ChatLine = { id: string; by: string; text: string; at: string };
+
+function parseServerMessage(raw: unknown): ServerMessage | null {
+  if (!raw || typeof raw !== "object") {
+    return null;
+  }
+
+  const candidate = raw as { type?: unknown };
+  if (typeof candidate.type !== "string") {
+    return null;
+  }
+
+  return raw as ServerMessage;
+}
+
+function defaultWsUrl(): string {
+  const host = window.location.hostname || "127.0.0.1";
+  return `ws://${host}:7777`;
+}
+
+export function App() {
+  const [wsUrl, setWsUrl] = useState(() => localStorage.getItem("bc.ws_url") ?? defaultWsUrl());
+  const [socketState, setSocketState] = useState<"offline" | "connecting" | "online">("offline");
+  const [authMode, setAuthMode] = useState<"login" | "register">("login");
+
+  const [username, setUsername] = useState("");
+  const [password, setPassword] = useState("");
+
+  const [me, setMe] = useState<{ id: string; username: string } | null>(null);
+  const [channelInput, setChannelInput] = useState("");
+  const [channelLines, setChannelLines] = useState<ChatLine[]>([]);
+
+  const [status, setStatus] = useState("Not connected");
+
+  const wsRef = useRef<WebSocket | null>(null);
+  const chatLogRef = useRef<HTMLDivElement | null>(null);
+
+  const ready = useMemo(() => socketState === "online", [socketState]);
+
+  useEffect(() => {
+    if (chatLogRef.current) {
+      chatLogRef.current.scrollTop = chatLogRef.current.scrollHeight;
+    }
+  }, [channelLines]);
+
+  function formatTime(timestamp: string): string {
+    return new Date(timestamp).toLocaleTimeString([], {
+      hour: "numeric",
+      minute: "2-digit",
+    });
+  }
+
+  function send(message: ClientMessage) {
+    const ws = wsRef.current;
+    if (!ws || ws.readyState !== WebSocket.OPEN) {
+      setStatus("WebSocket is not connected");
+      return;
+    }
+    ws.send(JSON.stringify(message));
+  }
+
+  function connect() {
+    if (wsRef.current && wsRef.current.readyState <= WebSocket.OPEN) {
+      return;
+    }
+
+    setSocketState("connecting");
+    setStatus("Connecting...");
+    localStorage.setItem("bc.ws_url", wsUrl);
+
+    const ws = new WebSocket(wsUrl);
+    wsRef.current = ws;
+
+    ws.onopen = () => {
+      setSocketState("online");
+      setStatus("Connected");
+
+      const token = localStorage.getItem("bc.session_token");
+      if (token) {
+        send({ type: "resume_session", token });
+      } else {
+        setStatus("Connected. Please login or register.");
+      }
+    };
+
+    ws.onclose = () => {
+      setSocketState("offline");
+      setStatus("Disconnected");
+      wsRef.current = null;
+    };
+
+    ws.onerror = () => {
+      setStatus("WebSocket error");
+    };
+
+    ws.onmessage = (event) => {
+      const msg = parseServerMessage(JSON.parse(event.data));
+      if (!msg) {
+        setStatus("Invalid server message");
+        return;
+      }
+      handleServer(msg);
+    };
+  }
+
+  function handleServer(msg: ServerMessage) {
+    switch (msg.type) {
+      case "auth_success": {
+        localStorage.setItem("bc.session_token", msg.session_token);
+        setMe({ id: msg.user_id, username: msg.username });
+        setStatus(`Authenticated as ${msg.username}`);
+        send({ type: "fetch_channel_history", channel_id: GENERAL_CHANNEL_ID, before_message_id: null, limit: 100 });
+        return;
+      }
+      case "auth_error": {
+        setStatus(`Auth error: ${msg.reason}`);
+        return;
+      }
+      case "channel_history": {
+        setChannelLines(
+          [...msg.messages]
+            .reverse()
+            .map((m) => ({ id: m.message_id, by: m.author_username, text: m.content, at: m.timestamp })),
+        );
+        return;
+      }
+      case "channel_message": {
+        if (msg.channel_id === GENERAL_CHANNEL_ID) {
+          setChannelLines((prev) => [
+            ...prev,
+            { id: msg.message_id, by: msg.author_username, text: msg.content, at: msg.timestamp },
+          ]);
+        }
+        return;
+      }
+      case "error": {
+        setStatus(`Error ${msg.code}: ${msg.message}`);
+        return;
+      }
+      default:
+        return;
+    }
+  }
+
+  function submitAuth(event: FormEvent) {
+    event.preventDefault();
+    const identity = getOrCreateIdentityKey();
+
+    if (authMode === "login") {
+      send({ type: "login", username, password, identity_pubkey: identity });
+      return;
+    }
+
+    send({ type: "register", username, password, identity_pubkey: identity });
+  }
+
+  function submitChannel(event: FormEvent) {
+    event.preventDefault();
+    if (!channelInput.trim()) {
+      return;
+    }
+
+    send({ type: "send_channel_message", channel_id: GENERAL_CHANNEL_ID, content: channelInput.trim() });
+    setChannelInput("");
+  }
+
+  function logout() {
+    send({ type: "logout" });
+    localStorage.removeItem("bc.session_token");
+    setMe(null);
+    setStatus("Logged out");
+  }
+
+  return (
+    <main className="layout">
+      <section className="card topbar">
+        <div>
+          <h1>BackChannel</h1>
+          <p>General chat room.</p>
+        </div>
+
+        <div className="connection">
+          <input value={wsUrl} onChange={(e) => setWsUrl(e.target.value)} placeholder="ws://127.0.0.1:7777" />
+          <button onClick={connect} disabled={ready}>Connect</button>
+        </div>
+      </section>
+
+      <section className="card status">{status}</section>
+
+      <section className="chat-shell">
+        <article className="card panel chat-main">
+          <h2>#general</h2>
+          <form onSubmit={submitChannel}>
+            <input value={channelInput} onChange={(e) => setChannelInput(e.target.value)} placeholder="message #general" />
+            <button className="send-button" type="submit" disabled={!ready}>Send</button>
+          </form>
+
+          <div ref={chatLogRef} className="log chat-log">
+            {channelLines.map((line) => (
+              <div key={line.id} className="line">
+                <b>{line.by}</b>
+                <span>{line.text}</span>
+                <time>{formatTime(line.at)}</time>
+              </div>
+            ))}
+          </div>
+        </article>
+
+        <aside className="card panel auth-sidebar">
+          <h2>Auth</h2>
+          <div className="switch">
+            <button className={authMode === "login" ? "active" : ""} onClick={() => setAuthMode("login")}>Login</button>
+            <button className={authMode === "register" ? "active" : ""} onClick={() => setAuthMode("register")}>Register</button>
+          </div>
+
+          <form onSubmit={submitAuth}>
+            <input value={username} onChange={(e) => setUsername(e.target.value)} placeholder="username" />
+            <input value={password} onChange={(e) => setPassword(e.target.value)} placeholder="password" type="password" />
+            <button type="submit" disabled={!ready}>{authMode}</button>
+          </form>
+
+          <div className="meta">
+            <div>User: {me?.username ?? "(not authenticated)"}</div>
+            <div>ID: {me?.id ?? "-"}</div>
+            <button onClick={logout} disabled={!ready}>Logout</button>
+          </div>
+        </aside>
+      </section>
+    </main>
+  );
+}
diff --git a/backchannel-web/src/crypto.ts b/backchannel-web/src/crypto.ts
new file mode 100644
index 0000000..2084dfb
--- /dev/null
+++ b/backchannel-web/src/crypto.ts
@@ -0,0 +1,69 @@
+import { chacha20poly1305 } from "@noble/ciphers/chacha";
+import { x25519 } from "@noble/curves/ed25519";
+import { hkdf } from "@noble/hashes/hkdf";
+import { sha256 } from "@noble/hashes/sha256";
+import { randomBytes } from "@noble/hashes/utils";
+
+const HKDF_SALT = new TextEncoder().encode("backchannel-dm-salt-v1");
+const HKDF_INFO = new TextEncoder().encode("backchannel-dm-key-v1");
+
+const encoder = new TextEncoder();
+const decoder = new TextDecoder();
+
+export function bytesToBase64(input: Uint8Array): string {
+  let bin = "";
+  for (const b of input) {
+    bin += String.fromCharCode(b);
+  }
+  return btoa(bin);
+}
+
+export function base64ToBytes(input: string): Uint8Array {
+  const bin = atob(input);
+  const bytes = new Uint8Array(bin.length);
+  for (let i = 0; i < bin.length; i += 1) {
+    bytes[i] = bin.charCodeAt(i);
+  }
+  return bytes;
+}
+
+export function getOrCreateIdentityKey(): string {
+  const current = localStorage.getItem("bc.identity_key");
+  if (current) {
+    return current;
+  }
+
+  const key = bytesToBase64(randomBytes(32));
+  localStorage.setItem("bc.identity_key", key);
+  return key;
+}
+
+export function createEphemeralKeypair(): { privateKey: Uint8Array; publicKeyB64: string } {
+  const privateKey = x25519.utils.randomPrivateKey();
+  const publicKey = x25519.getPublicKey(privateKey);
+  return { privateKey, publicKeyB64: bytesToBase64(publicKey) };
+}
+
+export function deriveDmKey(privateKey: Uint8Array, theirPublicKeyB64: string): Uint8Array {
+  const theirPublicKey = base64ToBytes(theirPublicKeyB64);
+  const sharedSecret = x25519.getSharedSecret(privateKey, theirPublicKey);
+  return hkdf(sha256, sharedSecret, HKDF_SALT, HKDF_INFO, 32);
+}
+
+export function encryptDm(key: Uint8Array, plaintext: string): { nonce: string; ciphertext: string } {
+  const nonceBytes = randomBytes(12);
+  const cipher = chacha20poly1305(key, nonceBytes);
+  const ciphertext = cipher.encrypt(encoder.encode(plaintext));
+  return {
+    nonce: bytesToBase64(nonceBytes),
+    ciphertext: bytesToBase64(ciphertext),
+  };
+}
+
+export function decryptDm(key: Uint8Array, nonceB64: string, ciphertextB64: string): string {
+  const nonceBytes = base64ToBytes(nonceB64);
+  const ciphertext = base64ToBytes(ciphertextB64);
+  const cipher = chacha20poly1305(key, nonceBytes);
+  const plaintext = cipher.decrypt(ciphertext);
+  return decoder.decode(plaintext);
+}
diff --git a/backchannel-web/src/main.tsx b/backchannel-web/src/main.tsx
new file mode 100644
index 0000000..181f392
--- /dev/null
+++ b/backchannel-web/src/main.tsx
@@ -0,0 +1,11 @@
+import React from "react";
+import ReactDOM from "react-dom/client";
+
+import { App } from "./App";
+import "./styles.css";
+
+ReactDOM.createRoot(document.getElementById("root")!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+);
diff --git a/backchannel-web/src/protocol.ts b/backchannel-web/src/protocol.ts
new file mode 100644
index 0000000..c1ba103
--- /dev/null
+++ b/backchannel-web/src/protocol.ts
@@ -0,0 +1,72 @@
+export const GENERAL_CHANNEL_ID = "00000000-0000-0000-0000-000000000010";
+
+export type ClientMessage =
+  | { type: "login"; username: string; password: string; identity_pubkey: string }
+  | { type: "register"; username: string; password: string; identity_pubkey: string }
+  | { type: "resume_session"; token: string }
+  | { type: "logout" }
+  | { type: "send_channel_message"; channel_id: string; content: string }
+  | { type: "fetch_channel_history"; channel_id: string; before_message_id: string | null; limit: number }
+  | { type: "init_dm_key_exchange"; recipient_id: string; sender_ephemeral_pubkey: string }
+  | { type: "accept_dm_key_exchange"; initiator_id: string; recipient_ephemeral_pubkey: string }
+  | { type: "send_dm"; recipient_id: string; ciphertext: string; nonce: string }
+  | { type: "fetch_dm_history"; peer_id: string; before_message_id: string | null; limit: number }
+  | { type: "ping" };
+
+export type ServerMessage =
+  | { type: "auth_success"; user_id: string; username: string; session_token: string }
+  | { type: "auth_error"; reason: string }
+  | {
+      type: "channel_message";
+      message_id: string;
+      channel_id: string;
+      author_id: string;
+      author_username: string;
+      content: string;
+      timestamp: string;
+    }
+  | {
+      type: "channel_history";
+      channel_id: string;
+      messages: Array<{
+        message_id: string;
+        author_id: string;
+        author_username: string;
+        content: string;
+        timestamp: string;
+      }>;
+    }
+  | {
+      type: "dm_key_exchange_request";
+      initiator_id: string;
+      initiator_username: string;
+      sender_ephemeral_pubkey: string;
+    }
+  | {
+      type: "dm_key_exchange_response";
+      recipient_id: string;
+      recipient_username: string;
+      recipient_ephemeral_pubkey: string;
+    }
+  | {
+      type: "direct_message";
+      message_id: string;
+      sender_id: string;
+      sender_username: string;
+      ciphertext: string;
+      nonce: string;
+      timestamp: string;
+    }
+  | {
+      type: "dm_history";
+      peer_id: string;
+      messages: Array<{
+        message_id: string;
+        sender_id: string;
+        ciphertext: string;
+        nonce: string;
+        timestamp: string;
+      }>;
+    }
+  | { type: "error"; code: number; message: string }
+  | { type: "pong" };
diff --git a/backchannel-web/src/styles.css b/backchannel-web/src/styles.css
new file mode 100644
index 0000000..1757999
--- /dev/null
+++ b/backchannel-web/src/styles.css
@@ -0,0 +1,207 @@
+:root {
+  color-scheme: light;
+  --bg-0: #0d1b2a;
+  --panel: #fffaf0;
+  --text: #1d2d44;
+  --accent: #e76f51;
+  --accent-2: #2a9d8f;
+  --line: #f4a261;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  min-height: 100vh;
+  background: radial-gradient(circle at top left, #415a77, var(--bg-0) 55%);
+  font-family: "Space Grotesk", "Trebuchet MS", sans-serif;
+  color: var(--text);
+}
+
+.layout {
+  width: min(1400px, 100vw);
+  margin: 0 auto;
+  padding: 20px;
+  display: grid;
+  gap: 14px;
+}
+
+.card {
+  background: linear-gradient(145deg, #fffaf0, #fdf0d5);
+  border: 2px solid #e9c46a;
+  border-radius: 16px;
+  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
+}
+
+.topbar {
+  padding: 16px;
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: space-between;
+  align-items: end;
+  gap: 12px;
+}
+
+h1 {
+  margin: 0;
+  font-family: "Bebas Neue", "Impact", sans-serif;
+  letter-spacing: 0.06em;
+  font-size: clamp(2rem, 4vw, 2.8rem);
+}
+
+h2 {
+  margin: 0;
+  font-family: "Bebas Neue", "Impact", sans-serif;
+  letter-spacing: 0.05em;
+}
+
+p {
+  margin: 6px 0 0;
+}
+
+.connection {
+  display: flex;
+  gap: 8px;
+  min-width: min(540px, 100%);
+}
+
+.status {
+  padding: 10px 14px;
+  font-weight: 700;
+  border-color: var(--accent-2);
+}
+
+.chat-shell {
+  position: relative;
+  padding-left: 350px;
+}
+
+.panel {
+  padding: 14px;
+  display: grid;
+  gap: 10px;
+}
+
+.chat-main {
+  min-height: calc(100vh - 220px);
+}
+
+.auth-sidebar {
+  position: fixed;
+  left: 20px;
+  bottom: 20px;
+  width: 320px;
+  z-index: 10;
+}
+
+.switch {
+  display: flex;
+  gap: 8px;
+}
+
+.switch .active {
+  background: var(--accent-2);
+  color: white;
+}
+
+input {
+  width: 100%;
+  border: 2px solid #264653;
+  border-radius: 10px;
+  padding: 8px 10px;
+  font: inherit;
+  background: #fff;
+}
+
+form {
+  display: grid;
+  gap: 8px;
+}
+
+button {
+  border: 0;
+  background: var(--accent);
+  color: #fff;
+  border-radius: 10px;
+  padding: 8px 10px;
+  cursor: pointer;
+  font-weight: 700;
+}
+
+.chat-main form {
+  grid-template-columns: 1fr auto;
+  align-items: end;
+}
+
+.send-button {
+  padding: 6px 10px;
+  min-width: 68px;
+}
+
+button:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.meta {
+  display: grid;
+  gap: 6px;
+  font-size: 0.9rem;
+}
+
+.log {
+  background: #fff;
+  border: 1px solid var(--line);
+  border-radius: 10px;
+  min-height: 200px;
+  overflow-y: auto;
+  padding: 8px;
+  display: flex;
+  flex-direction: column;
+  justify-content: flex-end;
+  gap: 6px;
+}
+
+.chat-log {
+  max-height: calc(100vh - 360px);
+}
+
+.line {
+  display: grid;
+  gap: 2px;
+  border-bottom: 1px dashed #c8d4dd;
+  padding-bottom: 6px;
+}
+
+time {
+  font-size: 0.75rem;
+  color: #526072;
+}
+
+@media (max-width: 900px) {
+  .chat-shell {
+    padding-left: 0;
+  }
+
+  .auth-sidebar {
+    position: static;
+    width: 100%;
+    margin-top: 14px;
+  }
+
+  .chat-main {
+    min-height: auto;
+  }
+
+  .chat-log {
+    max-height: 50vh;
+  }
+
+  .connection {
+    min-width: 0;
+    width: 100%;
+    flex-direction: column;
+  }
+}
diff --git a/backchannel-web/src/vite-env.d.ts b/backchannel-web/src/vite-env.d.ts
new file mode 100644
index 0000000..11f02fe
--- /dev/null
+++ b/backchannel-web/src/vite-env.d.ts
@@ -0,0 +1 @@
+/// <reference types="vite/client" />
diff --git a/backchannel-web/tsconfig.json b/backchannel-web/tsconfig.json
new file mode 100644
index 0000000..f68352b
--- /dev/null
+++ b/backchannel-web/tsconfig.json
@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    "moduleResolution": "Bundler",
+    "allowImportingTsExtensions": false,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src"]
+}
diff --git a/backchannel-web/tsconfig.tsbuildinfo b/backchannel-web/tsconfig.tsbuildinfo
new file mode 100644
index 0000000..a1f5158
--- /dev/null
+++ b/backchannel-web/tsconfig.tsbuildinfo
@@ -0,0 +1 @@
+{"root":["./src/app.tsx","./src/crypto.ts","./src/main.tsx","./src/protocol.ts","./src/vite-env.d.ts"],"version":"5.9.3"}
\ No newline at end of file
diff --git a/backchannel-web/vite.config.ts b/backchannel-web/vite.config.ts
new file mode 100644
index 0000000..081c8d9
--- /dev/null
+++ b/backchannel-web/vite.config.ts
@@ -0,0 +1,6 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+
+export default defineConfig({
+  plugins: [react()],
+});