xerostyle/covcom
Covert communications for private group conversations. https://github.com/xero/covcom
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xerostyle/covcom repository overview
COVCOM
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Covert communications for private group conversations.
Invite, talk, close the client, and the chat vanishes.
Every message is encrypted with XChaCha20 and signed
with Ed25519. A BLAKE3 fingerprint on each key allows
peers to verify one another. SPQR's manual and epoch
ratchets add forward secrecy, while post-quantum
ML-KEM-768 encapsulation keeps recorded communications
unreadable and secure against future cryptanalysis.
CLI & Web Client Previews
https://xero.github.io/covcom/
Crypto stack: XChaCha20-Poly1305 AEAD, ML-KEM-768 post-quantum KEM ratchet, HKDF-SHA-256 chain derivation, Ed25519 message + identity-claim signatures, and a BLAKE3-chained identity fingerprint for out-of-band verification.
Version Support
COVCOM follows a rolling support policy. When a security fix ships, the previous version is deprecated immediately. Only the current release is supported. Deprecated versions receive no patches, so upgrade promptly.
COVCOM releases in tandem with its cryptographic library leviathan-crypto. A vulnerability in either project triggers a coordinated release of both.
Beyond Docker, the same versions ship as GitHub release binaries and as npm packages (covcom and covcom-server), all cut from the same release and deprecated in lockstep.
| Tag | Status | Reason |
|---|---|---|
| 3.1.0 | ✓ supported | Latest version |
| 3.0.0 | ✗ deprecated | insufficient rendering sanitization |
| 1.0.0 | ✗ deprecated | XChaCha20 seal wasn't key-committing, thus vulnerable to salamander style partitioning-oracle attacks |
| 0.0.1 | ✗ deprecated | public beta |
Quick Start
Point chat.example.com at the host you'll run on, then:
docker pull xerostyle/covcom:latest
docker run -d \
-p 80:80 -p 443:443 \
-e DOMAIN=chat.example.com \
-v covcom_caddy_data:/data \
-v covcom_caddy_config:/config \
xerostyle/covcom:latest
Caddy auto-provisions a TLS certificate for $DOMAIN on first start and stores
it on the covcom_caddy_data volume, so it survives restarts and avoids
Let's Encrypt rate limits.
Open https://chat.example.com in a browser. Create a room, share the invite, & chat.
Environment Variables
| Variable | Default | Description |
|---|---|---|
DOMAIN | required | Domain name for Caddy TLS |
PORT | 1337 | Internal port the Bun server listens on |
ADMIN_TOKEN | unset | Optional token gating room creation |
ROOM_TTL | 24 | Hours before empty rooms expire (0 disables) |
MAX_ROOM_SIZE | 20 | Max participants per room (0 is unlimited) |
Documentation
| Document | Purpose |
|---|---|
| USAGE | Client and server applications development and runtime help |
| PROTOCOL | Cipher, chains, ratchet, group model, session lifecycle, server role |
| CRYPTOGRAPHY | Primitives, KDF chains, wire format, invite encoding |
| THREAT-MODEL | Principals, adversary tiers, guarantees, non-goals |
| CLI-SPEC | CLI architecture, rendering, input, widgets, views, & color system |
| SECURITY-POLICY | Supported versions, disclosure policy, cryptographic foundation |
| DIAGRAM | Animated visualization of a session: establishment, epochs, and reconnect ceremonies |
License
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COVCOM is released under the MIT license
Tag summary
Content type
Image
Digest
sha256:4b511748a…
Size
325.5 MB
Last updated
3 months ago
docker pull xerostyle/covcom