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| Name | Modified | Size | Downloads / Week |
|---|---|---|---|
| Parent folder | |||
| README.md | 2026-07-23 | 2.3 kB | |
| v5.5.0 -- Encrypted voice _ video calls source code.tar.gz | 2026-07-23 | 29.6 MB | |
| v5.5.0 -- Encrypted voice _ video calls source code.zip | 2026-07-23 | 29.7 MB | |
| Totals: 3 Items | 59.3 MB | 0 | |
v5.5.0 — Encrypted voice & video calls
SecureBit now supports end-to-end encrypted voice and video calls — the "5.5 Secure Voice & Calls" roadmap milestone.
Added
- Voice & video calls. Start a call from the chat header (phone / camera buttons). Audio and video tracks ride the same RTCPeerConnection as the chat, bundled onto one DTLS-SRTP transport — so media is end-to-end encrypted with the very connection that in-person SAS verification authenticated. Call setup (SDP offer/answer) is renegotiated in-band over the verified data channel, never through a signalling server, so the media's DTLS fingerprints are authenticated end-to-end too. There is no server that can see or MITM a call.
- Verification-gated. Calls are only permitted once a session is connected and SAS-verified; the manager rejects call signalling otherwise. The header call buttons stay disabled until then.
- In-call controls. Mute / unmute, camera on/off (turning the camera on during a voice call upgrades it to video in-band), front/back camera flip, minimize-to-widget (chat stays usable) and hang up. Incoming calls show an accept / decline prompt.
- Adaptive audio codec. Opus tuned for real-world links — in-band FEC, DTX and RED redundancy (RED preferred first where the browser advertises it) keep speech intelligible under 15–20% packet loss. Audio is bandwidth-prioritised and is never throttled by the network controller.
- Adaptive video codec. VP9 / AV1 single-encoding SVC (with H.264 / VP8 fallback), so video degrades gracefully by spatial/temporal layer on a weak link. A runtime
NetworkAdaptationControllerreadsgetStats()every second and trims video bitrate on loss/RTT, recovering as the link clears — no renegotiation, no track restart. - Live connection-quality indicator. Excellent → Good → Fair → Weak, surfaced in the voice overlay, video top bar and minimized widget. Codec tunables and their rationale are documented in
docs/webrtc-config.md.
Security
- Media inherits the session's DTLS-SRTP encryption; SDP is exchanged only over the ECDH + SAS-authenticated data channel. No new ICE or signalling server is introduced — calls reuse the existing verified transport.
