1-to-1 chat (technical)
Private two-party messaging is Buzzio’s flagship sealed surface.
Privacy properties
| Property | Status |
|---|---|
| Content E2EE | Yes — X3DH + Double Ratchet + AES-GCM |
| Delete-on-delivery relay | Yes |
| Undelivered purge | ~3 days |
| Local history | SQLCipher on device |
| Sealed-sender preferred path | Yes — write cutover complete (legacy write fallback off) |
| Operator-readable transcript | No |
In-chat privacy tools
Use Glossary names — do not mix these up.
| Tool | Behavior |
|---|---|
| Secure View | Mutual screenshot/recording hardening; pending requests ~2h |
| Vanish | Short TTL after seen (seconds–hours); countdown from recipient view |
| Disappearing messages | Chat-level 24h / 7d / 90d |
| Once-view messages | ~5s after seen + stronger screenshot protection |
| View-once media | Open once, then leave the thread experience |
| Kept messages | Exempt selected messages from disappearing timers |
These tools are orthogonal to E2EE: they reduce residual device exposure after decrypt. Prefer sealed control delivery so enabling them does not recreate plaintext A↔B signal trees.
Delivery
Calls
Voice and video on this surface: Encrypted calls.