mqtt: add v3 double-ratchet sessions and invariants contract#20
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doomhammerhell
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Apr 15, 2026
doomhammerhell
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- Replace symmetric-only session chains with a DH-driven double ratchet (PCS) and strict topic/context binding
- Enforce hard size limits, wire ID sanitation, and per-peer/global token-bucket budgets before expensive crypto
- Add SECURITY_INVARIANTS.md and regression tests for rollback/policy/session invariants
- Fix ratchet message-limit handling; remove unsafe auto-rotation path
- Update MQTT and security documentation
- Replace symmetric-only session chains with a DH-driven double ratchet (PCS) and strict topic/context binding - Enforce hard size limits, wire ID sanitation, and per-peer/global token-bucket budgets before expensive crypto - Add SECURITY_INVARIANTS.md and regression tests for rollback/policy/session invariants - Fix ratchet message-limit handling; remove unsafe auto-rotation path - Update MQTT and security documentation
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