Autocrypt v2: Post-Quantum Encryption and Reliable Deletion for Email/Messaging
Summary
Autocrypt v2 introduces post-quantum resistant encryption and reliable deletion for messaging, expanding from email-focused to universal cryptographic identity with a standard OpenPGP v6 certificate. It uses a hybrid ML-KEM-768 + X25519 scheme, provides automatic key expiration and destruction, and features a zero coordination, offline-friendly key ratcheting mechanism with a fixed 2938-byte certificate. The article includes specs, implementation timelines, and notes on coordinated deletion across devices.