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Signal Protocol's Path to Quantum-Resistant Messaging

🔒 Signal has moved to integrate post-quantum cryptography into its messaging stack to mitigate future quantum threats. Phase 1 uses PQXDH, a hybrid handshake combining X25519 with the KEM CRYSTALS-Kyber, to block harvest now, decrypt later attacks. Phase 2 adds SPQR, which runs alongside the Double Ratchet to form a hybrid Triple Ratchet, preserving forward secrecy and post-compromise security while handling larger key sizes, asynchrony, and message loss.