Signal introduces the Sparse Post Quantum Ratchet (SPQR), a new cryptographic protocol that protects messaging against future quantum computing threats. The Triple Ratchet combines SPQR with Signal's existing Double Ratchet to maintain forward secrecy and post-compromise security while adding quantum resistance. The protocol
Table of contents
The Current State of the Signal ProtocolMixing In Quantum SecurityWho Wants What WhenSay (or Send) LessA Meditation On How Faster Isn’t Always BetterBut Let’s Still Be EfficientMixing Things Up - The Triple RatchetHeterogeneous RolloutMaking Sure We Get It RightFormal Verification From the StartFormal Verification Doesn’t Freeze Our ProgressTLDRSort: