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Signal launches Triple Ratchet: quantum protection against future hacks. The Signal Protocol, the backbone of end-to-end encryption for billions of private messages worldwide, has received a groundbreaking upgrade. With the introduction of the Sparse Post Quantum Ratchet (SPQR), the Signal developers are building upon a Triple Ratchet protocol. This addition makes communication via the protocol resistant to future threats from powerful quantum computers, while preserving the fundamental security principles of Forward Secrecy (FS) and Post-Compromise Security (PCS). FS protects past messages from future breaches, while PCS protects future messages from a compromise in the present or past. This 'resilience' is crucial for the security of long-term chat sessions. Closing the future security gap. Earlier this year, Signal already introduced PQXDH, a first step towards quantum resistance that ensured new chat sessions use quantum-safe cryptographic keys. This protects against so-called 'harvest-now-decrypt-later' attacks, where encrypted data is stored now in the hope of decrypting it later with a quantum computer. However, the new SPQR ratchet addresses security during an ongoing session. The original Signal Protocol used Elliptic Curve Diffie-Hellman (ECDH) for continuously generating new, irreversible keys (the 'ratcheting'). Although ECDH is currently secure, it is not quantum-resistant. If a malicious actor (such as 'Mallory') in the future were to possess a powerful quantum computer, she could derive the ECDH secrets from recorded communication, meaning a session would never 'recover' from a compromise after a breach. The SPQR ratchet replaces the ECDH method with a quantum-safe method based on a Key-Encapsulation Mechanism (KEM), specifically ML-KEM 768. The birth of the 'Triple Ratchet' Instead of replacing the existing, proven Double Ratchet, Signal chose to run SPQR alongside it. This results in the Triple Ratchet protocol, where the keys from both ratchets are mixed through a Key Derivation Function (KDF). 'An attacker must now break both our elliptic curve and ML-KEM to even distinguish this key from random bits. This gives us hybrid security,' according to Graeme Connell and Rolfe Schmidt from Signal. For the average Signal user, the rollout of this new protocol means no change in the app experience. Through a smart, gradual rollout, all conversations will automatically and in the background migrate to the new, quantum-resistant protocol. Efficiency and formal verification. The implementation of the quantum-safe ML-KEM in a ratcheting protocol presented the developers with significant technical challenges. The quantum-safe keys are significantly larger at over 1000 bytes than the 32 bytes of ECDH, which has a major impact on bandwidth. To address this, Signal developed the ML-KEM Braid protocol. This uses erasure codes to split large key blocks into small, redundant 'chunks'. This allows the data to be sent efficiently and in parallel, even if messages are lost, without undermining security. Additionally, the mechanisms were designed so that generating new secrets does not happen too quickly, to prevent too many future 'epoch' secrets from becoming vulnerable simultaneously in a one-time breach. Given the complexity of the new mechanisms, Signal integrated formal verification of the protocol with partners such as PQShield, AIST, NYU, and Cryspen. This process, where protocol models are verified with software like ProVerif and F*, ensures that the new architecture provides the required quantum-safe and classical security guarantees before the code is rolled out. With this step, Signal reinforces its position as a leader in the field of cryptographic security, proactively prepared for the quantum era.

New design sets a high standard for post-quantum readiness.