Open-source dependencies · Enterprise applications
Signal
Signal protects both initial key agreement and continuing message sessions with hybrid post-quantum constructions.
ShippingVerified through 2026-09-06
Products
2 recordsVerified capability
Open-source dependencies
ShippingPQXDH / SPQR ratchet
- Initial key agreement
- Hybrid ML-KEM since 2023
- Ongoing ratchet
- Post-quantum ratchet rolled out 2025
CSignal engineering publicationsChecked 2026-09-06
Open first-party evidence Enterprise applications
ShippingSignal with PQXDH and SPQR
- Initial agreement
- Hybrid post-quantum PQXDH
- Ongoing sessions
- Sparse Post Quantum Ratchet
CSignal protocol engineering publicationsChecked 2026-09-06
Open first-party evidence Roadmap explorer
2 dated stepsPublished milestones
- 2023-09-19shippedC
PQXDH announced
Signal introduced hybrid post-quantum protection for initial asynchronous key agreement.
Quantum Resistance and the Signal Protocol - 2025shippedC
Sparse Post Quantum Ratchet rollout
Signal added continuing post-quantum healing to its messaging ratchet; the product record does not assign a universal client cut-over day.
Signal engineering publications