Signal introduces Sparse Post-Quantum Ratchet (SPQR) for quantum-resistant encryption

First reported

03.10.2025 20:15

Last updated

1 unique sources, 1 articles

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Signal, a cross-platform end-to-end encrypted messaging app, has introduced Sparse Post-Quantum Ratchet (SPQR), a new cryptographic component designed to defend against quantum computing threats. SPQR ensures forward secrecy and post-compromise security by continuously updating encryption keys and discarding old ones. The new component utilizes post-quantum Key-Encapsulation Mechanisms (ML-KEM) and features efficient chunking and erasure coding to handle large key sizes without increasing bandwidth. SPQR will be gradually rolled out to all users and will be backward compatible. Once fully deployed, Signal will enforce SPQR across all sessions. The development was a collaborative effort with PQShield, AIST (Japan), and New York University, and the system has undergone formal verification and robust testing.

Timeline

03.10.2025 20:15 1 articles · 5h ago

Signal introduces Sparse Post-Quantum Ratchet (SPQR) for quantum-resistant encryption
Signal has introduced Sparse Post-Quantum Ratchet (SPQR), a new cryptographic component designed to defend against quantum computing threats. SPQR ensures forward secrecy and post-compromise security by continuously updating encryption keys and discarding old ones. The new component utilizes post-quantum Key-Encapsulation Mechanisms (ML-KEM) and efficient chunking and erasure coding to handle large key sizes without increasing bandwidth. The development was a collaborative effort with PQShield, AIST (Japan), and New York University, and the system has undergone formal verification and robust testing. SPQR will be gradually rolled out to all users and will be backward compatible.
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Signal adds new cryptographic defense against quantum attacks — www.bleepingcomputer.com — 03.10.2025 20:15
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Information Snippets

Signal has introduced Sparse Post-Quantum Ratchet (SPQR) to defend against quantum computing threats.
First reported: 03.10.2025 20:15

1 source, 1 article
Show sources
- Signal adds new cryptographic defense against quantum attacks — www.bleepingcomputer.com — 03.10.2025 20:15
SPQR ensures forward secrecy and post-compromise security by continuously updating encryption keys.
First reported: 03.10.2025 20:15

1 source, 1 article
Show sources
- Signal adds new cryptographic defense against quantum attacks — www.bleepingcomputer.com — 03.10.2025 20:15
SPQR utilizes post-quantum Key-Encapsulation Mechanisms (ML-KEM) and efficient chunking and erasure coding.
First reported: 03.10.2025 20:15

1 source, 1 article
Show sources
- Signal adds new cryptographic defense against quantum attacks — www.bleepingcomputer.com — 03.10.2025 20:15
SPQR will be gradually rolled out to all users and will be backward compatible.
First reported: 03.10.2025 20:15

1 source, 1 article
Show sources
- Signal adds new cryptographic defense against quantum attacks — www.bleepingcomputer.com — 03.10.2025 20:15
The development of SPQR was a collaborative effort with PQShield, AIST (Japan), and New York University.
First reported: 03.10.2025 20:15

1 source, 1 article
Show sources
- Signal adds new cryptographic defense against quantum attacks — www.bleepingcomputer.com — 03.10.2025 20:15
The system has undergone formal verification and robust testing.
First reported: 03.10.2025 20:15

1 source, 1 article
Show sources
- Signal adds new cryptographic defense against quantum attacks — www.bleepingcomputer.com — 03.10.2025 20:15