---
id: 4335
title: "Triple Threat: Signal's Ratchet Goes Post-Quantum"
source_domain: blog.quarkslab.com
source_url: "https://blog.quarkslab.com/triple-threat-signals-ratchet-goes-post-quantum.html"
published_at: "2025-10-06 22:00"
tags: ["cryptography", "post-quantum", "ml-kem", "signal", "secure-messaging", "spqr"]
phying_url: "https://phying.com/item/4335"
lang: en
---

# Triple Threat: Signal's Ratchet Goes Post-Quantum

## Summary

Quarkslab examines Signal's new Sparse Post Quantum Ratchet (SPQR): how it piggybacks on ML-KEM to add post-quantum security to message-key derivation alongside the existing double ratchet.

## Intelligence Metadata

- **Sources:** blog.quarkslab.com
- **Published:** 2025-10-06 22:00
- **Original:** https://blog.quarkslab.com/triple-threat-signals-ratchet-goes-post-quantum.html
- **Phying News:** https://phying.com/item/4335