Quarkslab: post-quantum cryptography audit services
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Quarkslab is a French security research firm whose cryptography team has published implementation bug-hunting work on HQC and analysis of Signal's post-quantum Triple Ratchet, and performs cryptographic audits for vendors and open-source projects.

Website: https://www.quarkslab.com
Headquarters: Paris, France
Focus: Reverse engineering, cryptography, and secure implementation research
Post-quantum services: Cryptographic implementation audits, including post-quantum KEMs and signatures | Automated conformance testing of post-quantum implementations
Evidence: https://blog.quarkslab.com/finding-bugs-in-implementations-of-hqc-the-fifth-post-quantum-standard.html | https://blog.quarkslab.com/triple-threat-signals-ratchet-goes-post-quantum.html

Source page: https://pqaudit.org/auditors/quarkslab/
Compiled by: PQC Audit Index editors (https://pqaudit.org/about/)
Last reviewed: 2026-09-12