X41 D-Sec: post-quantum cryptography audit services
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X41 D-Sec performs source-code audits of open-source software, including cryptographic libraries, often funded by open-source security programs, and publishes its reports.

Website: https://x41-dsec.de
Headquarters: Aachen, Germany
Focus: Source-code audits of open-source security and cryptographic software
Post-quantum services: Source-code audits of cryptographic libraries and protocol implementations | Public audit reports
Evidence: https://x41-dsec.de/security/research/

Source page: https://pqaudit.org/auditors/x41-d-sec/
Compiled by: PQC Audit Index editors (https://pqaudit.org/about/)
Last reviewed: 2026-09-12