.NET 10 has been working on adding support for Post Quantum Cryptography, including X.509 certificates for HTTPS.

This issue is to track the enablement and support of three new X.509 certificate types:

1. ML-DSA
2. SLH-DSA
3. Hybrid-ML-DSA

The first two are expected to be in .NET 10 Preview 5, with some pieces of 2 already in .NET 10 preview 4. The third is yet to be implemented, as of writing.

Note that PQC support is currently very limited to certain operating systems. OpenSSL 3.5+ is required for Linux, and a Windows Insider build that contains support should be available in the near future.