2026-06-13 dotnet-11csharpcryptography X25519 Key Agreement Lands In-Box in .NET 11 Preview 5 .NET 11 Preview 5 adds a first-class X25519DiffieHellman type to System.Security.Cryptography, so you can do Curve25519 key exchange without BouncyCastle or NSec.
2026-05-13 errorscsharpdotnet Fix: System.Security.Cryptography.CryptographicException: Keyset does not exist The certificate's private key lives in a separate Windows key file the current process identity cannot read. Grant ACL on the key, load the PFX with MachineKeySet, or use EphemeralKeySet.
2026-02-08 dotnet-10cryptographysecurity .NET 10 Post-Quantum Cryptography: ML-KEM, ML-DSA, and SLH-DSA .NET 10 adds native support for post-quantum cryptography algorithms ML-KEM, ML-DSA, and SLH-DSA, preparing your applications for a quantum-resistant future.