OpenSSH has implemented post-quantum key agreement algorithms to protect SSH connections against potential attacks from future quantum computers. Since version 9.0, it has defaulted to these algorithms and will issue warnings for non-post-quantum connections starting with version 10.1. Users are encouraged to update their servers to utilize these stronger cryptographic methods to prevent vulnerabilities associated with "store now, decrypt later" attacks.
openssh ✓
quantum-computing ✓
+ cryptography
security ✓
key-agreement ✓