Get the latest tech news
OpenSSH Post-Quantum Cryptography
OpenSSH post quantum cryptography
If you are unable to update the server and/or you prefer to accept the risk of continuing to use quantum-unsafe cryptography then the warning may be silenced via the WarnWeakCrypto option in ssh_config(5). This is a waste of time Some people consider the task of scaling existing quantum computers up to the point where they can tackle cryptographic problems to be practically insurmountable. To defend against this happening we have selected post-quantum algorithms with good safety margins, this means that even if they turn out to be weaker than expected they are still likely to be strong enough to be considered fit for purpose.
Or read this on Hacker News