this post was submitted on 26 Sep 2024
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I'm surprised they'd expire the SSH keys rather than just requiring the password for the key to be rotated. I guess it's not too bad if the key itself is automatically rotated.
It would be more secure to have SSH keys that are stored on Yubikeys, though. Get the Yubikeys that check fingerprints (Yubikey Bio) if you're extra paranoid.
Problem they had was that ssh doesn't really have any way to enforce details of how the client key manifests and behaves. They could ship out the authentication devices after the security team trusted the public key, but that was more than they would have been willing to deal with.
Rotating the passphrase in the key wouldn't do any good anyway. If an attacker got a hold of your encrypted key to start guessing the passphrase, that instance of the key will never know that another copy has a passphrase change.