this post was submitted on 13 Mar 2026
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Public key cryptography tied to physical hardware, so if you lose your phone / usb key, you need to use your backup recovery code; a fairly short one time password that negates the security benefits of Fido in one easy step.
It can also use biometrics, but that requires every device you log in on to have biometric readers.
Or you could use multiple fido key's as backups