this post was submitted on 09 Apr 2024
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It depends on the passkey type (resident vs non-resident keys)
Right, now I remember reading about that, I forgot.
Passkey = Resident Key
Nonresident keys are not passkeys, they are solely a second form of authentication meaning the service you are logging into still requires a password.
Couldn't a site theoretically use a nonresident key with just a username, in place of a password?
This seems to imply it might be possible:
https://developers.yubico.com/WebAuthn/WebAuthn_Developer_Guide/Resident_Keys.html
For sure, but that still isn't a passkey. The method you are talking about is the equivalent of non-passphrase protected SSH protocol, which is a single form of authentication (i.e. if someone has your security key they have your account).
The term passkey implies MFA: having a physical key and a password, a physical key and a fingerprint scan, or equivalent.
Sure the username could be considered the password, but usernames are not designed to be protected the same way. For example, they typically are stored in clear text in a services database, so one databreach and it's over.