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Passkey is "something you own" right?
I have something I own, it's a Yubikey
And how many sites support Yubikeys/Security Keys? Not many. I doubt we'll see more either now with Passkeys becoming more prominent.
I have two Yubikeys and other than securing my password manager vault they are rarely used elsewhere.
I thought passkeys had to be behind biometrics, so “own” + “are”?
I don't think that's true.
You can store them in keepassxc which can be accessed with a password.
I think it's "have" + "know" or "are".
So you have the device with the passkey, and know the unlock pin or are the person with the biometrics.
How i interpretted it is that the biometrics provide access to the tpm which is like a built in yubikey you "own".