Passkey is some sort of specific unique key to a device allowing to use a pin on a device instead of the password. But which won’t work on another device.
Now I don’t know if that key can be stolen or not, or if it’s really more secure or not, as people have really unsecure pins.
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I have MFA in addition to that pw, yes
That’s news to me. Which other mobile authentication is there besides pin, pattern, facial and fingerprint?
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My 6 character alphanumeric pin is more secure than your four digit numeric
Even FIDO2 MFA doesn’t protect you from attacks that involve malware running on your machine. If there was a keylogger on their machine then that machine is likely compromised in other ways, and any credentials entered or stored on it should be considered compromised and should be reset.