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.
How does this work with checking my emails on a public computer in a library, for example? Somehow my private key needs to be shared with the library pc?
Wouldn’t the private key stay in your phone and you’d be exchanging a challenge and a response?