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’m really over people calling backups a security risk.
There’s a reason bitwarden, 1password, last pass, etc etc. allow you to export your passwords. They also all allow you to do so in an encrypted file.
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The method you describe is untenable for 99.9% of the population. If that is truly the only way to migrate, then this move to passkeys is a catastrophe for security. In the coming years, millions of people are going to be permanently locked out of important accounts. Accounts will be written about the clearly flawed implementation of passkeys by Apple and Google, and a whole generation of people are going to shun passkeys forever. Myself included. This is a nightmare for vendor lock-in. I can see why Apple and Google are so ready to implement this.