That’s the part where the server doesn’t story any information that an attacker could use to log in. The attacker would need the private key, which is stored inside a secure chip on your device (unless you decide to store it in your password manager). All that’s stored server side, is the public key.

When you’re using a password, the server will store a hashed version of that password. If this is leaked, an attacker can attempt to brute-force this leaked password. If the server didn’t properly store hash the password, a leak simply exposes the password and allows the attacker access. If the user didn’t generate unique passwords for each site/server, that exposes them further to password spraying. In that case an attacker would try these same credentials on multiple sites, potentially giving them access to all these accounts.

In case of passkey, the public key doesn’t need to be secret. The secret part is all on your end (unless you store that secret in the managed vault of your password manager).

I do agree that your risk is quite small if you’re already

• using a decent password manager
• doing that the right way
• have enabled 2FA wherever possible

The biggest difference: nothing sensitive is stored on the server. No passwords, no password hashes, just a public key. No amount of brute forcing, dictionary attacks or rainbow tables can help an attacker log in with a public key.

“But what about phising? If the attacker has the public key, they can pretend to be the actual site and trick the user into logging in.” Only if they also manage to use the same domain name. Like a password manager, passkeys are stored for a specific domain name. If the domain doesn’t match, the passkey won’t be found.

https://www.youtube.com/watch?v=qNy_Q9fth-4 gives a pretty good introduction on them.

I recently saw this video about the British Library. They collect everything that’s published in the UK (books, magazines, papers, leaflets, flyers, …). One of the librarians makes a pretty good case about the use of collecting and preserving everything. Even (or especially) the things you don’t think are worth preserving.