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This is something being sold in favor of passkeys but I can't ser how "more secure" it is for me.
I use Bitwarden, the domain name matching works exactly like passkey's. How more secure a passkey is, if it has 0 changes to this domain name detection?
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
With a breach of the server then they can get your password the next time you log in and maintain persistent access until they're both kicked out and everybody has changed passwords.
With passkeys you don't need to do anything, they never had your secret.