this post was submitted on 09 Apr 2024
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It basically performs the same function as an SSH key (providing public key authentication), yes.
Your issue with logging in on your phone vs laptop can be solved by either syncing them (like the OS/Browser platforms of Google/Apple/Microsoft or a password manager like Proton Pass/Bitwarden do) or by setting up each device separately (like most people should do with SSH keys). Each method comes with trade-offs: syncing means they aren't device bound and can potentially be stolen, setting it up on each device can be a pain, etc.
The important thing to remember is that passkeys don't need to be the only authentication methods attached to an account. You can use the convenience of a passkey most of the time when it's possible and then fall back to another method (like a password/TOTP pair) when that's not available (such as when setting up a new device). There's also always the standard account recovery options if all else fails, those don't necessarily go away.
The other thing to remember is that it's not trying to be a perfectly secure solution to all authentication everywhere but to replace passwords with something better. Not having to generate and store random passwords with arbitrary complexity requirements, being able to log in with just a tap or a click, and not having anything that needs to be kept secret on the website's side can be enough of an improvement over passwords to make the change worthwhile.
If a passkey isn't device bound, what makes different/better than a complex password? Is it just the standardisation that you mention? Enforcing using passkeys becomes exactly the same as enforcing using complex passwords
One key benefit regarding hacking: the data that's passed back and forth between the user's browser/app and the website/service is a challenge and a response and is no longer sensitive like a password is and the authentication related data (the public key) that the website stores for a user's account isn't useful to an attacker.
One key benefit regarding phishing: passkeys/WebAuthn credentials incorporate the domain name into part of the authentication and it's enforced by the browser. This means that using a passkey/security key on the wrong site won't give an attacker anything useful unless they also somehow control the DNS and have a valid TLS certificate to impersonate the site with. This is unlike the situation with a phishing website where a user can be tricked by a fake but convincing looking website into giving over not just a password but a one time code provided through SMS or a TOTP.
One key benefit regarding usability: The user just has to choose which account to log into from their password manager instead of having it need to autofill correctly on the website (I still run into sites that don't autofill right). They also don't need to worry about any specific password complexity requirements or changing passwords in response to breaches or password expiration times.
this makes a lot of sense, thanks!