Technology
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Passkeys are not passwords. When you authenticate using passkeys you will proof that you have the secret (passkey), but you will never reveal that secret to the service you are authentication against.
So even if someone is able to steal that package containing the answer, that answer will not be valid a second time.
I’m sorry, but this still sounds as much like “Mares eat oats” as it did when I first heard it a decade ago. You still enter a username and password somewhere (ideally in your password manager) to gain access to your account.
If you're entering a u/p along with a passkey, then it's MFA.
There are only a few sites I know of that do passkey correctly. CVS works wonderfully on my phone. Requires a username and then the passkey on my browser.
My company is working on a passkey only for login and it's really really slick.
You basically click "login" and then authenticate your passkey and you're in.
It's one of the very few things Microsoft actually gets right on their websites. You select to log in with a passkey, authenticate, optionally select which account you want to use, and you're signed in. Not a single username or password entered into the website.