this post was submitted on 22 Dec 2025
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A passkey is a key pair where you keep the private key and give the public one to the service. Then you can log in by proving you have the private key. Fairly simple in theory. Horribly complex in practice.
Doesn't a normal modern password, hashed, essentielly do the same thing?
No sane service has your actual password.
Yes, kind of. You’re still giving them your password every time you log in. And it’s on them whether they store it hashed or in plain text. With a passkey, you know that even if they’re hacked, they’ll never get your actual private key.
But, if they’re hacked, your key is probably the least of your concerns.