How Passkeys Work?

Passkeys make logging in easier and safer by using cryptographic keys instead of passwords. Here’s how it all works:

When you add a passkey to your account, your device creates a unique cryptographic key pair — a private key and a public key. The private key stays securely on your device, while the public key is sent to the authentication server and stored with your account.

Later, when you want to log in, the server sends a cryptographic challenge to your device. Your device uses the private key to sign this challenge and sends the signed response back. The server uses the stored public key to verify that the response is valid. If it’s valid, you’re logged in!

Because the private key never leaves your device, no one else can log in as you — even if the server is breached.