The Yubikey

The document discusses authentication and identity theft. It describes OpenID as a centralized identity management system but notes it does not prevent identity theft. The document then introduces the YubiKey, a small hardware device that generates a unique user ID and one-time password for multi-factor authentication. The YubiKey works by encrypting authentication information using an AES key and generates a new code each time the button is pressed, making it resistant to replay attacks. The document recommends the YubiKey for securely authenticating users.