Cloudflare now supports security keys as a two factor authentication (2FA) method for all users on WebAuthn-supported browsers. This feature enhances account security by using public key cryptography and hardware security keys or built-in biometric support. WebAuthn is more resistant to phishing attacks, credential-based attacks, and offers better privacy guarantees compared to other 2FA methods. It also simplifies the user experience by eliminating the need for mobile app-based authentication.