FIDO2 Explained: WebAuthn, Passkeys, and Security

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FIDO2 is a set of standards for public-key authentication, consisting of the WebAuthn API and the Client to Authenticator Protocol (CTAP), which together enable secure, phishing-resistant user authentication without storing reusable shared secrets like passwords. It divides responsibilities across roles: the relying party, client, authenticator, and user, using cryptographic credentials where the private key remains with the authenticator while the public key is verified by the relying party. FIDO2 can be employed in various authentication scenarios, from passwordless sign-ins to multi-factor authentication, by supporting both device-bound and synchronized passkeys, enhancing its flexibility and security. It emphasizes the importance of strong credential lifecycle management and robust recovery processes to maintain security, particularly against phishing and replay attacks. While FIDO2 provides secure authentication by verifying control over a credential, it does not inherently establish a user's real-world identity, necessitating additional identity proofing measures for comprehensive security in scenarios that require legal identity verification.

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