What is FIDO2?
FIDO2 is a family of public-key authentication standards for web sign-in, including WebAuthn and authenticator communication.
Authentication components
A device or security key creates a site-specific key pair. The private key stays with the authenticator; the user approves the action and the server verifies a signature.
Uses and limitations
It reduces phishing risk, but account recovery still needs careful design. Biometrics typically unlock the local authenticator rather than being stored by the site.
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