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Training Camp • Cybersecurity Glossary
Universal 2nd Factor U2F is a FIDO hardware security key standard using public-key crypto for phishing-resistant two-factor authentication.
Universal 2nd Factor U2F Definition: Universal 2nd Factor U2F is a FIDO hardware security key standard using public-key crypto for phishing-resistant two-factor authentication.
Universal 2nd Factor U2F is an open authentication standard developed by the FIDO Alliance that strengthens two-factor authentication using hardware security keys that communicate over USB, NFC, or Bluetooth. U2F uses public-key cryptography and binds each credential to the website's origin, providing strong protection against phishing and man-in-the-middle attacks because credentials cannot be replayed against a fraudulent site. U2F was later incorporated into and superseded by the FIDO2 and WebAuthn standards, where it persists as the CTAP1 protocol.
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