FIDO2 Protocol

A FIDO2 Protocol is an open industry-standard authentication protocol that enables passwordless authentication through public-key cryptography by the FIDO Alliance.

• AKA: Fast Identity Online 2 Protocol, FIDO2 Authentication Standard, WebAuthn/CTAP Protocol Suite.
• Context:
  • It can typically provide FIDO2 Phishing Resistance through FIDO2 origin binding.
  • It can typically enable FIDO2 User Verification through FIDO2 authenticator attestation.
  • It can typically support FIDO2 Cross-Platform Compatibility through FIDO2 standard interfaces.
  • It can typically implement FIDO2 Privacy Protection through FIDO2 unlinkable credentials.
  • It can typically facilitate FIDO2 Account Recovery through FIDO2 backup authenticators.
  • ...
  • It can often integrate FIDO2 Biometric Authentication through FIDO2 biometric sensors.
  • It can often provide FIDO2 Resident Credentials through FIDO2 discoverable credentials.
  • It can often enable FIDO2 Extension Mechanisms through FIDO2 extension protocols.
  • It can often support FIDO2 Transaction Confirmation through FIDO2 transaction authorization.
  • ...
  • It can range from being a Simple FIDO2 Protocol to being a Complex FIDO2 Protocol, depending on its FIDO2 implementation complexity.
  • It can range from being a Platform FIDO2 Protocol to being a Roaming FIDO2 Protocol, depending on its FIDO2 authenticator type.
  • It can range from being a Consumer FIDO2 Protocol to being an Enterprise FIDO2 Protocol, depending on its FIDO2 deployment scale.
  • It can range from being a Basic FIDO2 Protocol to being an Advanced FIDO2 Protocol, depending on its FIDO2 feature sophistication.
  • ...
  • It can integrate with Web Browser for FIDO2 web authentication.
  • It can connect to Operating System for FIDO2 platform authentication.
  • It can interface with Identity Provider for FIDO2 identity federation.
  • It can communicate with Relying Party Server for FIDO2 credential verification.
  • It can synchronize with Authenticator Device for FIDO2 key management.
  • ...
• Example(s):
  • WebAuthn Protocol Components, such as:
    • WebAuthn JavaScript API for FIDO2 browser integration.
    • WebAuthn Attestation Format for FIDO2 authenticator verification.
    • WebAuthn Extensions for FIDO2 enhanced functionality.
  • CTAP Protocol Components, such as:
    • CTAP2 Protocol for FIDO2 external authenticator communication.
    • CTAP1/U2F Protocol for FIDO2 backward compatibility.
    • CTAP Transport Protocols for FIDO2 device connection.
  • FIDO2 Implementations, such as:
    • Windows Hello FIDO2 for Microsoft platform authentication.
    • Android FIDO2 API for Android device authentication.
    • Apple Platform Authenticator for iOS/macOS authentication.
  • ...
• Counter-Example(s):
  • OAuth Protocol, which handles authorization delegation rather than authentication verification.
  • SAML Protocol, which uses XML assertions rather than cryptographic challenge-response.
  • Traditional Password Protocol, which transmits shared secrets rather than cryptographic proofs.
  • SMS OTP Protocol, which relies on telephone networks rather than cryptographic verification.
• See: Passkey, WebAuthn Standard, CTAP Protocol, Public Key Cryptography, Authentication Protocol, Secure Shell Protocol, OAuth Access Delegation Standard, Security Protocol, Encryption Key.

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