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Client to Authenticator Protocol (CTAP)

Standard interoperation between a user platform (e.g. a laptop) and a user-controlled cryptographic authenticator.

  • ITU-T Recommendation X.1278.

Based in the Universal 2nd Factor (U2F) authentication standard.

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Variants

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CTAP1/U2F

FIDO U2F.

Raw message format

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CTAP2

For FIDO2 authenticators (aka WebAuthn authenticators).

CBOR (Concise Binary Object Representation) data serialization format.

  • Loosely based on JSON but in a binary format.

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