Client to Authenticator Protocol

"CTAP" redirects here. For the diagnostic radiology study, see Computed tomography of the abdomen and pelvis. For the peptide, see CTAP (peptide).

The Client to Authenticator Protocol (CTAP) enables a roaming, user-controlled cryptographic authenticator (such as a smartphone or a hardware security key) to interoperate with a client platform such as a laptop. The standard is also adopted as ITU-T Recommendation X.1278.

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