The Client to Authenticator Protocol (CTAP) or X.1278 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.
CTAP is complementary to the Web Authentication (WebAuthn) standard published by the World Wide Web Consortium (W3C). WebAuthn and CTAP are the primary outputs of the FIDO2 Project, a joint effort between the FIDO Alliance and the W3C.
CTAP is based upon previous work done by the FIDO Alliance, in particular the Universal 2nd Factor (U2F) authentication standard. Specifically, the FIDO U2F 1.2 Proposed Standard (July 11, 2017) became the starting point for the CTAP Proposed Standard, the latest version of which was published on January 30, 2019.
The CTAP specification refers to two protocol versions, the CTAP1/U2F protocol and the CTAP2 protocol. An authenticator that implements CTAP2 is called a FIDO2 authenticator (also called a WebAuthn authenticator). If that authenticator implements CTAP1/U2F as well, it is backward compatible with U2F.
The protocol uses the CBOR binary data serialization format.
- "X.1278: Client to authenticator protocol/Universal 2-factor framework". www.itu.int. Archived from the original on 2021-06-28. Retrieved 2021-06-28.
- Balfanz, Dirk; Czeskis, Alexei; Hodges, Jeff; Jones, J.C.; Jones, Michael B.; Kumar, Akshay; Liao, Angelo; Lindemann, Rolf; Lundberg, Emil, eds. (4 March 2019). "Web Authentication: An API for accessing Public Key Credentials Level 1". World Wide Web Consortium (W3C). Retrieved 4 March 2019.
- "FIDO2: Moving the World Beyond Passwords". FIDO Alliance. Retrieved 30 January 2019.
- Brand, Christiaan; Czeskis, Alexei; Ehrensvärd, Jakob; Jones, Michael B.; Kumar, Akshay; Lindemann, Rolf; Powers, Adam; Verrept, Johan, eds. (January 30, 2019). "Client to Authenticator Protocol (CTAP)". FIDO Alliance. Archived from the original on 17 March 2022. Retrieved 7 March 2019.
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