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Reference.org
Client to Authenticator Protocol
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<p>The Client to Authenticator Protocol (CTAP) or X.1278 enables a roaming, user-controlled <a href="/facts/Cryptography/e94PEVau">cryptographic</a> <a href="/facts/Authenticator/LouBFCYj">authenticator</a> (such as a <a href="/facts/Smartphone/cSIrBMWG">smartphone</a> or a hardware <a href="/facts/Security_token/0V55fErB">security key</a>) to interoperate with a <a href="/facts/Client_(computing)/u0wlVsWI">client</a> platform such as a <a href="/facts/Laptop/3EFwTAb2">laptop</a>. </p>