The FIDO2 project

The FIDO2 project consists of the web authentication specification (WebAuthn) of W3C and the related CTAP protocol (client-to-authenticator protocol) with which users can use FIDO devices for easy authentication for online services. FIDO2 is to some extent an advanced development of the FIDO protocols U2F and UAF.

WebAuthn and CTAP

WebAuthn defines a standard web API, which can be integrated in browsers, and the related web platform infrastructure, to enable the use of FIDO authentication for online services. CTAP gives external devices like mobile phones or FIDO security keys the ability to work together with WebAuthn, and it serves as an authenticator for desktop applications and web services.

Several large web browsers have already implemented these standards, including Chrome, Firefox and Microsoft Edge. Android and Windows 10 also include integrated support for the FIDO authentication.