The U2F web API continues to work for U2F authenticators, but is limited to the Chrome and Opera browsers.

Mozilla Firefox 60 recently added support for WebAuthn, Chrome 67 will be shipping with WebAuthn support in the near future, and Microsoft has already announced they will support WebAuthn in Edge browsers.

So, what can organizations do if they are aiming to provide support for FIDO2? We recommend making support for WebAuthn as it works with existing FIDO U2F authenticators and also FIDO 2 authenticators. WebAuthn and CTAP2 are both required to deliver the FIDO2 passwordless login experience, but WebAuthn still supports FIDO U2F authenticators, since CTAP1 is also part of the WebAuthn specification. The FIDO U2F client-side protocol has been renamed CTAP1, and a new, extensible client-to-authenticator protocol (CTAP2) has been developed to allow for external authenticators (tokens, phones, smart cards etc.) to interface with FIDO2-enabled browsers and Operating Systems The U2F model is still the basis for FIDO2 and compatibility for existing U2F deployments is provided in the FIDO2 specs.Ī new, extensible web authentication API, called Webauthn, has been developed within W3C, which supports both existing FIDO U2F and upcoming FIDO2 credentials. The overall objective for FIDO2 is to provide an extended set of functionality to cover additional use-cases, with the main driver being passwordless login flows. It’s built on Yubico’s invention of a scalable public-key model in which a new key pair is generated for each service and an unlimited number of services can be supported, all while maintaining full separation between them to preserve privacy.Įssentially, FIDO2 is the passwordless evolution of FIDO U2F. The protocol is designed to act as a second factor to strengthen existing username/password-based login flows. U2F was developed by Yubico and Google, and contributed to the FIDO Alliance after it was successfully deployed for Google employees. What is the difference between FIDO U2F and FIDO2?

This blog will bring some clarity to those questions. Since then, Yubico has received questions on how these efforts are related, what role FIDO U2F and Yubico have in the mix, and what organizations can implement now - and in the future - to enable simple, strong authentication for employees and end-users. Last month, open authentication standards reached an important milestone Microsoft launched support for FIDO2 and CTAP, and the World Wide Web Consortium (W3C) won approval for WebAuthn.

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