Universal 2nd Factor (U2F) is an open standard that strengthens and simplifies two-factor authentication (2FA) using specialized Universal Serial Bus (USB) or near-field communication (NFC) devices based on similar security technology found in smart cards.[1][2][3][4][5] It is succeeded by the FIDO2 Project, which includes the W3C Web Authentication (WebAuthn) standard and the FIDO Alliance's Client to Authenticator Protocol 2 (CTAP2).[6]
While initially developed by Google and Yubico, with contribution from NXP Semiconductors, the standard is now hosted by the FIDO Alliance.[7][8]
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^Octopus, Cipher. "An In-Depth Guide to FIDO Protocols: U2F, UAF, and WebAuthn (FIDO2)". blog.strongkey.com. Retrieved 9 March 2021.
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