What is U2F Authentication?

FIDO U2F is a standardised protocol designed to enable “relying parties to offer a strong cryptographic 2nd factor option for end user security”.

We dig into the topic of U2F Authentication in much more detail on our blog, here.

U2F No Longer Supported

Sometime around 2021, most popular modern web browsers started deprecating support for U2F Authentication. By 2023, support for the protocal has all but disappeared completely.

The intention is to make way for WebAuthn support. This is functionally similar to U2F (as far as the end user is concerned), but the underlying protocol has been updated.

Shield Security, as of v18.5 onwards, does offer support for WebAuthn devices and Passkeys.