Universal 2nd Factor (U2F) is an open authentication standard originally developed by Yubico and Google and now hosted by the FIDO Alliance. Security devices with U2F support allow you to use two-factor authentication more easily since they contain a secret key that provides a second factor only by pressing the device’s button. You don’t need to manage more credentials.
We already compared the YubiKey 4C and Nitrokey Pro that offer more features than only U2F. In this article, we compare the Yubico Security Key and Nitrokey FIDO U2F. Both tokens offer similar features and come with support for U2F.