SoloKeys on Ubuntu Linux
I finally received the SoloKeys open source FIDO2 U2F security keys I ordered via their KickStarter last year.
They’re little USB devices that you stick into your computer to act as a physical second factor when authenticating to websites (or, potentially, other software). Instead of typing in a code received via SMS or from an authenticator application, you press a button on the device and it cryptographically identifies itself.
That’s the theory, anyway.