Fantastic. I have been thinking that the best possible thing would be an external device with a screen and a key pad input. This seems to be exactly that.
You need the screen because the protocol includes the concept of an authenticator with a screen, and that allows you to verify the information even more compared to a yubikey or something like that.
You need the screen because the protocol includes the concept of an authenticator with a screen, and that allows you to verify the information even more compared to a yubikey or something like that.