Tonight on GeekNights, we consider how multi-factor authentication works. We've previously talked about single Signon, biometrics, the levels of security & privacy, and the like, but we've never actually talked about how TOTP and other multi-factor authentication schemes work. In the news, the ship is no longer stuck, New York opens up vaccines to everybody, fake ai-generated and fake stolen-profile-photo twitter accounts are spreading Amazon's anti-union propaganda, and the Free Software Foundation has ruined its reputation by bringing Richard Stallman back on board, with many others joining the denouncement. Also note that there is a vulnerability in 2FA keys that allows cloning them.