With all the useful - and sometimes conflicting - advice floating around about how to create the a password that is unbreakable but still memorable, this looks like a refreshing change.

All you have to do is hold your phone near your face (or turn your webcam on if you're using a laptop) and it's goodbye to tedious passwords, and hello to checkout selfies.

This looks like as much of a game-changer as replacing tedious captcha images with a checkbox and a honeypot was.