> Or just a one-time pad QR code that the person loads onto whatever
> available device has a screen: digital camera, telephone, mp3 players, the
> Raisonance Primer that is in my locker, etc... This one-time code would be
> generated over the internet before said hacker would like to enter the
> space. In order to give Romain et al the ability to not be a little late,
> the code could be good for up to 6 hours.
> That would be about as secure as the wifi, password-remembering telephones
> currently being used, so I don't see any immediate additional security