[rmc]

Better, but scrounging up a few million pounds for dongles, plus the non-stop cost and effort of replacing lost and stolen dongles, is not easy for a university, no matter how famous.

Additionally, what OSes will these dongles support? Would you rather "Oxford University bans Windows XP"? or "Oxford University bans iPhones"? etc.

[thomaslangston]

Dongles is probably a misnomer here. While dongle probably means something you plug in to authenticate, many two factor auth 'dongles' don't plug in at all. They have a LCD screen that shows a one time use token (6+ digit number) that you enter at the same time as your password.

[Evbn]

USB HID spec is cross platform.