I used to GM (gamemaster) Paranoia every once in a while.
The poor, hapless clones (the other people role-playhing) always thought that if they phrase the question just the right way, they'll get the information they need to, er, survive to the end of the game.
One of my main jobs as GM was to invent, usually on the fly, all sorts of reasons why "that information is above your security clearance".
That Prenda Hearing dialogue sounded like half the games I ran... Good times.
Voice-activated? Fingerprint? Er...haven't these been fooled by work-arounds? Besides, by displaying the password, aren't you:
1) forcing the user to use easy-to-type-in passwords?
2) exposing yourself to "over-the-shoulder" cryptanalysis attacks?