Comment NOT a new idea (Score 1) 157
This trick was revealed back in the 1980's in a Commodore 64 game I had (I forget the name). The player is a spy who breaks into a top secret installation and at one point he comes to a door with a keypad. You have to think to use your thermal imaging device to look at the keys and guess the code based on how much each one is glowing. It's not a new idea at all. Of course, thermal cameras have always been very expensive, and remain so even today.