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How many times a day do you encounter something that needs a PIN fed into it? You punch it into a ten-key pad, on which the figures are permanently assigned to each key--on a Diebold ATM, the 6 is always going to be in the same place and it's going to be in the same place on every Diebold ATM. The risk is that a scumbag could watch you enter your PIN, call to his accomplice who'd bean you in the head for your wallet, and now they've got your card AND your PIN--and soon your money too.
The keypad I'm referring to was on a Canadian Army secure building. The keys are clear Lexan and they've got a seven-segment display in each key. You press a button and the figures are scrambled around so they're never in the same order twice. By adding little solenoids they could have Braille on the keys. No one could ever figure out a PIN again just by watching your fingers. This can't be super expensive and it would be much more secure than what we've already got.
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