How to get an ATM PIN number in 15 guesses

The Register reports a worrying attack on PIN numbers, although “the risk of attack comes from a corrupt insider, perhaps in computer operations and with access to sensitive manuals, who might be able to use the attack to refine what would otherwise be a brute force attempt to guess PIN numbers.” And with a maximum of 3 or 4 attempts at an ATM nobody’s going to do this on the street. Probably.

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