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How to get an ATM PIN number in 15 guesses
Cambridge researchers have documented a worrying PIN cracking technique against the hardware security modules commonly used by bank ATM machines.
Mike Bond and Pietr Zielinski have published a paper detailing how a complex mathematical attack can yield a PIN in an average of 15 guesses. By design, it shouldn't be possible to guess a four-digit pin in less than an average of 5,000 attempts.
The attack, documented in a paper published earlier this week, is directed against the decimalisation tables used to translate between a card PIN and the hexadecimal value of a PIN generated when the hardware security module checks the validity of a number.
The attack works not by going after the PIN number directly but by manipulating the contents of the decimalisation table in order to gain clues (such as which digits are or are not present in the pin).
[ Read more ]
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