, The Register 2003-02-21
Cambridge researchers have documented a worrying PIN cracking technique against the hardware security modules commonly used by bank ATMs.
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How to get an ATM PIN number in 15 guesses
2003-02-22
Anthony M. Saffer <anthony (at) safferconsulting (dot) com [email concealed]>
Anthony M. Saffer <anthony (at) safferconsulting (dot) com [email concealed]>

Try one (or 2) PINs per day. If all you need is ~15-20 tries, you have only a few weeks work ahead of you.
Obviously, the better way to get a PIN is a simple hidden camera.
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Link to this comment: http://www.securityfocus.com/comments/articles/2584/18281#18281