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Automated tellers -- Security measures

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View Resource Technical Report: Decimalisation Table Attacks for PIN Cracking

An extremely controversial find by two University of Cambridge researchers has exposed a security weakness in the cryptographic systems used by banks to store personal identification numbers for automatic teller machine cards. The discovery is described in a February 2003 technical report, which states that the vulnerability can be exploited by malicious users to crack the PIN in fifteen guesses,...

https://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-560.pdf