Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A decimalization table attack is a technique that may allow a corrupt insider at a bank to discover Personal Identification Numbers (PINs) by exploiting a design flaw in the Hardware Security Module used to protect the PIN. PINs for payment cards are usually generated by encrypting the card number under a secret key held securely by the issuing bank. The encryption produces a hexadecimal value with digits in the range 0 to 9 and A to F. A decimalization table is then used to convert this value to a PIN with digits in the range 0 to 9, for instance mapping A to 0, B to 1, etc.

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