Filter
Top Products
CCA Release 2.54
Interbank PIN-Calculation Method
The Interbank PIN-calculation method consists of the following steps:
1. Let X denote the transaction_security_parameter element converted to an array
of sixteen 4-bit numeric values. This parameter consists of (in the following
sequence) the 11 rightmost digits of the customer PAN (excluding the check
digit), a constant of 6, a 1-digit key indicator, and a 3-digit validation field.
2. Encrypt X with the double-length PINGEN (or PINVER) key to get 16
hexadecimal digits (64 bits).
3. Perform decimalization on the result of the previous step by scanning the 16
hexadecimal digits from left to right, skipping any digit greater than X'9', until 4
decimal digits (for example, digits that have values from X'0' to X'9') are
found.
If all digits are scanned but 4 decimal digits are not found, repeat the scanning
process, skipping all digits that are X'9' or less and selecting the digits that
are greater than X'9'. Subtract 10 (X'A') from each digit selected in this
scan.
If the 4 digits that were found are all zeros, replace the 4 digits with 0100.
4. Concatenate and use the resulting digits for the Interbank PIN. The 4-digit PIN
consists of the decimal digits in the sequence in which they are found. The
PIN is not encrypted.
E-8 IBM 4758 CCA Basic Services, Release 2.54, February 2005