IBM Computer Hardware 2 Manual de usuario descargar pdf (Pagina 464)

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101

CCA Release 2.54

IBM 3624 PIN Offset Calculation Method

The IBM 3624 PIN Offset calculation method is the same as the IBM 3624

PIN-calculation method except that a step is added after the A-PIN is calculated to

calculate or use an offset, O-PIN:

 To calculate an O-PIN, the additional step subtracts (digit-by-digit, modulo 10,

with no carry) the calculated A-PIN from the customer-selected C-PIN.

The result is an O-PIN (offset) of n decimal digits, where n is the PIN length

and must be in the range from 4 to 16. The PIN_check_length parameter

specifies n as the low-order (rightmost) digits of the n-digit PIN offset. The

O-PIN (offset) is not encrypted.

 To use an offset to verify a trial PIN, the additional step adds (digit-by-digit,

modulo 10, with no carry) the offset to the calculated A-PIN. The result is

compared to the customer-entered trial PIN (T-PIN).

Notes:

1. The digit-wise subtraction is defined only for digits in the range from

X'0' to X'9'. Any other value is not valid and causes processing to fail.

2. The length of the offset depends on the length of the PIN and must be less

than or equal to the length of the PIN. The financial institution that issues the

magnetic-stripe card determines the length of the PIN offset, which you specify

with the PIN_check_length parameter.

3. When the length of the PIN offset is less than the length of the calculated PIN,

the subtraction or addition begins with the low order PIN digit.

E-4 IBM 4758 CCA Basic Services, Release 2.54, February 2005

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