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CCA Release 2.54
ISO-1 PIN-Block Format
The ISO-1 PIN-block format is equivalent to an ECI-4 PIN-block format. The ISO-1
PIN-block format supports a PIN from 4 to 12 digits in length. A PIN that is longer
than 12 digits is truncated on the right.
The following is the ISO-1 PIN-block format:
1 2 3 4 5 6 7 8 9 1 11 12 13 14 15 16
┌───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┬───┐
│ 1 │ L │ P │ P │ P │ P │P/R│P/R│P/R│P/R│P/R│P/R│P/R│P/R│ R │ R │
└───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┴───┘
Figure E-4. ISO-1 PIN-Block Format
where:
1 Is the value X'1'.
L Is the length of the PIN, which is a 4-bit value from X'4' to X'C'.
P Is the PIN digit, which is a 4-bit value from X'0' to X'9'. The values
of the PIN digits are independent.
R Is a random digit, which is a value from X'0' to X'F'. Typically, this
should be used for predetermined transaction unique data such as a
sequence number.
P/R Is a PIN digit or a random digit, depending on the value of PIN length
L. The number of random digits is in the range from 2 to 10, and the
random digits can be different.
Example:
L=6, PIN = 123456, L = X'6'.
PIN block = X'161234566ABCFDE1', where X'6', X'A', X'B', X'C', X'F',
X'D', X'E', and X'1' are the random fillers.
Appendix E. Financial System Verbs Calculation Methods and Data Formats E-11