Pin Ecryption With Diebold Format

Beside Ansi Pin block, another popular for encryption on ATM is Diebold pin block format.Diebold pin block consist 16 hexa block digit and format appear like picture below. The format and encrypted method defined by Pin PAD on FIT (financial instution table) download.


The pin block is created from customer PIN and padding with F character until all completely 16 digit. For example the pin number is 1234 and the pin block is 1234FFFF FFFFFFFF. The lenght of depend o PIN by FIT on coniguration data download.

The encryption process results in 16 hex digits that are converted to ASCII by prefixing each hex digit with a hex 3 to convert the 16 hex digits to 16 ASCII digits. These 16 ASCII digits are sent to the host if the protocol is ASCII