manual
142
X2 Configuration Manual
enter MaC Master Key
aCCess instruCtions:
From the Key Management screen, select the Enter Master Keys option by pressing <1> on the keypad.
From the Enter Master Keys screen, select Enter MAC Master Keys option by pressing <1> on the keypad.
DesCriptions:
MAC is an acronym for Message Authentication Code. The MAC Master Key provides key protection
during manual entry or downloading of the PIN Working Key.
NOTE: A MAC Master Key will only be used when it is required by the processor, and has been enabled
as a communication conguration option.
If required, obtain the MAC Master Key from the processor. It must be entered before the MAC Working
Key can be downloaded.
The MAC Master Key normally consists of a two part, 64-character Triple DES key (32 characters in both
key parts). The MAC Master Key can be made up from the hexadecimal character set (the numbers 0-9 and
the letters A-F).
Follow these steps to enter the MAC Master Key:
D The rst screen to appear asks you to indicate whether this is a “New Key” or “Add Part” to an existing
key that was already entered. Use the <Clear> button on the keypad to select (highlight) the key type eld.
Use the <arrow> button on the keypad to alternate between the 2 options. Select the “New Key” option
when entering a new key or the rst part of a new key. After entering the rst part (32 characters), you will
automatically be prompted to enter the second part.