Enter MAC Master Key

NOTE: A MAC Master Key will only be used when it is required by the processor and has been enabled as a communication configuration option.
If required, obtain the MAC Master Key from the processor. It must be entered before the MAC Working Key can be downloaded.

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.

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, B, C, D, E, F).

Steps:

1 Use the keypad in conjunction with the on-screen keypad on the control panel to enter the MAC Master Key into the dialog box. Follow the keypad and function key orientation (layout) as illustrated by the graphic panel on the right side of the screen. As each character of the key is entered on the keypad, an asterisk is displayed in the dialog box. After all 32 characters of the first key part have been entered from the keypad, press ENTER.

2 A dialog box will appear and display the check digits for the key. Verify the check digits match the check digits provided by the processor.

3 If they match, press ENTER to accept the key. A second dialog box appears to alert that a second part of the key is needed. Press ENTER again to return to the Enter MAC Master Key screen shown above to provide the second part of the MAC Master Key. Once the second part of the key is entered, and the check digits match those provided by the processor, pressing ENTER will display a successful entry of the MAC Master Key. View

4 If the returned check digits do not match, press CANCEL on the keypad. The existing key will not change.

a. Press ENTER to return to the Key Management screen.

b. Select the Enter MAC Master Key option by pressing 1 on the keypad and repeat the steps for entering a key part.