Appendix A Secure Modules
A.1 Universal Crypto Module Kits
The secure modules are designed to digitally encrypt and decrypt voice and ASTRO data in ASTRO
Digital XTL 5000 mobile radios. Tab le A- 1 contains the Universal Crypto Module (UCM) kits and their
corresponding algorithms for secure-equipped XTL 5000 radios.
A.1.1 Secure Interface Boards
Table A-2 contains the secure interface board kits, which are used in conjunction with the UCM kits.
Every secure-equipped radio must contain one of the two secure interface board kits, which is paired
with one of the UCM kits. Refer to Chapter 8. Interconnect Boards Schematics, Component Location
Diagrams, and Parts Lists for illustrations showing the board component locations.
NOTE: The secure modules and secure interface boards are NOT serviceable. The information
contained in this section is only meant to help determine whether a problem is due to the
secure module or the radio itself.
The secure module uses a custom encryption IC and an encryption key variable to perform its
encode/decode function. The encryption key variable is loaded into the secure module, via the
radio’s microphone connector, from a hand-held key-variable loader (KVL). The encryption IC
corresponds to the particular encryption algorithm purchased. The encryption algorithms and their
corresponding kit numbers are listed in Table A-1.
NOTE: When ordering replacement secure modules, make sure that the kit and board numbers of
the module that is ordered are the same as those of the module that is being replaced.
Table A-1. UCM Kit Listing
Kit Number Description
NNTN4006 DES, DES-XL, DES-OFB ENCRYPTION KIT–UCM
NTN9837 DES, DES-XL, DES-OFB WITH DVP-XL ENCRYPTION KIT–UCM
NTN9838 DVI-XL ENCRYPTION KIT–UCM
NTN9839 DVP-XL ENCRYPTION KIT–UCM
Table A-2. Secure Interface Board Kits
Kit Number Description
HLN6876 Secure Interface Board, 3-day key retention
HLN6877 Secure Interface Board, 30-second key retention
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