Chapter 7 Encryption
7.1 Universal Crypto Module Kits
NOTE: This information applies to both conventional and trunked systems.
The encryption modules use a custom encryption IC and an encryption key variable to perform their
encode/decode functions. The encryption key variable is loaded into the encryption module using a
key variable loader (KVL). The encryption IC corresponds to the particular encryption algorithm
purchased.
Table 7-1 contains the Universal Crypto Module (UCM) kits and their corresponding algorithms for
secure-equipped XTL 5000 radios.
7.1.1 Secure Interface Boards
Table 7-2 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.
7.1.2 Secure Dispatch Operation
For personalities or talkgroups that are programmed to be secure-selectable, press and release the
Secure button to toggle between Secure and Clear.
• An illuminated secure status annunciator indicates that the transmitted signal will be encrypted
when the PTT button is pressed.
• The absence of the secure status annunciator indicates that the transmitted signal will not be
encrypted.
Table 7-1. 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 7-2. 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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