Appendix A Secure Modules; Introduction; Table A-1. Astro Digital Spectra Secure Modules; Table A-2. Astro Digital Spectra Plus Secure Modules - Motorola ASTRO Digital Spectra Plus Detailed Service Manual

Appendix A
A.1

Introduction

The secure modules are designed to digitally encrypt and decrypt voice and ASTRO data in ASTRO
Digital Spectra and Digital Spectra Plus mobile radios. This section covers the following secure
modules:
:
NOTE: The secure module is 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 integrated circuit (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 the above table.
NOTE: When ordering replacement 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.
Secure Modules

Table A-1. ASTRO Digital Spectra Secure Modules

KIT NO.
HLN1441
NTN1158
NTN1147
NTN1369
NTN1565

Table A-2. ASTRO Digital Spectra Plus Secure Modules

KIT NO.
NNTN4024A
NNTN4025A
NNTN4026A
NNTN4027A
ENCRYPTION TYPE
DES, DES-XL, DES-OFB
DVI-XL
DVP-XL
DES-XL , DVP-XL
DES-OFB, DVP-XL
ENCRYPTION TYPE
DES, DES-XL, DES-OFB
DVI-XL
DVP-XL
DES, DES-XL , DES-OFB
with DVP-XL Encryption Kit