Kdc Call Variable; N E T V A R I A B L E; Kdc Unique Variable - Philips SPENDEX 40 Operating Manual
Speech encryptiun decryption equipment for use on nato-ivsn system incorporating kdc
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Also See for SPENDEX 40:
- Maintenance manual (65 pages) ,
- Operating instructions manual (21 pages)
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NATO RESTRICTED
S P E N D E X
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O P E R A T I N G
M A N U A L
KEY VARIABLE SETTINGS
2 . 1
G e n e r a l
For the purpose of secure communication the following types of key
variables are available to the terminal:
- KDC call variable
- Net variable
- KDC unique variable
The KDC unique variable and the Net variable are loaded into the
SPENDEX 40 from a loading device KYK-13 or a tape reader KOI-18 and
are stored in encrypted form in a memory. This memory receives its
supply from the battery, so that its contents are not lost in the
event of a power breakdown.
2 . 2 K D C C a l l V a r i a b l e
A KDC call variable is a key variable used to set up a secure call
with a terminal of type SPENDEX 40 or of type STU-II. The call
variable will have to be requested from the KDC. A received KDC call
variable can be stored in encrypted form temporarily or permanently.
The memory has space for the temporary storage of 1 KDC call variable
and the permanent storage of at the most 20 KDC call variables
(compartments 40...59).
Secure communication based on a KDC call variable is possible only if
both terminals are provided with their KDC unique variable.
2 . 3 N e t V a r i a b l e
The Net variable is a key variable for setting up a secure call with
a terminal of type SPENDEX 40 or of type STU-II. The Net variable
shall be used only for emergency cases if no KDC call variable is
present in the terminal and communication with the KDC is for some
reason or other not possible. The Net variable for emergency cases is
stored in compartment 00 of the memory.
Note: The remaining compartments 01...19 for storing other Net
variables are not used in the NATO-IVSN system.
2 . 4 K D C U n i q u e Va r i a b l e
The KDC unique variable is a key variable, unique per terminal, which
is required for the decryption of a KDC call variable. Without the
KDC unique variable, secure communication based on a KDC call
variable is not possible.
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NATO RESTRICTED
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