Figure 21-5. PROJ 25 CONV Mode Screen
21-7 PROJ 25 CONV ENCRYPTION SET
UP
21-7.1 SET UP Encryption Display
The SET UP display
places the analyzer in
encryption setup mode and allows the operator to
select the desired algorithm. The SET UP display
is accessed from the Display Zone. To use SET
UP display, move the cursor to the “Display:”
field and select SET UP using the SET UP
softkey. The Display Zone will show a menu of
SET UP options as shown in Figure 21-6.
21-7.1.1 Encrypt
The analyzer operates in either clear or encrypted
modes. In the Display Zone, scroll the cursor to
the “Encrypt:” field and select ON as shown in
Figure 21-7 for encrypted PROJ 25 CONV, or
OFF for clear PROJ 25 CONV operation.
21-7.1.2 Algorithm Select
W
ithin the SET UP display, the type of algorithm
can be selected. Algorithm is a term that
describes the method of coding data or audio so
that only equipment having the same algorithm
selected and the same key are able to exchange
voice and data information. The analyzer
includes several algorithms recognized by radios
using Project 25. You will need to select these
algorithms to use for processing messages.
In the Display Zone, move the cursor to the
“Algorithm Sel:” field as shown in Figure 21-8.
Softkeys will provide for selection of the
available algorithms. Select the appropriate
algorithm. Refer to 21-4 for a description of the
U.S. and International encryption algorithms.
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