User's Manual

SECURE COMMUNICATION (ENCRYPTION)
63
4. MNP (Message Number Period) - Load the proper
message number period into the radio (typically
1000). Refer to Section 11.4.6 for more information.
5. Verify that the above information was properly
stored in the radio by viewing it using the keyloader.
11.6 RADIO OTAR CAPABILITIES
11.6.1 SEM 5100/5300, STANDARD 5100
The OTAR capabilities of the SEM equipped
5100 portable and 5300 mobile and also standard
(Version 1.x) 5100 are as follows. Refer to Section 9
for more version information.
Keysets
• Up to three keysets are used and it is assumed all
three are always present.Keyset IDs 1 and 2 are for
TEKs and only one is active at a time. Keyset ID 255
is for KEKs and is considered active all the time
• Each keyset can have up to 128 keys. However, 16
or less are normally used.
• AES encryption is supported (with Flash code 1.8.0
or later) but not currently available with OTAR
(future availability is planned).
RSI (Radio Set Identifier)
• One individual RSI and it is usually initially the
same as the P25 Unit ID.
• One group RSI (usually initially “0”).
• One KMF RSI (usually always 9,999,999).
OTAR Messages That Are Supported
The following KMM Message IDs are recognized
by or sent:
CHANGE RSI 0x03
CHANGE RSI RESPONSE 0x04
KEYSET CHANGEOVER 0x05
KEYSET CHANGEOVER RESPONSE 0x06
DELAYED ACK 0x07
HELLO 0x0C
INVENTORY 0x0D
INVENTORY RESPONSE 0x0E
MODIFY KEY 0x13
MODIFY KEYSET ATTRIBUTES 0x14
MODIFY KEYSET ATTRIBUTES RESPONSE0x15
NEGATIVE ACK 0x16
NO SERVICE 0x17
REKEY ACK 0x1D
REKEY 0x1E
WARM START 0x20
ZEROIZE 0x21
ZEROIZE RESPONSE 0x22
11.6.2 UCM EQUIPPED 5300
The 5300 UCM versions (see Section 9) use the
Motorola UCM encryption module. Therefore, the
OTAR capabilities are determined by that module. All
capabilities of the Motorola KVL and KMF are
supported. Initial radio programming by the PCCon-
figure software is the same as described in
Section 11.5.
11.6.3 OTAR OPTION SWITCHES
The following additional option switches can be
programmed with the 5100 portable and 5300 mobile
to control OTAR functions. They are also available as
5100 menu parameters unless noted otherwise.
Change Keyset - Toggles the active keyset between
Keyset 1 and Keyset 2. The new active keyset is
briefly displayed and then normal operation resumes.
When the 5100 menu is used, the current active keyset
is indicated by an asterisk. To change to the other
keyset, highlight it and press the F2 key.
Clear/Secure Select - This enables and disables
encryption regardless of whether OTAR is used. Refer
to Section 11.3 for more information.
Erase Keys - Erases all TEK and KEK keys contained
in the radio. With the 5100, this function is available
as menu parameter only.
Key Select - This allows a different key to be selected
for the current channel or group (conventional chan-
nels only). Refer to Section 11.2.5 for more
information.