User's Manual

Table Of Contents
8-6 Viking Portable 600 Radio Operating Manual
Secure Communication (Encryption)
8.3.3 Talkgroup Encryption Override
Conventional digital (P25), Smartnet/Smartzone and P25 Trunking encryption strapping is
programmed on a “per talkgroup” basis. However conventional digital and P25 trunking
talkgroup encryption strapping can be overridden on a “per channel” basis.Therefore, if
desired on Conventional Digital and P25 Trunking channels, encryption can be
programmed differently for each channel. Conventional analog channel encryption is
always programmed on a per-channel basis.
8.4 Over-The-Air Rekeying (OTAR)
Over-The Air-Rekeying (OTAR) is the process of sending encryption keys and related key
management messages over-the-air to specific radios. The advantage of OTAR is that it
allows these keys to be quickly and conveniently updated when necessary. It is no longer
necessary to periodically travel to the radio location or bring the radio into a maintenance
facility to load new keys.
The actual OTAR rekeying functions are performed by a Key Management Facility
(KMF) that sends Key Management Messages (KMM) to the radios. These messages are
themselves encrypted using an encryption key. Radios must be OTAR-compatible and
programmed for OTAR for this type of rekeying to occur.
Note The RSI is enabled in the KMF and must be assigned to the radio by programming.
OTAR is available only on P25 conventional and trunked channels, and only to program
DES-OFB and AES keys. It is not used on SmartNet/SmartZone channels or to load DES
keys.
8.4.1 Motorola Third-Party RNC Registration
The Viking VP600 radio supports Motorola dynamic data registration. However, if
desired, the radio can be programmed to perform MOT 3rd Party data registration instead
of dynamic registration on the OTAR and Data parameters page. If MOT 3rd Party
registration is selected, the radio must be manually registered on the Motorola RNC
Console by entering the following command:
LCRD 03 06 00 1234 7F xx xx xx 0A 0A 00 07 00 yy
Where, “xx xx xx” is the hex value of the Digital Unit ID programmed. Refer to the
console documentation for the value of “yy” or use “00”. This registration needs to be
done only once.
Preliminary Draft 3/9/12