E F Johnson Company 2425M80 Benutzerhandbuch

Draft 02 - Sep 1 2015

7-10

The following are the minimum parameters that need to be programmed in the radio to 
perform OTAR. It is not necessary to program a TEK but it is necessary that a UKEK be 
manually programmed to perform OTAR. If the radio does not contain a TEK, the KMF 
initiates a warm start-up sequence in which a temporary TEK is transferred to the radio to 
perform the key transfer.

UKEK - This key normally has SLN (CKR) 61440 for DES protocol, SLN (CKR) 
61442 for AES protocol, and Key ID 62880 (F5A0 hex). 

Unit RSI - This is normally initially the same as the P25 Unit ID and is set by 
programming.

KMF RSI - This RSI is normally 9,999,999 and should not need to be loaded since it 
defaults to this number. 

Verify that the above information was properly stored in the radio by viewing it using the 
keyloader.

The Over-the-Air-Rekeying (OTAR) capabilities of the SEM-equipped Viking Series 
mobile are as follows. 

• 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 126 keys. However, 16 or less are normally used. 

The following additional option switches can be programmed with the Viking mobile to 
control OTAR functions.

Change Keyset - Toggles the active keyset between Keyset 1 and Keyset 2. The new 
active keyset is briefly displayed and then normal operation resumes. To change to the 
other keyset, highlight it and press the Select Knob.

Clear/Secure - This enables and disables encryption regardless of whether OTAR is 
used. Refer to Section 7.3 for more information.

Erase Keys - Erases all TEK and KEK keys contained in the radio.