Operating Manual

10-14 5100 ES Models II/III Portable Radio Operating Manual March 2008
Secure Communication (Encryption)
10.5.2 OTAR Option Switches
The following additional option switches can be programmed with the 5100 ES portable to
control OTAR functions. They are also available as 5100 ES 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 ES 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 10.3 for more information.
Erase Keys - Erases all TEK and KEK keys contained in the radio.
Key Select - This allows a different key to be selected for the current channel or group
(conventional channels only). Refer to Section 10.2.4 for more information.
10.5.3 Additional Functions Selectable by 5100 ES Menu
To select a parameter, highlight it and press <F2>.
Rekey - Performs the same function as the OTAR Rekey Request option switch
described in the preceding section. (Can be option switch or menu parameter.)
Need KEK - Sends a request for a new Key Encryption Key (KEK). Upon receiving
this message, the KMF marks the radio as requiring service. One time this function may
be selected is if the radio dumps it keys.
Identify - Sends a message which tells the KMF that the radio is on the air. Currently,
the KMF will usually either echo the message back to the radio or respond with a No
Service KMM. This function can be used to test communication without initiating the
rekeying that occurs with the preceding “Rekey” function.
NO SERVICE 0x17
REKEY ACK 0x1D
OTAR REGISTRATION 0x25
OTAR REGISTARTION RESPONSE 0x26
REKEY 0x1E
UNABLE TO DECRYPT 0x27
WARM START 0x20
ZEROIZE 0x21
ZEROIZE RESPONSE 0x22