Operating instructions

ES Series Models II/III Portable Radio Operating Manual 11-9
Secure Communication (Encryption)
- 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.
11.5.1 OTAR Option Buttons
The following additional option buttons can be programmed with the ES Series 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> button.
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.
Key Select - This allows a different key to be selected for the current channel or group
(conventional channels only). Refer to Section 11.2.4 for more information.
11.5.2 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 button
described in the preceding section. (Can be option button 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 - (Not supported in Motorola's P25 Trunking OTAR.) 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.
Erase Keys - Erases all keys in the radio the same as the Erase Keys option button
described in the preceding section. (Can be option button or menu parameter.)