User's Manual

ENCRYPTION
CES-128 VOICE ENCRYPTION
ENVOY™ TRANSCEIVER REFERENCE MANUAL 301
The transceiver returns to secure mode after any one of the following:
• the end of the period is reached
• you press PTT to begin transmission
• you receive encrypted audio from another station
The time required depends on the length of time the called station takes to tune the
antenna, typically 12 to 15 seconds.
To set the duration of secure standby:
 From the main menu, select (Settings), then (Security).
 Press or to scroll to the Standby After Selcall entry.
 Press or to select the value that you want to set, or enter the number directly.
 Press (Save) to save the information.
 Press (Close).
Related links:
Standby After Selcall on page 237
Base key
The CES-128 voice encryptor uses a Base secure key in secure index 0. This key,
along with the selected secure key in a Corporate secure index, is used as the seed for
the encryption algorithm. The Base secure key may be changed using a CICS
command (secure key #0 key) or via the control point. Changing the Base secure
key changes the seed for the encryption algorithm. Transceivers must use the same
Base secure key and secure key in a Corporate secure index for successful secure
communication.
NOTE: Only the Base secure key is combined with a secure key in a Corporate
secure index for use in the encryption algorithm.