ES Series Models II/III Portable Radio Operating Manual
11-1
S
E C T I O N
Section 11
Secure Communication (Encryption)
This radio may be equipped to provide secure communication on some or all channels.
This feature encrypts the voice so that it can be understood only by someone using a radio
equipped with a similar encryption device and encryption codes.
Note
The Ascend ES does not support encryption on the Multi-Net® protocol, but does support
encryption on other protocols.
When a secure call is received, the LED flashes Red and
is indicated in the display. If
equipped with the Clear/Secure option button and the current channel is programmed to
allow button selection, secure communication can be manually enabled and disabled by
that button. Otherwise, channels are strapped to Clear or Secure operation (see Section
11.3). Secure communication can be programmed on a per channel or per talkgroup basis
to operate in various ways. More information follows.
11.1 Encryption Algorithms
This section provides information about encryption options for the 51xx Model II/III
radios.
11.1.1 SecureNet™
SecureNet encryption digitizes the voice and then encrypts it using the DES algorithm. It
uses a 64-bit encryption key. The SecureNet protocols include the following algorithms:
• DES (Data Encryption Standard) provides a level of security, and also uses cipher
feedback. It was originally designed to be used only by the Federal government.
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