11-2
ES Series Models II/III Portable Radio Operating Manual
Secure Communication (Encryption)
• DES-OFB - A form of DES encryption for digital channels that uses output feedback.
This protocol does not result in the degraded range that occurs with analog channels.
11.1.2 AES (Advanced Encryption Standard)
The encryption standard AES is replacing DES-OFB encryption on digital (P25) channels.
It uses a 128-, 192-, or 256-bit encryption key instead of the 64-bit key used with DES.
EFJohnson Technologies radios currently support only 256-bit AES keys. The type of
encryption (DES or AES) is determined by the type of encryption key that is loaded. AES
encryption, like DES encryption, is an optional radio feature that must be purchased and
then enabled at the factory (or by a factory-created option file).
Note
The 51SL ES Series radios are dual encryption. Either DES or AES encryption is available
(not both). Single key DES is standard when P25 is ordered.
Either DES encryption or AES encryption is optional for the 51FIRE ES Series.
Note
Multi-Net does not support encryption.
11.1.3 Encryption Available With Various Channel Types
Analog Channels
- On analog conventional and SMARTNET/SmartZone channels, DES
encryption provides secure communication.
Digital Channels
- On conventional P25, SMARTNET/Smart Zone, and P25 Trunking
channels, the DES-OFB or AES-OFB protocol is used.
Note
DES can ONLY operate on wideband (4k or 5k) channels: NOT on narrowband (2.5k)
channels.
11.1.4 FIPS Modes
FIPS 140-2 is a Federal Information Processing Standard for encrypted radios used by the
Federal Government. This standard specifies Federal security requirements for
cryptographic modules for a wide range of applications and environments.
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