E F Johnson Company 2425M80 Benutzerhandbuch

Draft 02 - Sep 1 2015

7-2

An encryption standard called AES (Advanced Encryption Standard) is replacing DES-
OFB encryption on digital (P25) channels. It uses a 256-bit encryption key instead of the 
64-bit key used with DES. The type of encryption (DES or AES) is determined by the type 
of encryption key that is loaded (see Section 7.2). 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).

ARC4 (Alleged Rivest Cipher 4) software encryption uses software keys created in 
Armada and is compatible with Motorola's ADP encryption. ARC4 software encryption is 
an optional radio feature that must be purchased and then enabled by the EFJohnson 
factory (or by a factory-created option file).

Digital Channels - On digital Project 25 and SMARTNET/Smart Zone channels, the 
DES-OFB, AES-OFB, or ARC4 protocol is used.

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. All Viking 
models are FIPS certified.

This feature allows the Authentication features of the radio to be used without the AES or 
DES options. The radio needs to be configured with the Authentication option to use the 
Authentication features of the radio. With this feature addition the radio can perform all 
the Authentication procedures without needing the AES/DES options.