User Manual Part 1

Digital Project 25 and SMARTNET/SmartZone Channels

• DES-OFB (Output Feedback)

• AES

1.11.2 FIPS 140-2 APPROVED ENCRYPTION

All encrypted 4300 models are Federal Information Processing Standard (FIPS) certified for

the DES-OFB and AES encryption modes. Encryption on analog channels is not FIPS certified.

FIPS 140-02 is approved by the United States Secretary of Commerce. This standard specifies

federal security requirements for cryptographic modules for a wide range of applications and

environments.

1.11.3 OVER-THE-AIR-REKEYING (OTAR)

Encryption keys are loaded into the radio by Over-The-Air-Rekeying (OTAR) using a

KMF (Key Management Facility) and/or a handheld keyloader such as the EFJohnson SMA

(Subscriber Management Assistant) or Motorola KVL 3000 Plus with the AES option.

The keyloader is connected directly to the radio using an interconnect cable, and it loads

DES, DES-OFB, and AES keys. OTAR can be used to load DES-OFB keys on Project 25

conventional channels

1.11.4 KEY RETENTION

NOTE: The 4300 radio has a security feature (pushbutton switch S1 on the logic board) that

automatically erases the encryption keys when the bottom cover is removed (except when Infinite

Key Retention is programmed as follows).

If Infinite Key Retention is programmed, the keys are maintained in memory indefinitely,

even without power applied. If it is not programmed, the transceiver must be connected to an

unswitched power source to preserve the encryption keys in memory. However, a storage

capacitor (C173) maintains the 5-volt supply (and the encryption keys) for approximately 8

hours if power is temporarily lost.

1.12 RF SAFETY INFORMATION

Before using your mobile two-way radio, read this important RF energy awareness and

control information and operational instructions to ensure compliance with the FCC’s RF

exposure guidelines.

NOTICE: This radio is intended for use in occupational/controlled conditions, where users have

full knowledge of their exposure and can exercise control over their exposure to meet FCC limits.

This radio device is NOT authorized for general population, consumer, or any other use.

This two-way radio uses electromagnetic energy in the radio frequency (RF) spectrum to

provide communications between two or more users over a distance. It uses radio frequency (RF)