Operating Manual Part 15
Table Of Contents
- Safety Information
- General
- Controls And Display
- General Operation
- Radio Wide Features
- Conventional Features
- 5.1 Monitoring Before Transmitting
- 5.2 Monitor Mode
- 5.3 Busy Channel Lockout
- 5.4 Call Guard Squelch
- 5.5 Penalty Timer
- 5.6 Conversation Timer
- 5.7 Repeater Talk-Around
- 5.8 Displaying Transmit / Receive Frequency
- 5.9 Emergency Alarm and Call
- 5.10 Conventional Mode Scanning
- 5.11 Standard Conventional Calls
- 5.12 DTMF / ANI Signaling
- 5.13 Project 25 Mode Features
- 5.14 Keypad Programming
- 5.15 Text Messaging
- 5.16 Sending Global Positioning System (GPS) Data
- SMARTNET / SmartZone / P25 Trunked Features
- 6.1 Analog and Digital Operation
- 6.2 Viewing Unit ID
- 6.3 Standard Group Calls
- 6.4 Private (Unit-To-Unit) Calls
- 6.5 Telephone Calls
- 6.6 Call Alert
- 6.7 Messaging
- 6.8 Sending Status Conditions
- 6.9 Emergency Alarm and Call
- 6.10 Failsoft Operation
- 6.11 SMARTNET / SmartZone / P25 Trunked Scanning Features
- 6.12 Dynamic Regrouping
- 6.13 SmartZone and P25 Trunking Unique Features
- 6.13.1 Busy Override
- 6.13.2 Site Trunking
- 6.13.3 Determining Current Site and Searching for a New Site
- 6.13.4 Locking / Unlocking a Site
- 6.13.5 Auto Site Search
- 6.13.6 ZoneFail Site Lock
- 6.13.7 P25 Wide Area Scan
- 6.13.8 Normal P25 and SmartZone Control Channel Hunt
- 6.13.9 Talkgroup Steering through System Access Permissions
- 6.13.10 P25 Wide Area Scan
- 6.14 P25 Trunking Unique Features
- Miscellaneous
- Determining Available Options
- Password Description
- Secure Communication (Encryption)
- Service Information
10-2 5300 ES Series Mobile Radio Operating Manual October 2008
Secure Communication (Encryption)
10.1.2 AES (Advanced Encryption Standard)
An encryption standard called 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 (see
Section 10.2), and not by the PC Configure programming software. 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).
10.1.3 Encryption Available With Various Channel Types
Analog Channels - On analog conventional and SMARTNET/SmartZone channels, DES
encryption provides secure communication.
Digital Channels - On digital Project 25 and SMARTNET/Smart Zone channels, the
DES-OFB or AES-OFB protocol is used.
10.1.4 FIPS and Non-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. All 5300 ES
models are FIPS certified.
10.2 Encryption Keys
An encryption key is a cryptographic variable that is required by the encryption algorithm
to encrypt and decrypt voice or data. To maintain system security, these keys must be
protected from disclosure and also periodically replaced or updated.
With the AES and DES encryption used by EFJohnson Technologies radios (see Section
10.1), the same encryption key is used by both the encrypting (sending) and decrypting
(receiving) radio. AES encryption keys are generated from a string of 64 hexadecimal
characters, and DES keys are generated from a string of 16 hexadecimal characters.
Another four hexadecimal characters are used to specify the key ID. Multiple keys can be
loaded into a radio using OTAR or manual loading.