Kenwood NX-5000 Series Function Reference page 133

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3 COMMUNICATION SECURITY
COMMUNICATION SECURITY
Encryption is the function that enhances confidentiality in communications on the DMR digital channels by encrypting audio
data and user data such as Short Message.
The following Encryption functions can be used in a DMR Conventional system.
0
Bit scramble encryption type
0
AES/ DES encryption type
0 DES encryption type (Built-in DES)
0 Enhanced Encryption format
The AES/ DES encryption function offers enhanced encryption strength compared to encryption functions using the bit
scrambling format or the DES (Built-in DES) or Enhanced Encryption format. To make use of the AES/ DES encryption
function, it is necessary to mount the optional Secure Cryptographic Module (henceforth "SCM") to the transceiver and write
the encryption key data to the SCM. (Refer to
When a transceiver transmits or receives a signal in the bit scrambling, DES (Built-in DES) or Enhanced Encryption format,
the communication data is encrypted or decrypted using the encryption key data configured in the transceiver. In comparison,
the AES/ DES method encrypts or decrypts the communication data using the encryption key data configured for SCM.
Transmission
If Encryption is enabled, the transceiver encrypts and sends out audio data or user data such as Short Message. If Encryption
is disabled, the transceiver transmits communication data without encryption.
Reception
Upon receipt of the encrypted communication data, the transceiver decrypts the received data using the encryption key data
configured in the transceiver or SCM. If the data is properly decrypted, the received audio sounds from the speaker. The
receive behavior of the transceiver, however, differs depending on the Encryption status (enabled or disabled) and the
configuration for Encryption Type. Refer to
details.
About the configuration of encryption key data
By using the KPG-D1/ D1N, it is possible to configure up to a total of 32 encryption key data used by encryption functions
in the bit scrambling, DES (Built-in DES) or Enhanced Encryption format as well as encryption key information used by the
AES/ DES encryption function in the Multi-key List. The Encryption status (to be enabled or disabled) and the Multi-key
List Number with the encryption key data can be configured for each channel. (Refer to
When the SCM uses the AES/ DES method, up to 1,024 encryption key data can be stored inside the SCM. The encryption
key data that is linked to the CKR ID of the Multi-key List can be selected. The Multi-key List can be configured to contain
a combination of encryption key data in the bit scrambling or Enhanced Encryption format and encryption key information
in the AES/DES format.
When the SCM uses the DES (Built-in DES) format, up to 4 encryption key data can be stored inside the built-in memory
of the transceiver. The encryption key data that is configured in the Multi-key List can be selected. The Multi-key List can
be configured to contain a combination of encryption key data in the bit scrambling, Enhanced Encryption and DES (Built-
in DES) formats.
Also, the Encryption status (enabled or disabled) and Encryption Key used for communications can be changed by the
transceiver operation.
DMR FUNC (K, F)/Ver 2.20
Secure Cryptographic Module (SCM) (for AES/ DES
"Transceiver Behavior upon Receipt of Encrypted Communication
Only).)
Multi-key List.)
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