4.6
Built-in DES
The Encryption function by means of DES (Built-in DES) can be used by enabling
DES 4 Keys
by using KPG-D1/ D1N.
The Encryption function by means of DES (Built-in DES) can encrypt and decrypt communication data during voice
communication or data communication by configuring an Encryption Key (Key ID and Key Data) in Multi-key List. The
transceiver can have a maximum of 4 Encryption Keys of Built-in DES (Key ID and Key Data). (Refer to
.)
Note
0
SCM and Built-in DES cannot be used at the same time.
0
If the transceiver with an SCM installed is turned ON while the Encryption Key of Built-in DES is configured for the
transceiver, the SCM is not initialized, and encrypted communication is executed by using Built-in DES.
Configuration using KPG-D1/ D1N
Configuring
DES 4 Keys
to be enabled or disabled (
Model > Product Information > Feature Selection)
4.7
Protection Function of Encryption Key (Key Retention)
Key Retention
is the function to retain or delete Encryption Key information stored in the SCM or the Encryption Key
configured for Built-in DES according to the configuration using KPG-D1/ D1N.
Using this function, Encryption Key data can automatically be deleted, for instance, in case the transceiver is stolen or the
transceiver has been left unused.
The behavior of the transceiver varies depending on the configuration in
Key Retention
as shown below:
SCM
0
Disable
Since the security level is high, this configuration is the default. If the SCM is configured, the encryption key data is
deleted when Tamper is detected or when the ESN is determined as inconsistent.
The behavior specifications of when Tamper is detected under each condition are as follows:
Table 4-4 Behavior Specifications
Power Off
About Encryption Key Data
Conditions
With the battery removed
Less than 30 sec (power off time)
The encryption key data is still retained when the
transceiver is turned ON again.
Elapse of 30 sec or more (power off
time)
The encryption key data is deleted when the
transceiver is turned ON again.
If the SCM is temporarily removed
The encryption key data is deleted when the
transceiver is turned ON again.
With the battery attached
Less than 30 sec (power off time)
The encryption key data is still retained when the
transceiver is turned ON again.
Elapse of 30 sec or more (power off
time)
The encryption key data is still retained when the
transceiver is turned ON again.
If the SCM is temporarily removed
The encryption key data is deleted when the
transceiver is turned ON again.
4 COMMUNICATION SECURITY
4.6 Built-in DES
P25 FUNC (K)/Ver 2.20
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