Kenwood NX-5000 Series Function Reference page 144

3 COMMUNICATION SECURITY
3.7 Protection Function of Encryption Key (Key Retention)
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Timed
If the transceiver is turned OFF for a duration longer than the duration configured by using the FPU, and if the ESN is
inconsistent, the encryption key data is deleted. For the duration that can be configured by using the FPU, 1, 3, 7, 10,
or 30 (days) can be selected. By directly editing the memory map, a value other than the values above can also be
configured.
In addition to when the transceiver is turned OFF, in consideration that the battery pack may be removed, the date and
time history of when the transceiver is turned OFF is backed up once an hour while the transceiver behaves in user
mode.
Note
The time configured for Duration is counted down using the internal clock. The internal clock operates on a built-in
rechargeable lithium battery pack if the battery pack of the transceiver is detached. The lithium battery pack is
automatically charged from the battery pack connected to the transceiver.
If the battery pack is removed, the battery life of the built-in lithium battery pack is approximately 2 weeks.
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Infinite
If the SCM is configured, the encryption key data is deleted only when the ESN is determined as inconsistent.
Since the security level of this configuration (Infinite) is low, using this configuration along with Transceiver Password
is recommended. If Transceiver Password is configured, the Encryption Key will be deleted if an incorrect password is
entered 15 times in a row. For Transceiver Password, refer to Common FUNC
(Transceiver Password)".
Note
Encryption Key data is deleted when the transceiver is turned ON. However, Encryption Key data is deleted immediately
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only if the SCM is detached from the transceiver, while the power source is supplied to the SCM.
If the SCM installed in the transceiver is uninstalled and is reinstalled in another transceiver, the Encryption Key data is
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deleted regardless of the configuration for Key Retention.
Built-in DES/ Enhanced Encryption
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Infinite
An Encryption Key is not deleted. The transceiver behaves as an ESN is always matched.
0
Timed
If the transceiver is turned OFF for a duration longer than the duration configured by using the FPU, the encryption key
data is deleted. For the duration that can be configured by using the FPU, 1, 3, 7, 10, or 30 (days) can be selected. By
directly editing the memory map, a value other than the values above can also be configured.
In addition to when the transceiver is turned OFF, in consideration that the battery pack may be removed, the date and
time history of when the transceiver is turned OFF is backed up once an hour while the transceiver behaves in user
mode.
Note
The time configured for Duration is counted down using the internal clock. The internal clock operates on a built-in
rechargeable lithium battery pack if the battery pack of the transceiver is detached. The lithium battery pack is
automatically charged from the battery pack connected to the transceiver.
DMR FUNC (K, F)/Ver 2.20
"Password for Transceiver Operation
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