Motorola TETRA MTM800, Feature User Manual, Page: 120 / 382

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Air Encryption Key Deletion
Please check with your Service Provider whether the
terminal is provided with air interface encryption keys.
You can delete the air interface encryption keys from the
terminal by entering the following sequence from the keypad:
* * 0 0 # #
K Validity
From the main menu, select > Security > K Validity .
K (Key) is a secret key the infrastructure uses to authenticate
the MTM800 Enhanced in the system. It is part of the
authentication that provides service confidentiality between
your MTM800 Enhanced and the system.
To verify K validity, press
Select . The display will show one of
the following messages:
• K is Valid — the infrastructure can authenticate your
MTM800 Enhanced.
• K is Invalid — the infrastructure shall not authenticate
your MTM800 Enhanced. Please call your Service
Provider to restore K to your MTM800 Enhanced.
TMSCK Validity
From the main menu, select > Security > TMSCK Validity .
SCK (Static Cipher Key) is a secret key the infrastructure
uses to encrypt call and data in the system. Air interface
encryption provides service confidentiality between your
MTM800 Enhanced and the system. Your MTM800
Enhanced should be provided with a set of SCKs.
Using this feature will disable the terminal,
and your Service Provider will need to re-
enable the terminal.
Deletion should be performed in idle TMO/DMO or Emergency
Operation.