4.9.3.1
Viewing Air Encryption State
Procedure:
1 From the home screen, press the Menu key.
2 Select Security → AirEncrypt.
Your radio displays:
• Air Encryption Is Off.
• Air Encryption Is On.
4.9.3.2
Deleting User Keys
Prerequisites: Ensure that the user key deletion is enabled in the codeplug.
Procedure:
1 Press Side Button 1 → Side Button 1 → Side Button 1 → Side Button 2 → Side Button 2 →
Side Button 2.
IMPORTANT: The key deletion takes up to 30 seconds. During the period, the battery
must not be removed. Removing the battery during that period may lead to radio
malfunction.
Encryption and/or Authentication keys are deleted. The radio enters Temporary Disable state and the
service provider must manually restore it.
4.9.4
K Validity
Key (K) is a secret key the infrastructure uses to authenticate the radio in the system. It is part of the
authentication that provides service confidentiality between your radio and the system.
4.9.4.1
Verifying K Validity
Procedure:
1 From the home screen, press the Menu key.
2 Select Security → K Validity.
3 Your radio displays:
• K is Valid – the infrastructure can authenticate your radio.
• K is Invalid – the infrastructure is unable to authenticate your radio. Please call your
service provider to restore the key to your radio.
4.9.5
SCK (Air Interface Encryption Class 2)
Static Cipher Key (SCK) is a secret key used for the Air Interface Encryption Class 2. It may be used to
encrypt calls and data in TMO and DMO. The SCK air interface encryption provides service
confidentiality between radios and infrastructure when in TMO, and between radios when in DMO. A
MN002041A01-AH
Chapter 4: Main Menu
103
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