User's Guide

2 Select Security→AirEncrypt.
Your radio displays:
• Air Encryption Is Off – The Air Encryption is not activated.
• Air Encryption Is On – The Air Encryption is activated.
4.9.3.2
Deleting User Keys
IMPORTANT: The key deletion takes up to 30 seconds. During this period, the battery must not
be removed. Removing the battery during this period may lead to radio malfunction.
Prerequisites: Ensure that the user key deletion is enabled in the codeplug.
Procedure:
Press Side Button 1→Side Button 1→Side Button 1→Side Button 2→Side Button 2→Side
Button 2.
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.
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 radio is capable of being loaded with up to 32
SCKs. Specific keys are used for encrypting the air interface.
Any mismatch between radios and/or infrastructure impacts communication – only those using the
same key as the transmitting party are able to decode and hear the communication.
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Chapter 4 : Main Menu
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