User Manual

K Validity
K (Key) 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.
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.
SCK (Air Interface Encryption Class 2)
SCK (Static Cipher Key) 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.
TMO SCK
Use of SCKs in TMO needs to be enabled by your service provider. The SCKs used in TMO are called
TMSCKs.
DMO SCK
Use of SCKs in DMO needs to be enabled by your service provider. The SCKs used in DMO are called
DMSCKs.
Changing DMO SCK
Procedure:
1 From the home screen, press the MENU key.
2 Select Security → DMO SCK.
3 Press Next.
4 Radio displays Change to version .
5 Select one of the following:
• Yes — to change the key. Your radio displays Key version changed.
• No — to leave the key. Your radio displays Code Not Changed.
Chapter 5: Main Menu
86 Send Feedback