Radio transceiver unit and a system for control and application of communications
First Claim
1. A radio transceiver unit for use in a radio communications system and operable in a direct mode, the radio transceiver unit comprising:
- means for receiving encrypted information including a communication encryption key for use in direct mode operation (DMO) communications;
means for processing the received encrypted information to derive the encryption key included therein; and
means for conducting encrypted direct mode operation using the communication encryption key, wherein the encrypted information received and processed by the unit includes a code which is unique to that unit whereby only that unit may extract the communication encryption key and wherein the unit is operable using the key for use in direct mode operation for a cumulative time up to a pre-determined finite time of service.
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Accused Products
Abstract
A radio transceiver unit for use in a radio communications system and operable in a direct mode of operation (DMO), the radio transceiver unit comprising:
means for receiving encrypted information including a communication encryption key for use in direct mode communications;
means for processing the received encrypted information to derive the encryption key included therein; and
means for conducting encrypted direct mode operation using the communication encryption key.
A system including a processor and a method of operating the system to provide the encrypted information to enable a user to undertake secure DMO communications is also disclosed.
14 Citations
19 Claims
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1. A radio transceiver unit for use in a radio communications system and operable in a direct mode, the radio transceiver unit comprising:
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means for receiving encrypted information including a communication encryption key for use in direct mode operation (DMO) communications;
means for processing the received encrypted information to derive the encryption key included therein; and
means for conducting encrypted direct mode operation using the communication encryption key, wherein the encrypted information received and processed by the unit includes a code which is unique to that unit whereby only that unit may extract the communication encryption key and wherein the unit is operable using the key for use in direct mode operation for a cumulative time up to a pre-determined finite time of service. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification