Patent ID: 6081600
Filing Date: 2000-06-27
Classification: H04B,H04K,H04W

Abstract:
A communication unit for use in a wireless communication system, the communication unit comprising:a traffic data key generator for generating a traffic cipher key stream;a traffic data encryptor coupled to the traffic key generator for encrypting traffic data with the traffic key stream;a signaling processor which produces signaling data, the signaling data being destined for a signal destination node of the wireless communication system;a signaling key generator which generates a signaling cipher key stream from a number stored on a subscriber information module (SIM);a signaling encryptor, coupled to the signaling processor and to the signaling key generator, which encrypts the signaling data using the signaling cipher key stream resulting in encrypted signaling data;a traffic data source which produces said traffic data, said traffic data being destined for a traffic destination node of the wireless communication system;a multiplexor coupled to the traffic data encryptor and the signaling encryptor for multiplexing the encrypted traffic data and encrypted signaling data;a transceiver, for transmitting the multiplexed encrypted signaling data and encrypted traffic data over a first RF link to a node of the wireless communication system.