Patent ID: 6334185
Filing Date: 2001-12-25
Classification: H04L,H04W

Abstract:
A system for providing encryption of transmissions over an air interface between a mobile station and a plurality of nodes, comprising:a voice network switching node for communicating with the mobile station and a voice network, said voice network switching node including an algorithm for calculating an encryption key for encrypting transmissions between the plurality of nodes and the mobile station and a countersign in response to a random number;a packet data network switching node for communicating with the mobile station and a packet data network, said packet data network switching node requesting the encryption key for encrypting transmissions to the mobile station and a contersign from the voice network switching node and requesting the countersign from the mobile station, said request including the random number, said packet data network switching node further comparing the countersign from the voice network switching node and the countersign from the mobile station and providing encrypted communications between the mobile station and the packet data network switching node using the encryption key; anda backbone interface for interconnecting the voice network switching node and the packet data network switching node.