Patent ID: 8681989
Filing Date: 2014-03-25
Classification: H04L,H04W

Abstract:
1. A Wideband Code Division Multiple Access 3 rd Generation (WCDMA 3G) voice communication protection method, the method being performed by a terminal operating in conjunction with a Secure-Universal Subscriber Identity Module (S-USIM) for voice communication protection and configured to protect WCDMA 3G voice communication, comprising: when a calling terminal connects a voice communication channel to a called terminal, preparing for secure voice communication by collecting information about relevant voice communication; at the calling terminal, setting synchronous data by exchanging the voice communication information with the called terminal, and performing a secure synchronization procedure based on the set synchronous data; at each of S-USIMs that operate in conjunction with the calling and called terminals, generating a session key for secure voice communication based on the synchronous data, the session key configured to be kept in each of the S-USIMs during the WCDMA 3G voice communication; and performing secure communication by encrypting and transmitting voice-coded data to be transmitted based on the session key, and decrypting and reproducing received voice-coded data based on the session key, wherein the secure synchronization procedure includes replacing the voice-coded data with the synchronous data and synchronous establishment data for establishing timing synchronization and exchanging a result of the replacement between the calling terminal and the called terminal.