SECURITY METHOD FOR BROADCASTING SERVICE IN MOBILE COMMUNICATION SYSTEM, ESPECIALLY REGARDING TO SUPPLYING A BROADCASTING SERVICE TO A MOBILE STATION

摘要

PURPOSE: A security method for a broadcasting service in a mobile communication system is provided to generate an encryption key for a broadcasting service with a masked random seed and a random seed obtained with a mask value, thereby performing more thorough security function for receiving the broadcasting service. CONSTITUTION: When a BAK(Broadcast Access Key) is transmitted(31), a random seed is generated(32). An SK(Short-time encryption Key) is generated by using the BAK and the random seed(33). A base station creates crypto-synchronization information by using a time stamp value(35,36) when a broadcast security packet is to be generated, and creates an encryption mask by performing AES(Advanced Encryption Standard) algorithm with the crypto-synchronization information(34). The broadcast security packet is created by performing an XOR process for the encryption mask(37,38,39).