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As practical use degree of multicasting increase, security for multicast is recognized as an important issue. Previous research in the area of secure multicast has mainly focused on group key management. The most important thing about the security of multicast is that only authorized members of this group will be able to access the data. The member of access to multicast communication is to use cryptography with a common shared session encryption key. We propose decentralized group key management based on agent for dynamic multicast with large groups and frequent joins or leaves in this paper. Whole group divide to several subgroup using agent technology and each agent manage members of each subgroup. Also, when rekeying updates that using one-way hash function can prevent the key exposure, and reduce the key distribution delay. Key Words : Group-Key, Multicast, Security, Agent *  : (kdwon2002@ssu.ac.kr) 10 10 25  (1 10 12 03, 2 11 01 01)  11 01 13

A Study on Secure Group Key Management Based on Agent for Multicast Data Transmission