Hierarchical based group key transfer for secure group communication

In this research paper, a scalable and efficient multicast secure protocol for large and dynamic systems that relies on trusted Key Generation Center (KGC) is proposed. In this protocol, we partition the entire group into several subgroups which is controlled by Intermediate Controller (IC). Our protocol is based on Iolus protocol and the hierarchical structure of LKH protocol. The decomposition of subgroup is organized in an hierarchical manner as it is in the LKH protocol which helps us to reduce the complexity for a member to join or leave from O(n) to O(log m), where n represents the number of entire group members and m represents the number of each subgroup members. Out protocol performance is compared with that of Iolus and LKH protocol. The performance is enhanced especially when there is a member leave operation.