Abstract

In secure group communication for applications such as pay-per-view, teleconferencing, and video conferencing, key management method with logarithmic computation is expected along with storage and bandwidth efficiency. Major aspects with key management are formation of group key with initial group members and updating the group key with any change in number of group members. Rekeying is mandatory due to group join/leave operations or periodic rekeying. Logical Key Hierarchy has logarithmic rekeying cost. This paper explores Logical Key Hierarchy (LKH), LKH variants with centralized and distributed approach are analyzed and presented. This paper explores their way of achieving and persisting logarithmic cost for secure group communication, to decide the suitable method for a current application.

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