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Secure and reliable group communication is an increasingly active research area by growing popularity in group-oriented and collab- orative application. One of the important challenges is to design secure and e-cient group key management. While centralized management is often appropriate for key distribution in large multicast-style groups, many collaborative group settings require distributed key agreement. The communication and computation cost is one of important factors in the group key management for Dynamic Peer Group. In this paper, we ex- tend TGDH (Tree-based Group Di-e-Hellman) protocol to improve the computational e-ciency by utilizing pairing-based cryptography. The re- sulting protocol reduces computational cost of TGDH protocol without degrading the communication complexity.

An Efficient Tree-Based Group Key Agreement Using Bilinear Map