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Secure communication in Ad Hoc Network is crucial problem especially in battle fields or collaborative applications. An effective way securing communication is to encrypt all the messages exchanged among network users with a common key established by group key agreement protocols. Group key agreement protocols designed for wire networks are not directly used in wireless ad hoc networks because they are all based on broadcasting or one-hop distance assumption and however the ad hoc networks is dynamic and multi-hop distance. Clustering is an efficient method which splits the group members into clusters and arranges all the nodes in a hierarchical structure based on their relative proximity to one another.
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