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Key management is crucial part of security in communications. In wireless ad-hoc network, the issue is even bigger. As there is no infrastructure in the network, the distribution of encryption keys in an authenticated manner is a difficult task. Because of dynamic nature of MANETs, when a node leaves or joins it need to generate new session key to maintain forward and backward secrecy. In this paper, the authors divide the network into clusters. Cluster head will maintain the group key, it will also update the group key whenever there is a change in the membership. Here the re-keying process will be performed only if there is any movement of nodes within the clusters.
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