Mobile Ad-hoc networks are exposed to various security threats because all traffics are carried in air and there is no central management authority. For the sake of secure communication in an Ad-hoc network, a scheme is inevitable to securely distribute security keys in the network. Based on the cluster structure and the verifiable secret sharing scheme[1], this paper proposes a pairwise key agreement scheme which is secure and induces a lower overhead. The proposed scheme is safe against a man-in-the-middle attack while not all private keys within the destinations cluster are exposed. In addition, our simulation result shows that the proposed scheme is more efficient and scalable than CABM(Clusterhead Authentication Based Method)[2].
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