A Cluster-Based Key Management Scheme for MANET

Based on the characteristic of MANET, this paper designed an Id-based and hierarchical group key management scheme on large-scale MANET. Our group key distribution is different from traditional scheme, its secret shadows are not brought from group controller, but from each sub-group center node´s private key signature, by getting together all these n secret shadows, the GC can construct polynomial, any of sub-group center node can request these secret shadows from t of its neighbor nodes. When node was roaming from one sub-group to another, we would use delay rekeying policy to decrease the cost of these two sub-group center nodes. By analyzing, our scheme is more secure, efficient, expansive and fault- tolerant.