An Authenticated Transitive-Closure Scheme for Secure Group Communication in MANETS

It is essential to provide authentication on mobile nodes in group communication to ensure security and privacy. The nodes that are interested in participating in the group communication form Graphs (V, E). In this paper we authenticate the mobile nodes through transitive closure property of the graph in the routing phase of the On Demand Multicast Routing Protocol (ODMRP) that forms Transitive closure graph. We also performed collaborative group key generation with the nodes defined in the transitive closure graph to accomplish secure communication among the group members. Due to the dynamic nature of nodes in the group, we propose the join and leave algorithm. The rekeying is performed at every change that happens in the (Transitive Closure Graph) TCG. The performance analysis is done by simulation with various protocols with respect to the time taken to joining or leaving the group, time taken for group key generation, rekeying the nodes with respect to renewal of nodes in the group. The proposed system shows our protocol reduces the computational and communicational cost of secure group communication.