Openly available communication signals, in wireless adhoc network poses high security risk. The adhoc networks are very much vulnerable to Dos attacks on the network layer. Blackhole and Grayhole attacks are the widespread attacks on adhoc networks. Here the malicious nodes interrupt data transmission in the network by transmitting false routing information. A realization of these enabled us to approach the subject of data security in wireless adhoc networks with a different perspective so as to have a communication route, free from all previously mentioned security threats. The purpose of this paper is to present an efficient Adhoc On-demand Distance Vector (AODV) protocol that removes the malicious node by isolating it, thereby ensuring secure communication. In order to achieve this goal, the intermediate nodes receiving false routing information from its neighbour node is programmed to consider that neighbour node as malicious. In adhoc network, nodes can join or leave at any time. So, an efficient security mechanism is needed. So, the nodes are arranged in spanning tree fashion. An RSA key exchange and two encryption techniques are used among authenticated neighbours in the adhoc network to provide more security and thus avoid group rekeying problems.
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