An Enhancement towards the Security of Aodv Routing Protocol in Manet

Mobile Ad-hoc Network (MANET) is an infrastructure less network of mobile nodes. Because of the increased number of budget friendly, modest and more powerful devices MANET became a fastest growing network. As it does not have a centralized administration mechanism and the network is open shared medium any node can enter or leave the network at any time. This is the main vulnerability in MANET which leads to many security attacks. The previous approaches for the security of MANET couldn't completely prevent the problem. Many researchers had developed many algorithms, but none of them made a decent trade off between the security and performance. In this paper, we enhance the AODV protocol to minimize the attacks and hence the error packets. The proposed method uses NMAC(nested message authentication code) along with the sequence number of the node to minimize the attacks. In this method we detect sinkhole attack and minimize the rate of error packets by observing the highest sequence number. This paper shows performance metrics as the average packets sent, packets lost and the overall error rate. Keywords— Nested Message Authentication Code; Hop Count Based Key Selection; Sinkhole attack Introduction.