Securing Fisheye State Routing Algorithm Against Data Packet Dropping by Malicious Nodes in MANET.

Mobile Ad Hoc Network (MANET) is an emerging area of research in the communication network world. As the MANET is infrastructure less, it is having dynamic nature of arbitrary network topology. So, it needs set of new networking strategies to be implemented in order to provide efficient end to end communication. These (MANET) networks have immense application in various fields like disaster management, sensor networks, battle field etc. Many routing protocols have been proposed in MANET among which Fisheye State Routing (FSR) protocol scales well in large network. Security in MANET is a very difficult problem to incorporate without degrading the performance of the protocol. A performance comparison of different routing protocols has been given here and this research narrows down to security related issues associated with FSR. The attacks on the MANET can be broadly divided into 2 types as active attacks and passive attacks. The proposed scheme deals with minimizing passive attacks which causes dropping of data packets by the selfish nodes or malicious nodes. The idea is based on modifying the traditional Dijkstra’s Algorithm which computes shortest route to all destinations from a source. The actual FSR algorithm considers the link cost between two nodes as 1 if one node comes in the radio range of another. In our proposed scheme the weight has been assigned depending upon the number of times the next node has behaved maliciously or selfishly. Here we have proposed one scheme which uses a two hop time stamp method to detect a malicious node and the Dijkstra’s shortest path algorithm has been modified to re compute the optimal paths to destination and hence, to minimize the data packet dropping by malicious nodes in the network