The Security Routing Protocol Based On Local Reputation Mechanism In Mobile Ad Hoc Network

Mobile Ad Hoc Network is a special peer-to-peer network which is self-governed, infrastructureless, and dynamically reconfiguration,and it is very vulnerable to a wide variety of attacks. In mobile ad hoc networks,nodes cooperate by forwarding packets for each other to allow them to communicate beyond direct wireless transmission range.Therefor,the cooperation of nodes is a key issue to communication. The cooperative security schemes offer the reasonable effective solution to resolve the uncooprative behavior which launched by the malicious and selfish nodes in the inner mobile ad hoc networks.This paper mainly discusses how to inspirit nodes to cooperate under the condition which lack of a prior trust relationship.This paper surveys the typical routing protocol of Mobile Ad Hoc Network firstly,and analysis the security issues in Mobile Ad Hoc Network,makes a comparison and discussion of their respective merits and faults.In the no-cooperation network, self-concern and malice conduce the nodes are not cooperate with others.We propose the noncooperation attack model and examine the effect of the model by simulate.Simulation results show that these noncooperation behavior can effect the network performance in a great degree.Then addresses the existing research on the cooperation schemes: virtual currency based schemes and reputation based schemes,and makes a comparison and discussion of their respective merits and faults.Base on the research,an Optimizational Local Reputation System is presented.The model fully consider the characteristic of mobile ad hoc networks,optimize the calculation of reputation,share the information between nodes by transmit locally.It has the characters of distribution,cooperation and facility. Finally,we propose a security routing protocol(OLRS-DSR).The security routing protocol is described and simulated. Simulation results show that it can detect the noncooperation nodes fleetly and give the appropriate punishment,and get better performance on throughput and packets delivery ratio.