Ad Hoc Secure Routing Protocol Based On Trust Measurement

Ad Hoc network is comprised of a number of mobile devices, and can be quickly, dynamically and easily set up without fixed network infrastructure, and it has various applications in many fields, e.g. military facilities, mobile Ad Hoc meeting, medical care, and other aspects of daily life. But due to its intrinsic characteristics, Ad Hoc network is vulnerable to various malicious attacks. Thus, security is the key basement that Ad Hoc can be widely deployed, and routing security is fundamental to Ad Hoc network security.Apparently, recognizing and isolating malicious nodes will certainly enhance the security of Ad Hoc network. This paper takes advantage of trust measurement to recognize and segregate malicious nodes, introduces the idea of trust measurement to widely-acceptable routing protocol (i.e. AODV) to make up its secure routing design defects and proposes a secure routing protocol based on trust measurement (called as TAODV in short). Here, each node determines its neighbor's trust measurement according to the success probability of previous communications. Based on it, the paper also defines a route's trust measurement which is employed as a criterion to choose a route, and limit neighbor nodes'actions by their corresponding trust measurements. A node will be regarded as malicious when its trust measurement is below a previously-determined threshold. And by this way, those malicious nodes determined will be kept away during routing request and reply so that its malicious attack can be avoided. The paper discusses and analyzes the resistance ability of the proposed protocol when facing various familiar attacks and shows it is more secure and has better routing performances compared to previous secure routing.The paper also takes some simulating experiments. Here, use the network simulation tool NS2 to estimate performance of network transmission of TAODV under attacks. The experimental results show that compared to SAODV and ARAN protocols, TAODV has a higher Packet delivery Ratio, a smaller End-to-End Delay and network routing loads besides reducing the impact from malicious nodes.