Research On Trusted Aodv (ad-hoc On-demand Distant Vector) In Wireless Ad-hoc Networks

A wireless Ad-hoc network is a kind of distributed wireless network in which each node communicates with others by multi-hops. Because of the nature of self-organization and the limit of individual resources, wireless ad-hoc networks can be compromised by malicious and selfish nodes. To reduce the harmful effects of malicious nodes in wireless ad-hoc networks, we propose a trust model which is based on wireless distant vector protocols. Our trust model is derived from subjective logic which specifies the trust presentation and manipulation. In our model, trust contains three elements, belief, disbelief and uncertainty.Our model is composed of in a monitor module, a routing module and a trust module. All these three modules function collaboratively. The responsibility of monitor module is to watch neighbor nodes'behaviors and calculate the neighbors direct trust value. The routing module is to deliver the route trust and maintain the route tables. And the main task of the trust module is to aggregate one neighbor's direct trust and the advertized route trust of that neighbor. Meanwhile the trust module provides trust metric for routing module. Based on this trust model, we design a new protocol called TAODV on top of AODV. We add the route trust field in the packet of route replay in order to reduce the overhead of trust broadcasting and propagation. Through simulation in NS2, we can see that the malicious nodes can be detected by TAODV and TAODV can guarantee the trustworthiness of the routing procedure of each node without introducing much overhead.