Research On Trust Model In Ad Hoc Network

Ad hoc network is a multihop, temporary and autonomic system comprised of a set of mobile terminals with wireless transceivers. The characteristics of Ad hoc networks are different from traditional wireless networks, such as non-center and self-organized. Then the behaviors of nodes in the network are more difficult to control. And the establishment of trust relationship is particularly important. This paper focuses on the trust model for Ad hoc network.On the basis of the research of the existing models, a trust model based on entropy theory is proposed. In this model, the trust relationship between nodes is quantified by trust value. The direct trust value is obtained by node's direct observation, and the recommending trust values are stored in target node locally by using the aggregate signature, and the recommending trust values are obtained by direct request to the target node whether the target node is online or not. Thus, the overall trust value after is more credible. However, the model still exists some security flaws. To solve this problem, a trust model based on trusted computing is proposed. Nodes authenticate each other through direct anonymous attestation certificate issued by off-line CA, and then the contents of platform configuration register and the stored measurement log are used to confirm the current status and integrity of node's platform which ensures the trust of the platform, and eliminates the security risk brought by damage of platform integrity. Finally, the two models are summarized, and future research directions are pointed out.