The Research Of Mobile Ad Hoc Networks Trust Model

A mobile ad hoc network is a multihop, temporary and autonomic system comprised of a set of mobile terminals with wireless transceivers. It has characteristics that different from traditional wireless networks, such as non-center and self-organized. Thus Mobile Ad Hoc Networks can be widely applied in military and civil environment. However, Mobile Ad Hoc Networks are facing more security threats than traditional networks, especially the security problem of the routing. Because that the establishment of trust relation is the basis to implement all the security policies, this dissertation focus on the trust model for Mobile Ad Hoc networks.This dissertation discusses the security threats that Mobile Ad Hoc Networks faced and the concept and characteristics of trust. Besides, the dissertation gives an introduction and thorough research of the identity trust and behavior trust models for Mobile Ad Hoc Networks. Through comparison we find that there are many problems that can not be solved through traditional security policies, such as the establishment and revocation of identity trust relationship lack of decision standard and unable to guarantee secure ad hoc routing. In order to solve these problems, this dissertation integrates the trust evaluation mechanism to the identity trust model based on PKI, which will realize the identity trusted and behavior trusted among the network nodes. The model we improved uses behavior trust as the decision standard for updating and revocation of identity trust relationship. The model changes the CA nodes set dynamically through the behavior trust for better considering both the usability and security. Finally, we analyze and evaluate the security and usability of the improved trust model and take a prospect for its research future.