The Research Of Authentication Model For Wireless Ad Hoc Network

Wireless Ad hoc network is a kind of network which consists of wireless, mobile and self-organize nodes,it doesn't depend on existing infrastructure,nodes communicate with each other by multiple-hop link between them.As its characteristics,Ad hoc network brings us fresh application modes and at the same time,brings us challenges on building secure and credible networks.Authentication is the first step for building secure and credible networks,in traditional networks it is implemented with CA(certificate authority) and Authentication protocol. Nevertheless,because Ad hoc network is centraless and self-organized network, characteristics of it should be taken into account while designing an authentication model for Ad hoc network.Combining the characteristics of Ad hoc network,a kind of self-organize and on-demand authentication model is proposed in this dissertation.In the model, network is abstracted to directed certificate graph and trust relationship is abstracted to path relationship among nodes,authentication is accomplished by transferring trust between nodes.The model allows users to create,store,issue and revoke certificate without any centralized server,nodes request certificates on demand,it will avoid periodic broadcast exchange so that reduce consume in resource.As to renovate and revoke certificate,a revocation strategy which is adapted for on-demand authentication model is proposed in the dissertation. Contrasted to traditional strategy,the strategy improves revocation efficiency by using partial nodes in network.Message format is defined in implement model, simulations results from Ns-2 show that this self-organize and on-demand authentication model has good performance for Ad hoc network.