| Summary: | 碩士 === 朝陽科技大學 === 資訊管理系碩士班 === 95 === In Mobile Ad Hoc Networks (MANETs), every node is a distributed wireless mobile forwarding node with limited transmission range. MANET is a self-organized network rather than a fixed network topology. As a result, the issue of supporting a secure authentication management in MANET is more difficult and complicated than that in a fixed wired network because MANET lacks a fixed certificate authentication (CA) server. Moreover, multicasting in MANET is an important application for a sender to send some real-time resources or critical data packets to multiple receivers through the least cost multicast tree. How to provide a secure CA for mobile nodes operating in a fully distributed multicast MANET becomes more and more troublesome. Therefore, in this work we propose a two-step secure authentication mechanism for distributed multicasting in MANET. The proposed approach consists of two main functions. First, we adopt the Markov chain analysis to determine an update-to-date trust value (TV) for all 1-hop neighbor nodes based on previous manner performance of each node in individual multicast group. Second, the mobile node with the highest TV in a group will be selected as the CA server and the second one will be selected as the backup CA server for taking over the CA when the CA server leaves the group or becomes failure. Consequently, the proposed approach achieves a secure reliable authentication in multicast MANET. Numerical results demonstrate the analysis results of TV of each mobile node under different performance situations are the same as that of simulation. That means the Markov chain analysis can accurately analyze the trust value of each member node within the same multicast group.
Keywords —MANET, Markov chain analysis, key management, trust, secure authentication, fully distributed
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