Research On Secure Routing Protocols In Mobile Ad Hoc Networks

Mobile ad hoc network (MANET) is a multi-hop temporary autonomous system of mobile nodes equipped with wireless transceivers and receivers. As it doesn't depend on fixed network infrastructure, have no central controlling node as well as be good in resisting destructions, it plays an important part in military and civil applications, Due to some of its characteristics such as the absence of fixed infrastructure, frequent changes in network topology, openness of wireless links, and finity of node and network resource, MANETS routing protocols are vulnerable to many types of attacks, such as DoS, modification, impersonation, fabrication and selfishness etc. So secure routing in MANETs is much more important.Firstly, we introduce the basic theory of the mobile Ad hoc networks, routing protocols and its sort, especially analyse the work mechanism of our main research object—AODV routing protocol. Then we analyse the secure chanllenge and target of the MANET, especially study the security threaten of the MANET routing protocol, summarize the research actuality of the two main secure routing strategy, and also compare their own respective strongpoint and deficiency.Aiming at the routing protocol's impersonation, fabrication, modification and DoS attack of the exterior malicious node, we put forward a secure and efficient routing scheme based on ECC, Self-certified pubic key, One-way hash chain and Hash-tree. This scheme doesn't need certificate, the user produce the private key itself, so there is no secure distribution problem of the user private kdy, and use the subsection reverse-used hash tree chain to protect the sequence and hop count contemporary, which can prevent from the "same distance fabricate"attack efficiently.Aiming at the selfish behavior problem of the inside node in MANET, we put forward a trust-based secure routing TBAODV. Firstly we analyse the advantage and deficiency of the Bayesian-based trust evaluation in estimating the turst of the node's packet transmitting behavior, and improve it, then we put forward a trust evaluating model and secure routing frame based on the Bayesian method, and realize a secure routing scheme based on the AODV protocol.At last, by modifying and extending the AODV protocol of the NS2 simulator, we complete the simulation experiment and result analyse to prove the validity of the proposed schemes.