Research On Secure Routing For Mobile Ad Hoc Networks

Mobile Ad Hoc network(MANET)is a dynamic and easily reconfigurable wireless network without fixed infrastructure,which includes the characteristics of self-organizing,multi hop routing,no center,dynamic topology etc.Therefore,it is mainly applied to such scenes as battlefields and emergency meetings.However,the Ad Hoc routing protocol had not fully been considered about the security mechanism at the beginning of the design,and partial security protocols proposed later still suffer from single defense attack,which results that the Ad Hoc network is vulnerable to various kind of attacks.And the most vulnerable attacks include data packet discarding,black hole attack,replay attack,route spoofing attack,routing forgery attack etc.In order to ensure the communication security of Ad Hoc network,it is necessary to adopt secure routing.The existing security routing is divided into two main categories,the first kind of secure routing is based on trust model,which collects evidences from the network and obtain evaluation-based trust values by evaluating trust.The second kind of secure routing is based on cryptographic,which adopt such mechanisms as encryption,authentication,secret key negotiation to guarantee the security of routing.Firstly,focus on data packet discarding attack,black hole attack and route spoofing attack,based on trust model we propose an Ad Hoc secure routing through reference node policy.And the trust evaluation model is divided into direct trust evaluation and indirect trust evaluation.Direct trust evaluation use message statistics strategy to estimate attack nodes of partial data message discarded.Indirect trust evaluation use hand reporting mechanism to estimate attack nodes of complete data message discarded.At the same time,based on trust model also propose using reference node policy to detect malicious nodes of black hole attacking,and by establishing RREQ routing trust routing and RREP reply trust routing achieve the goal of establishing secure communication link.Furthermore,NS2 simulation results illustrate that the proposed secure routing can effectively defend against attack nodes and improve the security of network.Secondly,focus on replay attack,route forgery attack and data packet dropping attack,we further propose AODV secure routing based on identity authentication.And the technology we proposed first through the trust model,dectting attack nodes of partial data message discarded and selecting the authentication center node.Then,utilizing time stamp in the identity authentication model to defend against replay attacks.Finally,using the hash key chain to simplify the secret key management and authentication processes defend against the route forgery attack.Specially,our simulation results illustrate that the techenology we proposed can remarkably improve the effectiveness of AODV secure routing.In conclusion,researching on Ad Hoc network secure routing and designing secure routing protocol based on trust model and cryptographic can great defend against various kind of attacks and guarantee the routing security of Ad Hoc network.