Research On WSN Secure Routing Protocol Based On Geographical Location

Wireless sensor network is a network formed by a large number of sensor nodes through self-organization,and has widely application prospect.As the wireless sensor network is usually deployed in harsh and unattended environment,and its own vulnerability,the network is vulnerable to attack and interference,so it is necessary to study the safety problems of WSN,to improve the haleness and robustness of the network.The secure routing technology is one of the key technologies of WSN security.At present,many WSN routing protocols have been proposed.Most of the designs are based on the premise of saving energy,but lacking of consideration of security issues.Therefore,ST-GEAR(Security Trust Geographical and Energy Aware Routing)is designed,which is based on the existing wireless sensor network routing protocol.It is a combination of a secure boot model based on regular hexagonal mesh deployment and a security trust mechanism BDRM.The results are as follows:First of all,we select the trust mechanism for in-depth study while analyzing the attack modes the routing protocols are vulnerable to suffering,as well as the defense methods against various attacks.Considering the problems of the trust value calculation complexly and large energy consumption of the nodes in trust mechanism,we propose a Binomial Distribution Reputation Mechanism(BDRM)based on Beta distribution.The trust value of the node is calculated by the energy of the node and the communication behavior of the node.A malicious node is identified based on the trust value of the node.And BDRM can protect the routing protocol from internal attacks.Secondly,in view of GEAR routing protocol in the security defense deficiencies,in order to improve the security of GEAR routing protocol,a secure routing protocol ST-GEAR is designed.The ST-GEAR protocol has better defense attack capability by introducing the security boot model and security trust mechanism BDRM into the route.Among them,the security boot model can guarantee the integrity of the information transmitted between nodes.The security trust mechanism BDRM can calculate the trust value of nodes.The trust value of the node can help us evaluate the node.Through evaluation,we can find malicious nodes in the network.At the same time,the node selects the node with low comprehensive cost as the next-hop forwarding node,and excludes the malicious nodes,and improves the security of the routing protocol by considering the energy,distance and trust value.Finally,using Matlab to simulate the secure routing protocol ST-GEAR.The simulation results show that,the ST-GEAR security routing can improve packet transmission rate to a certain extent and reduce the packet loss rate,compared with the GEAR and E-GEAR routing protocols.