Energy Optimized And Security Routingalgorithm In Wireless Sensor Network

With the development of information technology and increasing demand of networkapplications, Wireless sensor network, which has the ability of monitoring environment, hasbecome the focus research field and widely used in various fields such as industrial production,environmental monitoring, intelligent building, medical care and military. As WSN has thecharacteristics of channel open, resource constraints and distributed topology, the energyconsumption and security become the important issues of restricting the development of WSN.This thesis proposes an energy optimized routing algorithm based on WSN security tosolve the problems of network lifetime and network normal function brought by energyefficiency, energy consumption imbalance and security threats.This thesis analyzes the condition of security attacks in WSN and raises a trust evaluationmechanism applied in WSN according to the characteristics of WSN. The mechanism assessesthe deliver behavior of sensor nodes and establishes the efficient trust evaluation model easilyimplemented in WSN on the basis of nodes subjective assessments and other nodesrecommendation of trust value.On the basis of the concept of potential field in physics, the thesis builds up four potentialfields using the information of node depth, node residual energy, region energy and securitytrust value, then unifies them to an integrated potential field which is used to determine therouting to achieve the optimization of energy efficiency, energy balance and network security.Finally, comparison simulations on the platform of Matlab verify the performance ofalgorithm and security mechanism. The simulations show that the new algorithm could makerouting to avoid the nodes with low energy and low security in low energy region. Thealgorithm can make data packets transmission through the node with high energy and highsecurity in the high energy region and prolong network lifetime, make the energy consumptionbalance, raise the network throughput ratio and network security. Then the thesis makes asummarization and prospects the future of research.