The Research Of WSNs Security Mechanism Based-on Trust

With the ability increased in all aspects of sensor nodes, the supporting technologies of WSNs are gradually mature, and the application background of WSNs rapidly expands. So the demand on safety and reliability of WSNs is growing. In WSNs, the security system which is Password-based, it doesnot has effctive method for responding to the attacks from inside of networks and identifying the malicious node. AS an important complement to this system, the security mechanism based-on trust was come up. Trust management has a significant advantage in solving internal attacks in wireless sensor networks, identifying malicious nodes, selfish nodes, and nodes with low competitiveness, improve system security, reliability and fairness. The paper mainly studies trust management of WSNs with the support of National Natural Science Foundation about security mechanism based-on trust. This paper is based on many articles published higher quality EI international conference and journal papers to finish. It include: evaluate and calculate the trust degree of nodes, the data fusion based trust and secure routing based trust. Research results summarized as follows:(1) The paper discusses how to calculate nodal trust value in detail, and then evaluation based single behavior and long-term behavior are proposed. In this paper, the one based single behavior successively used ANP method and F-ANP method, and then compare them. Because of that the F-ANP method used the triangular fuzzy number to replace the statty degree, and then it can effectively solve the subjective freedom of ANP, finally, it has a result, the F-ANP is better;(2) Based on the above , the sliding window model is proposed in the long-term, at the same time, the content of window is updated by the window operation, and to realize the evaluation mechanism which trust the dynamic update and calculation.(3) Based on the paper proposed trust evaluation mechanism, data fusion technology based on trust is sudied, in this part, the algorithm of data fusion which can reduce energy consumption and based on the relay node, trust and clustering. At the same time in the energy consumption are analyzed and proofed, demonstrated its superiority.(4) Secure routing based trust is proposed, in this part, the trust degree is joined to the directed diffusion routing protocol, and use trust replace gradient, make it become a kind of have security features and high load balancing routing protocol, simulation results show that the improved scheme is better than original. At the same time and several other based on trust routing protocol is used in the comparison.