The Research And Simulation Of Trust Mechanism Of WSNs Nodes Based On Evolutionary Game

With the application and development of wireless sensor networks, there is a growth tendency to concern about security issues of it by researchers. In recent years, in addition to traditional security field, people began to look toward trust management problems of WSNs.WSNs transmit data packets mainly through the way of mutual nodes forwarding. Due to limitations of energy and resources of WSNs nodes themselves, when completing tasks with other nodes, they will fall into a state that refuses to cooperate with others in order to reduce energy consumption. While some normal nodes are easy to be used to help malicious nodes forward the packet. Trust management requires building trust mechanisms between the nodes, which ensures mutual trust and cooperation between normal nodes and refuses to cooperate with distrustful malicious nodes.For each node, the choice of trust and helping other nodes forward data packets can enhance credibility and result in a gain. Meanwhile it will pay the costs, such as energy consumption, the risk of malicious information. However, for selfish considerations, the nodes are often reluctant to help other nodes in forwarding data packets. Thus they choose distrust and refuse to cooperate, which will affect the credibility of the nodes and result in lower earnings. Aimed at this contradiction relation in this paper, the entire WSNs reach the evolutionary stable strategy through building evolutionary trust model by evolutionary game. The vast majority or even all of the nodes choose WSNs trust policy in this condition. Specifically, the main research contents of this paper are as follows: 1. It is a brief analysis of the limiting factor of the wireless sensor network security and trust, elaborating the contradictions of WSNs node trust and cooperation combined with game theory. It proposes the background, significance and the main content of the issue.2. Based on evolutionary game, building evolutionary trust model of WSNs according to the characteristics of not complete rationality of WSNs nodes. It proposes two different dynamic selection method of reflection and imitation. The theorems of reaching the evolutionary stable strategy are derived through the dynamics analysis and verified by simulation experiment.3. It is introduced incentives, packet loss rate and packet loss retransmission mechanism in evolutionary trust model, and analyzes the degree of motivation and packet loss impacting on WSNs trust and cooperation and verified by simulation experiment.It pays increasingly attention to game theory researching on wireless sensor networks in trust management problems. It researches on WSNs node trust and cooperation based on evolutionary game in this paper, reveals law of dynamics of evolutionary trust of WSNs nodes and provides theoretical foundations for WSNs trust management.