Research On Secure Cooperative Spectrum Sensing Based On Reputation Mechanism In Cognitive Radio Networks

Along with the rapid development of wireless communication technology and the popularization of wireless communication products, the problem of shortage of spectrum resources has become increasingly prominent. The emergence of cognitive radio networks has alleviated this problem. Cooperative spectrum sensing often used in cognitive radio networks improves the accuracy of spectrum detection. However, its security is urgent to be solved.Secure cooperative spectrum sensing strategy based on reputation mechanism proposed in this paper against spectrum sensing data falsification (SSDF) attack, collusion attack and selfish nodes. By improving the enthusiasm of secondary user to cooperative sensing, the strategies guarantee the safety and accuracy of spectrum sensing decision results. The main contributions of this paper include:(1) Against the successional and discontinuous SSDF attacks launched by the single malicious secondary user and some malicious secondary users, respectively, we proposed a reputation model for cooperative spectrum sensing. Simulation results show that the proposed model can effectively identify the malicious secondary users and defend against the SSDF attacks. In addition, it can improve fault-tolerant ability, and reduce the probabilities of false alarm detection and missing detection.(2) There may exists malicious secondary users those raise the reputation value recommended each other in cooperative spectrum sensing to hold more weight in the fusion of the sensing results causing the inaccurate decision. Through analyzing the collusive behavior, the strategy of using VCG mechanism incents secondary users to provide real reputation value recommended and calculates the reliability of cooperative users though the reputation mechanism. The simulation results indicate that the proposed strategy can effectively defend against the collusion attacks, achieve security cooperation and improve the accuracy of spectrum sensing.(3) A secure cooperative spectrum sensing strategy based on the reputation value transfer and the dynamic game is proposed to against selfish nodes. The reputation value is the important parameter for dynamic game's payoff. We design a dynamic game model based on reputation and proof the Nash equilibrium, cooperative spectrum sensing. Simulation experiments and real test platform results show that the proposed strategy accelerate the reputation value of cooperative secondary users to be assessed and ensures the secondary users with high reputation value can access to high-yield to resist the security threats caused by selfish nodes, so as to ensure the accuracy of spectrum sensing.