Zeynab Sadat Seyed Marvasti - Department of Computer Engineering, Islamic Azad University, Yazd ،Iran
Omid Abedi - Department of Computer Engineering, Shahid Bahonar University of Kerman, Iran

The cognitive radio network (CRNs) has been developed in recent years for the optimal use of Available vacuum in the frequency spectrum. In this network, Cooperate Spectrum Sensing (CSS) is used to combine the observations of all users. In CRNs, security is one of the most important problems. spectrum sensing data falsification (SSDF) attack is one of major challenges for CSS in CRNs, in which Malicious user are among honest users trying to change the information sent to the fusion center and thus make the fusion center s wrong decision. In this paper, a method for defense against SSDF attack is proposed using MLP -based neural network. In this scheme, the weights of secondary users were constantly updated and finally the sensing results were combined in the fusion center based on their trusted weights. Simulation results show that the proposed scheme can significantly reduce the effects of Spectrum Sensing Data Falsification (SSDF) attack even percentage of malicious users are more than trusted users.

Cognitive Radio, MLP, Malicious User, SSDF Attack