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Cognitive radio (CR) is an intelligent radio, which is been targeted to exploit the utmost available spectrum holes for unlicensed users by sensing the environment. The arrival of advanced wireless communication devices lead to increase in the demand on the spectrum and the need to improve utilization of vacant spectrum. In the past decade the spectrum sensing and allocation has been the main focus of research rather than the security in cognitive radio. A selfish cognitive radio node is a serious security issue which occupies a part of the resources or full resource which is generally a pre-occupation problem in the multiple channel, and forbids other legitimate cognitive nodes from consuming the resources. This self-centered cognitive radio can critically degrade the performance of the network. So a skillful resource allocation strategy should be adopted to avoid these selfish attacks in the network. The …