Security Issues of Cognitive Radio Network

Security is a critical issue in Cognitive Radio Networks CRN. And in order to implement appropriate security mechanisms, various possible attacks on (CRN) must be identified. This paper clarifies a literature review of different CRN surveys, security features of CRN, attacks on CRN and lastly attacks and their corresponding countermeasures are tabulated in order to identify researchers about the last updates in CRN's attacks and countermeasures.