Security Methods to Mitigate Different Attacks in Mobile Cognitive Radio Networks

In cognitive radio networks (CRNs), dynamic spectrum gain is provided in which secondary users (SUs) can utilize the licensed spectrum bands based on the opportunistic non-interference. The operation of such networks is based on efficient cooperation between the SUs for the spectrum sensing. Due to the open nature of such mobile CRNs leads to the possibility of various security threats. In networks like mobile CRNs, the security threat called SSDF (Spectrum Sensing Data Falsification) in which malicious secondary users (SUs) altering the sensing information to adjacent to deceive and compromise spectrum sharing in CRN. This attack spread fake information among the SUs to lead the inaccurate selections about the PU activity. This attack was prevented by some recent studies, but another attack called Insistent SSDF (ISSDF) is introduced in CRN. ISSDF targeted the Distributed cooperative spectrum sensing (DCSS) methods in which attacker altering its sensing data as well as broadcasting the altering value of DCSS schemes at each iteration and reject from modifying its value according to the iterative protocol. The security threats like SSDF and ISSDF are harmful to CRAHNs. In this paper, we present the different methods to mitigate the security attacks in CRNs. The outcome of this paper is the current solutions and their problems.