Indian Journal of Science and Technology

Abstract

Objectives: Dynamic spectrum access is the promising feature of Cognitive Radio (CR). When Spectrum sensing is executed in a cooperative manner, shadowing and fading get reduced. Therefore, it gives an invitation to security threats. Methods/Statistical Analysis: This paper elaborates various security hazards in cognitive radio networks (CRN) along with their countermeasures. The paper elucidates the complication of Spectrum Sensing Data Falsification (SSDF) attack. The Primary objective of SSDF attack is to devastate the judgement of Fusion Centre (FC). With the aim to mitigate the influence of adversaries on the judgement given by FC, this paper proposes a scheme based on reputation and trust of cognitive users. Findings: Proposed scheme works on a well-defined strategy that will annihilate the impact of malicious users. In this FC doesn’t possess any knowledge about the number of adversaries and strategy of attack. In order to minimize the influence of adversary, implementation of clusters is considered to be a good idea. Cluster formation takes place according to specified criteria. Encryption on the sensing reports of valid clusters is exercised, with the aim to prevent from attacks such as eavesdropping etc. Parameters such as false positive rate and true detection rate can use to judge the performance of the proposed scheme. Applications/Improvements: SSDF attack is the most dangerous attack and proposed scheme not only mitigates the effect of SSDF attack but also stands strong against other dangerous attacks such as eavesdropping attack.

Keywords: Cognitive Radio (CR), Cooperative Spectrum Sensing, Reputation, Sensing Data Falsification (SSDF), Spectrum