The Eavesdropping Attack on Security tradeoff for Cognitive Radio Networks

Cognitive Radio (CR) technology has been developed to overcome the scarcity of spectrum due to the rapid development of wireless networks. Spectrum is dynamically distributed in perceptual radio networks, thus increasing spectrum usage and increasing attacks, including eavesdropping. There are two types of eavesdropping attacks i) passive attacks that monitor transmissions and the second type ii) active attacks make modify the message. Data is protected from eavesdropping attacks in two ways. The primary user is protected from passive eavesdropping attacks by allowing only secondary users they know to use empty channels; However, any external user who does not know it is considered an attack, and they are not allowed to use the empty channel; The second method uses chaotic encryption where messages are encrypted before sending. Hence, the security of the cognitive radio network is one of the most focused and interesting topics. The results obtained in the first method by preventing unauthorized users from using the spectrum showed how the passive eavesdropping attack was prevented and the cognitive radio network protected. In the second method, the attack’s chaotic encryption appears as external noise and is sensitive to the direction of the initial changes. So the effectiveness of the encryption process and message protection is confirmed.