Two Types of Attacks against  Cognitive Radio Network MAC Protocols
Some typical MAC protocols have been proposed for multi-hop CR network recently. In a multi-hop MAC protocol, a node uses the common control channel to perform channel negotiation before data transmission. Recent research findings indicate that insecure transmission of control channels open vulnerable holes for the Denial of Service attacks. This paper makes a security analysis for CR network MAC protocols. There are two types of attacks against CR network MAC protocols. Firstly, we study how denial of service (DoS) attack is launched in multi-hop CR network MAC protocols. Then, we explore MAC layer greedy behaviors in CR networks. Our analysis and simulations indicate that such attacks can greatly affect the performance of CR networks. And the key factors for attack efficiency are presented in this paper.