Cross-Layer Design is useful for wireless communication to improve the performance and efficiency. On the other hand, Cross-Layer Design is also helpful in enhancing network security. With the help of cross-layer information and interactions, the security overhead can be reduced and the security efficiency can be improved. In this chapter, the authors review the existing literature and provide a taxonomy based on their methods and applications. According to their survey, these cross-layer security enhancements could be classified into four categories: 1) security protocol; 2) security policy; 3) key management; 4) intrusion detection. The authors hope to attract more applications and research attention in this direction.
