This textbook offers a unique presentation of link layer security issues in wireless local area networks (WLANs), wireless personal area networks (WPANs), and wireless metropolitan area networks (WMANs). The book provides a state-of-art survey on link layer security issues in IEEE 802 wireless standards such as IEEE 802.11 WLAN, IEEE 802.15.1 Bluetooth, IEEE 802.15.3 UWB, IEEE 802.15.4 Sensor network, and IEEE 802.16 WMAN. The book will also be useful as a reference for researchers who wish to gain a greater understanding of wireless security without having to extract the information from the IEEE 802 standards themselves.