Wireless networks technologies have been dramatically improved by the popularity of third generation (3G) wireless networks, wireless LANs, Bluetooth, and sensor networks. However, security is a major concern for wide deployments of such wireless networks. The contributions to this volume identify various vulnerabilities in the physical layer, the MAC layer, the IP layer, the transport layer, and the application layer, and discuss ways to strengthen security mechanisms and services in all these layers. The topics covered in this book include intrusion detection, secure PHY/MAC/routing protocols, attacks and prevention, immunization, key management, secure group communications/multicast, secure location services, monitoring and surveillance, anonymity, privacy, trust establishment/management, redundancy and security, and dependable wireless networking.