Contributions to this volume identify various vulnerabilities in the physical layer, MAC layer, IP layer, transport layer and application layer, and discuss ways to strengthen security mechanisms and services in all layers. Topics covered in this book include intrusion detection, secure PHY / MAC / routing protocols, attacks and prevention, immunization, management, secure group communications / multicast, secure location services, monitoring and surveillance, anonymity, privacy, trust establishment / management, redundancy and security, and reliable wireless network.