This book provides a concise survey of principles and state-of-the-art techniques for secure group communications (SGC) over data networks. It offers an overview of secure algorithms and protocols for group communication linking areas such as applied cryptography and computer networking. Also included is a coverage of challenges in deploying secure group communication-based applications over wireless networks. These challenges include the limited computational power of mobile devices, susceptibility of wireless networks to intrusion and unauthorized access and mobility of nodes in a wireless ad-hoc network environment. Secure Group Communications over Data Networks provides a wealth of information for network architects, IT Professionals, computer scientists, and advanced students of computer science and computer engineering in the fields of networking, computer security and software applications development.