A handbook for engineers, architects and other practitioners working in the field of Internet security. It presents detailed coverage of security technologies and techniques for IP (Internet protocol) multicast networks from the leading developer of the standards. It also examines important security issues relating to other group communication technologies. Algorithms and protocols for multi-party secure communication are included. Technical managers could use this volume as a guide to the state of multicast and group security, without necessarily having to know all the detailed algorithms. Computer scientists and research and development personnel could use it as a survey of the technologies, approaches and algorithms used to provide a secure multicast solution.