This book is a selection of the best papers presented at the NATO Advanced Research Workshop on dealing with the subject of Cyberspace Security and Defence. The level of individual contributions in the volume of sophisticated and suitable for seniors and graduate students, researchers and technology who want to get some sense of state of the art in several sub-disciplines of Cyberspace Security. Several papers give a broad brush of national security issues and a brief summary of the state of technology. This paper can be read and appreciated by the enlightened technical managers and executives who want to understand security issues and approaches for technical solutions.