Book excerpt: First, the historical turning points in the development of the computer industry are examined in our book, with special focus on the "dark side" that saw the birth of worms, viruses, Trojan horses, and a threat environment that drove the need for a developing area of cybersecurity. Protective design objectives are used to describe our critical infrastructure protection and engineering design issues. For the preservation of national security concerns, a vigilant cyber intelligence capability is required in order to handle cyber disputes and, more importantly, to prevent or combat cyberwarfare. Cyberspace and the cyber warfare environment must be taken into account in order to comprehend the components that make cyberwar viable in terms of both offensive and defensive operations.