Computer network security is no longer an obscure topic of interest to a handful of academics, government agencies, and hackers; it is a real concern to any member of a modern society. As first time computer security students and newly minted practitioners navigate their careers as software engineers, managers, and lawyers, they need to be exposed to the breadth of the space, and what trends and principles to look out for. The Craft of System Security arms readers with a deep understanding of what they need to know in order to meet today's (and tomorrow's) security challenges. This book presents the modern security practitioner's toolkit; more importantly, this book also takes readers into the deeper world of why these tools exist and how to use them in order to solve real problems. The book gives readers both practical knowledge and an understanding of the fundamentals that will provide an understanding of the issues they will face. To master the toolkit in this way is to understand the art of system security. If a student or professional only buys one book on computer security, this is the book to buy.