This book is actually a scientific and practical encyclopedia on modern cybersecurity. It analyzes the background, history, methods and features of cybercrime, cyberterrorism, cyberintelligence and cyber counterintelligence, the stages of development of cyberweapons, the theory and practice of their use, the technological platform of cyberweapons (viruses, software and hardware trojans), protection methods (antivirus programs, proactive antivirus protection, cyberimmune OS). For the first time in the world scientific and technical literature, the results of a systematic author's analysis of all known vulnerabilities in modern cyber defense systems are presented - in software, cryptographic algorithms, cryptographic equipment, microcircuits, mobile phones, on-board electronic equipment of cars, aircraft and even drones. It also presents the main concepts, national standards and methods for ensuring cybersecurity of critical infrastructures in the USA, England, the Netherlands, Canada, as well as the main international standards. In fact, the volume of one book contains materials from three different books, aimed at both novice users, mid-level specialists, and high-level cybersecurity specialists, who will also find a lot of useful information here.Knowledge that you learn from this book will help you improve your online security, secure your office and home devices, learn and implement the most effective and proven security policies in practice.