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Cyberterrorism and cybercrime are on the rise. One new webpage was infected every 4.5 seconds by malicious email attachments in 2008, five times more than the previous year. The normal computer user also has to fight against new 'scareware' or fake antivirus software websites (five new ones identified every day) and the ubiquitous spam. It seems clear that the more technology advances, the greater the increase in the number of threats. According to expert reports there were more than 237 million attacks to information security all over the world in the first half of 2005 only. States cannot control cyber crime at the individual level and international cooperation is highly needed. Securing cyberspace is, however, extremely difficult, as it requires facing strategic challenges and cooperation between the public, private, military and civilian sectors of our society. It is therefore necessary to fully understand the characteristics, principles and challenges that underlie the development of secure information systems.This book is one of the first comprehensive attempts to address all the issues mentioned above and highlights the urgent need of a multidisciplinary approach to cope with cyber threats. It presents all the factors that need to be taken into consideration, rethinks current strategies and identifies urgent measures to be taken in order to minimize the strategic and economic impact of cyber attacks. "Modelling Cyber Security: Approaches, Methodology, Strategies" could be of great interest to engineers working on IT security and everybody - from government departments to small companies and regular internet users - concerned with the overall impact of security in the net.