1 Introduction In Turkey, the use of information and communication technologies (ICTs) has been spreading rapidly and ICTs are playing important roles in all aspects of our lives. In addition to public sector organizations, organizations which provide services in critical infrastructure sectors like energy, water resources, health, transportation, communication and financial services have also been heavily using information and communication systems. These systems improve the quality and the speed of the services being provided, thus helping organizations work more productively, contributing to the improvement of living standards. As our public sector organizations use ICTs to provide services at an increased rate, it has become an important aspect of our national security and competitiveness to ensure the security of information and communication technologies. The vulnerabilities inherent in ICTs may cause denial of service or abuse of service attacks, resulting in potential loss of lives, high scale economic losses, disturbance of public order and/or threats to national security. It is a fact that cyber space offers opportunities of anonymity and deniability for attacks on information systems and data. The tools and knowledge required for attacks are often cheap and easy to get, and it has been observed that anyone or any systems across the world can participate in cyber-attacks, either knowingly or unknowingly. And it is deemed almost impossible to determine who finances and organizes these enduring and advanced cyber-attacks that target the National Cyber Security Strategy and 2013-2014 Action Plan 5/47