Annotation: Terrorism and the Internet are related in two main ways. First, the Internet has become a forum for terrorist groups and individual terrorists both to spread their messages of hate and violence and to communicate with one another and their sympathizers. Secondly, individuals and groups have tried to attack computer networks, including those on the Internet, what has become known as cyber terrorism or cyber warfare. Digital development index is indicator which measures the level of Information Communication Technology (ICT) adoption of countries. Purpose of this article is to find correlation functions of Denial-of-Service (DoS) attacks (most known cyber terrorist method) and index of digital development of countries and provide information of their relations.