ABSTRACT. The 21st century is characterized by migration of political, social or criminal processes to cyberspace. Similar tendencies are also observed in terms of terrorism. Terrorist groups do not possess cyber-attacks sufficient to cause significant harm and therefore prefer conventional attacks. However, if at least one year ago, conventional attacks were the only mechanism available to them to cause real damage and fear, nowadays the likelihood of cyber-attacks is likely to increase, due to better aware extremist generation and the failure of the conventional forces of terrorist organizations in Afghanistan and Syria-Iraq