This document outlines Indonesia's national cyber security strategy. It discusses the importance of ICT for Indonesia's economic growth and identifies Indonesia as the 4th largest mobile market and 8th largest internet user market. It describes three dimensions of cyber threats, examples of cyber attacks, and obstacles facing Indonesia's cyber security. It proposes six priority strategies: strengthening policies and regulations; establishing governance and organization; protecting critical infrastructure; implementing security systems and technology; building human resource capacity; and international collaboration. The strategies are intended to secure Indonesia's cyberspace and sovereignty from growing cyber threats.