Together with the Munich Security Conference, we organized the Cyber Security Summit (CSS) in May 2018 for the sixth time. The venue for this year’s event was Tallinn. About 150 high-ranking international politicians, top managers, and scientists met at the conference to discuss the biggest cyber security challenges. Key topics included critical infrastructures as a target of hacker attacks, strategies to combat terrorist use of the internet and the impact of artificial intelligence or the Internet of Things (IoT) on the future of international conflicts. The summit also discussed which new rules are needed in the digital age. CEO Timotheus Höttges called for an early warning and coordination system based on the model of the World Health Organization (WHO), which deals with and combats the dangers in virtual space like epidemics.