This document discusses cyber security and the importance of protecting critical infrastructure and information societies from cyber threats. It notes that while information technologies provide benefits, societies have grown dependent on them and vulnerable to attacks. It argues that cyber security must be an important part of developing the information society and requires new technologies, policies, legislation, organizations, education, and cooperation across different levels including individuals, organizations, states, allies and the world. The document uses Estonia as an example of implementing different cyber security measures across these levels.