Book excerpt: The marriage of computers and telecommunications, the global integration of these technologies and their availability at low cost is bringing about a fundamental transformation in the way humans communicate and interact. But however much consensus there may be on the growing importance of information technology today, agreement is far more elusive when it comes to pinning down the impact of this development on security issues. Written by scholars in international relations, this volume focuses on the role of the state in defending against cyber threats and in securing the information age. The manuscript is captivating with the significance and actuality of the issues discussed and the logical, knowledgeable and engaged presentation of the issues. The essays intrigue and provoke with a number of 'fresh' hypotheses, observations and suggestions, and they contribute to mapping the diverse layers, actors, approaches and policies of the cyber security realm.