Working Paper Research Division EU/Europe Stiftung Wissenschaft und Politik German Institute for International and Security Affairs Annegret Bendiek, Tobias Metzger Deterrence theory in the cyber-century Lessons from a state-of-the-art literature review SWP Working Papers are online publications of SWP’s research divisions which have not been formally reviewed by the Institute. Ludwigkirchplatz 3−4 10719 Berlin Phone +49 30 880 07-0 Fax +49 30 880 07-100 www.swp-berlin.org Working Paper RD EU/Europe, 2015/ 02, May 2015
[email protected] SWP Berlin Table of Contents List of Figures 1 List of Abbreviations 2 Introduction 3 In theory – Deterrence theory and cyberspace 4 Deterrence-by-retaliation and deterrence-by-denial 6 In practice – Suitability of cyber: lessons and implications 7 Key challenges: Credibility and capability to display and use force 7 How to deter? Deterrence-by-denial and deterrence-by- retaliation 9 Determining the type of defence 9 Adding offence to the equation 10 When and whom to deter? Immediate vs. general deterrence and the challenge of attribution 10 What to deter? Narrow vs. broad deterrence 12 For whom? Central vs. extended deterrence 13 Conclusion and outlook 14 Annex 16 Glossary 16 List of References 17 List of Figures Figure 1: Limits to retaliation in cyberspace .................. 9 Figure 2: A possible model of escalation ....................... 11 Figure 3: EEAS figure on a possible inter-ministry division of labour ................................................................. 15 Figure 4: Risk assessment