When revelations about Stuxnet, a computer virus designed specifically to sabotage Iran’s nuclear programme, made the headlines in June 2010, cybersecurity shot to the top of many countries’ national security agendas. Many countries announced that they would beef up their offensive capabilities in cyberspace, inspiring fresh discussion about the development, use and control of cyberweapons and of surveillance technologies in cyberspace. What are the implications of these technologies for arms production and arms control? How realistic is it to try to control them through traditional arms control mechanisms?