The advent of cyberwarfare raises any number of legal quandaries, let alone ethical ones: when it's possible to do serious damage without crossing a border or firing a shot, where do you stop? NATO's Cooperative Cyber Defence Centre of Excellence (CCDCOE) is publishing the finished version of a non-binding guide, the Tallinn Manual, that could settle at least the legal disputes. For the most part, it demands a measured, one-for-one response and attempts to minimize collateral damage. Digital retaliation is
