In this chapter I propose an ethical analysis of information warfare, the warfare waged in the cyber domain. The goal is twofold, filling the theoretical vacuum surrounding this phenomenon and providing the conceptual grounding for the definition of new ethical regulations for information warfare. I argue that Just War Theory is a necessary but not sufficient instrument for considering the ethical implications of information warfare and that a suitable ethical analysis of this kind of warfare is developed when Just War Theory is merged with Information Ethics. In the initial part of the chapter, I describe information warfare and its main features and highlight the problems that arise when Just War Theory is endorsed as a means of addressin...