The paper addresses several issues in the morality of cyberwar and cyberwarfare, defined as one nation's attacks on the governmental or civilian information systems of another nation. It sketches the diverse technical ways in which an attack may occur, including denial-of-service attacks and the insertion of various forms of malware. It argues that existing international law and widely discussed principles of Just War Theory do not straightforwardly apply to cyberwarfare, and many forms of cyberwarfare differ from previous forms of warfare (...) in neither injuring nor killing human beings, nor causing lasting physical damage ? but can nevertheless cause serious harm to a nation's vital interests. Another dissimilarity with traditional warfare is in the degree of knowledge of the identity of an attacker (the ?attribution problem?). The paper argues that cyberwarfare is not amenable to regulation by international pacts and that we can expect long periods of low-level, multilateral cyberwarfare, a Cyber Cold War, as a game-theoretic equilibrium is sought,. The paper laments the lack of a cyberwarfare policy, and concludes that it is only by applying game-theoretic principles that strategies can be discovered that are both moral and effective in suppressing overall harm to all parties in the long run. (shrink)

In this article I address differences between myself and Uwe Steinhoff in relation to the moral principle of reciprocity and its implications for the doctrine of the moral equality of combatants. Whereas I agree with Steinhoff that there is a principle of reciprocity in play in war, contra Steinhoff, I suggest that this principle and, indeed, moral principles of reciprocity more generally, are particularist principles, although if conventionalised or given legal status they can assume a generalised form. Moreover, I also (...) hold that there is a moral difference between those fighting a just war and those fighting an unjust war and this difference, taken in conjunction with the moral equality of combatants doctrine, generates a degree of moral complexity that seems to have gone unrecognised by Steinhoff (and, for that matter, by the two dominant schools of thought in this area, revisionists and Walzerians). (shrink)