As societies and economies increasingly rely on electronic telecommunications, they grow more vulnerable to threats from other computer systems. At the same time, states military and intelligence organizations are increasingly developing the capability to attack and defend these assets. As with the introduction of earlier weapons systems, some would-be users express the belief that the laws restraining warfare no longer apply. This essay seeks to explain the emerging relationship between technology, electronic telecommunications, and the laws of war. In particular, this essay seeks to show how the norm requiring the discrimination between military and civilian objectives may be retained in an era of long-distance warfare. Finally, it presents a model protocol to guide warriors and lawyers in planning or judging the legitimacy of information operations.