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In military doctrine, key terrain refers to areas which, if seized, afford an advantage to an attacker or defender. When applied to geographic terrain, this definition is clear. Key terrain might include a hill that overlooks a valley an enemy wants to control or a crossing point over a river that must be traversed before launching an attack. By definition, dominance of key terrain is likely to decide the overall outcome of a battle. While cyber key terrain is similar to geographic key terrain in some ways, there are also significant and often counterintuitive differences. Some consider cyber terrain to be tied to a physical location and to be represented in cyberspace by routers, switches, cables, and other devices. We will argue that key terrain in cyberspace exists at all of the cyberspace planes, which include the geographic, physical, logical, cyber persona, and supervisory planes [1]. In many cases, features of cyber terrain will not …