They are expected to keep abreast of new and evolving techniques for identifying mission-critical assets. In a large and complex enterprise, it is difficult to know how problems in a portion of an IT infrastructure may affect the broader operational mission.
CJA provides a methodology to help understand what is most critical—beginning during systems development and continuing through system deployment. MAE offers a common, repeatable risk management process that is part of building secure and resilient systems [3].
The underlying premise for performing a CJA is that protection strategies focused entirely on "keeping the adversary out" are usually doomed to fail recall the Maginot Line. The Advanced Cyber Threat ACT has sophisticated capabilities that adversaries can use to gain and maintain a persistent presence in the hardware and software that make up mission systems—providing the opportunity to "attack" i.
Organizations especially operational units often have limited resources to use to find their mission-critical cyber assets, and yet they need a reasonably accurate idea of what those are. One technique for performing a CJA makes use of "dependency maps" [4]. This technique stemmed from a need for a convenient but moderately rigorous approach—with more detail and structure than a questionnaire could provide. The dependency map method uses facilitated discussions with system subject matter experts SMEs to assemble a model, from the top down, as shown in Figure 2 [6].
Government interest in identifying, prioritizing, and protecting critical elements of the national infrastructure crosses all departments and stems from Homeland Security Presidential Directive 7 HSPD-7 [7]. The NIPP outlines a risk management strategy that allows for choices of risk management methodologies so long as they meet certain criteria. Among the core criteria for making consequence or impact assessments is "mission disruption.
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