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This paper presents a taxonomy of operational cyber security risks that attempts to identify and organize the sources of operational cyber security risk into four classes: actions of people, systems and technology failures, failed internal processes, and external events. Each class is broken down into subclasses, which are described by their elements. This report discusses the harmonization of the taxonomy with other risk and security activities, particularly those described by the Federal Information Security Management Act (FISMA), the National Institute of Standards and Technology (NIST) Special Publications, and the CERT Operationally Critical Threat, Asset, and Vulnerability EvaluationSM (OCTAVE) method.
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