The Trusted Computer System Evaluation Criteria (TCSEC) is the standard used for evaluating the effectiveness of security controls built into ADP systems. The TCSEC is divided into four divisions: D, C, B, and A, ordered in a hierarchical manner with the highest division, A, being reserved for systems providing the best available level of assurance. Within divisions C through A are a number of subdivisions known as classes, which are also ordered in a hierarchical manner to represent different levels of security in these classes.
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