Specific versions evaluated at DoD NCSC Class C2 and, with the SEVMS security enhanced services support, at NCSC Class B1, per the NCSC Rainbow Series.
In the book entitled Applied Cryptography, security expert Bruce Schneier states of NCSC-TG-021 that he "can't even begin to describe the color of the cover" and that some of the books in this series have "hideously colored covers."
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Phreak called them "those Crayola books" and Cereal replied, "Oh yeah, Technicolor rainbow." However the other books, such as the Peter Norton "pink shirt book" (The Peter Norton Programmer's Guide to the IBM PC), are not part of the Rainbow Series.
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