This page provides all possible meanings and translations of the word orange book
The New Hacker's Dictionary
The U.S. Government's (now obsolete) standards document
Trusted Computer System Evaluation Criteria, DOD standard
5200.28-STD, December, 1985 which characterize secure computing
architectures and defines levels A1 (most secure) through D (least).
Modern Unixes are roughly C2. See also
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