The Computer Security Policy Model Orange Book is based is the Bell-LaPadula Model. Orange Book Glossary. The Data Encryption Standard (DES) is a cryptographic algorithm. National Information Security Glossary. TEMPEST is related to limiting the electromagnetic emanations from electronic equipment. Reference: U.S. Department of Defense, Trusted Computer System Evaluation Criteria (Orange Book), DOD 5200.28-STD. December 1985 (also available here).