Trusted Computer System Evaluation Criteria (TCSEC)'s a United States Government Department of Defense (DoD) standard that sets basic requirements for assessing the effectiveness of computer security controls built into a computer system. The TCSEC was used to evaluate, classify and select computer systems being considered for the processing, storage and retrieval of sensitive or classified information. The TCSEC, frequently referred to as the Orange Book,'s the centerpiece of the DoD Rainbow S… (More on Tcsec)