Computer Theology uses the term secure core for either a secure computer or the secure part of a computer. This term encompasses, and is more general than, the term Trusted Computing Base introduced in 1985 by the US Department of Defense:
"The security-relevant portions of a system are referred to throughout this document as the Trusted Computing Base (TCB)."
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Department of Defense Standard
Department of Defense
Trusted Computer System Evaluation Criteria
DoD 5200.28-STD December 26, 1985
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