Trusted Computing Base (TCB) Glossary Definition

Trusted Computing Base (TCB) is a security-architecture concept used to isolate functions, enforce trust decisions, or define the boundary between protected and untrusted activity.

Trusted Computing Base (TCB) appears in security documentation, assessments, audit findings, risk reports, architecture reviews, and operational procedures. It is retained here because professionals may encounter the term in NIST guidance, security reviews, or technical documentation and need a concise public explanation.