Episode 38: Security Models: Bell-LaPadula, Biba, Clark-Wilson

Security models are theoretical frameworks that help define how systems enforce access control, integrity, and confidentiality. In this episode, we review the three classic models: Bell-LaPadula (focused on confidentiality), Biba (focused on integrity), and Clark-Wilson (focused on well-formed transactions and separation of duties). We explain the core rules behind each model—like “no read up” and “no write down”—and discuss where each is applied in government, commercial, and financial systems. Understanding these models gives you a structured way to think about how systems enforce security.

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