BLP (Bell-LaPadula) Theorem

The Bell-LaPadula (BLP) Theorem is a security model focused on protecting sensitive information. It enforces rules so that individuals with lower security clearance cannot access higher-level classified data (no read-up), and those with higher clearance cannot share lower-level information (no write-down). This helps prevent accidental or intentional data leaks across security levels, maintaining confidentiality. Think of it as a digital "need to know" system that ensures sensitive information stays within authorized boundaries, supporting secure data handling in government and military environments.