Which of the following statements accurately describes the primary objective of the Bell-LaPadula security model and the access-control rules it enforces?
It protects integrity by enforcing no read down and no write up.
It protects confidentiality by enforcing no read up and no write down.
It protects confidentiality by enforcing no read down and no write up.
It protects integrity by enforcing no read up and no write down.
The Bell-LaPadula model was created for military multilevel security systems to protect confidentiality. It enforces a no read-up, no write-down policy so that subjects cannot read data at a higher classification level or write data to a lower classification level, preventing unauthorized disclosure. The Biba model, by contrast, protects integrity with no read-down, no write-up rules.
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ISC2 CISSP
Security Architecture and Engineering
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