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Bell–LaPadula model
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==Limitations== * Only addresses confidentiality, control of writing (one form of integrity), *-property and discretionary access control * Covert channels are mentioned but are not addressed comprehensively * The tranquility principle limits its applicability to systems where security levels do not change dynamically. It allows controlled copying from high to low via trusted subjects. [Ed. Not many systems using BLP include dynamic changes to object security levels.]
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