2.docx - 4 Suppose a system implementing Bell-LaPadula\u2019s model used the same labels for security levels and categories as for integrity levels and

2.docx - 4 Suppose a system implementing Bell-LaPadula’s...

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4. Suppose a system implementing Bell-LaPadula’s model used the same labels for security levels and categories as for integrity levels and categories under the Biba model, which the system implemented. Under what conditions could one subject read an object? Write to an object? For reading a document under Bell-LaPadula security model the subjects security clearance level must dominate the objects classification level or : L(S) ≥ L(O). For reading a document under Biba model the subjects integrity level must dominate the objects integrity level: I(S) ≤ I(O). As in this case the security levels and categories are the same as integrity levels and categories : I(O) = L(O) and I(S)=L(S) Therefore, for reading a document the subjects and the object should be in the same level and category. L(s)=L(o) For writing a document under Bell-LaPadula security model the subjects clearance level must dominate the objects classification level or : L(S) ≤ L(O).
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