A system modeled by Bell-LaPadula has security levels Top Secret, Secret, Confid

Question

A system modeled by Bell-LaPadula has security levels Top Secret, Secret, Confidential, and Unclassified, and categories A, B, C, and D. Specify what type of access (read, write, both, neither) is allowed in each of the following cases:

Case 1: Cleared for (Top Secret, {B, C }) and wants access to a document classified (Secret {B, C, D})


Case 2: Cleared for (Confidential {A, B}) and wants access to a document classified (Confidential {A})


Case 3: Cleared for (Confidential {B, C}) and wants access to a document classified (Secret {C})


Case 4: Cleared for Top Secret ({B, C}) and wants access to a document classified (Confidential {B})

Explanation / Answer

Answer)

Type of access are : (read, write, both, neither)

Case 1: Cleared for (Top Secret, {B, C }) and wants access to a document classified (Secret {B, C, D})

Cannot read the documents as the and cannot write the documents as the user's clearance level does not dominate document’s classification level and vice versa.

Case 2: Cleared for (Confidential {A, B}) and wants access to a document classified (Confidential {A})

Can read and write be because user has the access to to dominate over the document’s clearance and also the document's classification level dominates the user's clearance level.

Case 3: Cleared for (Confidential {B, C}) and wants access to a document classified (Secret {C})

Cannot read the document as the clearance level for the user does not dominate over the document classification level. Cannot write the document as the document's classification level does not dominate over the user's clearance level.

Case 4: Cleared for Top Secret ({B, C}) and wants access to a document classified (Confidential {B})

Can read documents which is B, as the Top Secret clearance level dominates document’s classification level. But cannot write the document as the document classification level does not dominate the clearance in this regard.

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