With the BLP model, security policies prevent information flowing downwards from a:
A.
Low security level
B.
High security level
C.
Medium security level
D.
Neutral security level
Explanation:
Bell-LaPadula is a state machine model capturing confidentiality aspects of access control. Access
permissions are defined through an Access Control matrix and through a partial ordering of security
levels. Security policies prevent information flowing downwards from a high security level to a low
security level. BLP only considers the information flow that occurs when a subject observes or alters
an object.
Surely the model deals in relativities. It prevents flow from High security to low security but also high security to medium security, medium security to low security and low security to lower security.
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