Which of the following security models focuses on data confidentiality and controlled access to classified information?
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A. B. C. D.A.
The security model that focuses on data confidentiality and controlled access to classified information is the Bell-La Padula model, option A.
The Bell-La Padula (BLP) model is a formal model used to describe and analyze computer security policies. It was developed in 1973 by David Bell and Leonard La Padula at the Mitre Corporation. The BLP model is primarily concerned with confidentiality and access control, and it is designed to enforce a strict hierarchy of security clearances.
In the BLP model, data is classified according to a set of predefined security levels. These security levels are arranged in a strict hierarchical order, with higher security levels being more sensitive than lower levels. Access to data is restricted based on the security clearance of the user and the security level of the data. The BLP model enforces two rules: the Simple Security Property (SSP) and the *-Property (Star Property).
The SSP states that a subject (i.e., a user or a process) can only access an object (i.e., a file or a resource) if the security level of the subject is greater than or equal to the security level of the object. This means that a user with a high security clearance can access data at a lower security level but not vice versa.
The *-Property states that a subject can only write to an object if the security level of the subject is less than or equal to the security level of the object. This ensures that information is not leaked from a high-security level to a lower one.
Overall, the BLP model provides a formal framework for enforcing strict confidentiality and access control policies for classified information.