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which generates dynamically changing permissions?

Which of the following security models introduced the idea of mutual exclusivity which generates dynamically
changing permissions?

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A.
Biba

B.
Brewer & Nash

C.
Graham-Denning

D.
Clark-Wilson

Explanation:
The Brewer and Nash model, also called the Chinese Wall model, was created to provide access controls that
can change dynamically depending upon a user’s previous actions. The main goal of the model is to protect
against conflicts of interest by users’ access attempts.
Under the Brewer and Nash model, company sensitive information is categorized into mutually disjointed
conflict-of-interest categories. If you have access to one set of data, you cannot access the other sets of data.
Incorrect Answers:
A: The Biba model deals with integrity. It does not use dynamically changing permissions.
C: The Graham-Denning model shows how subjects and objects should be securely created and deleted. It
also addresses how to assign specific access rights. It does not use dynamically changing permissions.
D: The Clark-Wilson model deals with integrity. It does not use dynamically changing permissions.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 383


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