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SHW4 - Sample HW 4 Solutions Question 1 Exercise Chapter 6...

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Sample HW 4 Solutions Question 1 Exercise Chapter 6 Question 2 Contributions of Clark-Wilson model include: - Other models (such as Biba) assume existence of a trusted entity. CW model explicit requirement that entities and actions must. For example, method of upgrading an entity is itself a TP that has been certify. Inclusion of certification and enforcement rules allows such implicitly assumed requirements explicit part of the model. - Certification of the method to upgrade data to higher level (e.g., from UDI to CDI) in CW is more practical in compared to that in Integrity models where an assumed trusted entity will need to pass every input sent to a process running at an integrity level higher than that of the input. - The notion of separation of duty and separation of function are more explicitly captured in CW than in others. Question 3 Assume that Alice and Bob are friends. Consider two conflict of class sets COI 1 = {X, Y} and COI 2 = {U, V}. Let CD X , CD Y , CD U , and CD V
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