1. (DUE September 13, 2005 by midnight EDT) Briefly discuss what you learned from the readings in chapters 5-7:
   • What was the most surprising thing you learned?
   • What was the most difficult part for you?
2. (DUE September 13, 2005 by midnight EDT) Select one of the following questions to discuss in detail through the threaded discussion.
   • Compare and contrast the Bell-LaPadula Model with the Biba Integrity Model. How does the Chinese Wall Model encompass both?
   • Construct an access control matrix for the subjects and objects of Lipner’s commercial model. The matrix will have entries for r (read) and w (write) rights. Discuss how this matrix is consistent with the requirements of section 6.1.
   • How would you go about developing a model for availability? Describe what you would want to include in this model.
3. (DUE September 18, 2005 by midnight EDT) Select a discussion from one or more of your classmates and respond to their comments.

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