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hw4 - Department Manager(Debbie Project Manager(Mukesh...

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11/19/2009 CSE 565: Computer Security Due: December 1, 2009 Homework 4 Question 1: (Optional) Problem 14.1. This question is on Propagating Cipher Block Chaining Mode of DES encryption. We didn’t go through this in the class. However, the material is available in Ch. 14 Appendix. Read and understand the PCBC mode and answer the question. The answer is quite simple. Question 2: (Optional) Problem No. 14.4 from Stallings. This problem requires some critical thinking. The answer is very simple. Question 3: a) In Kerberos Version 4, what is the purpose of the authenticator message? Does including authenticator message from the client to either the Ticket Granting Server or the Server provide complete security for the service? b) What are the basic differences between Kerberos Version 4 and Version 5? Question 4: In the context of Kerberos, what is a realm? Question 5: (Optional) This question is on the material from Chapters 14 and 15. What is a chain of certiFcates? In an organization with the hierarchy of Divisional Manager (Diana),
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Unformatted text preview: Department Manager (Debbie), Project Manager (Mukesh), Group Leader (Camilla), Task Leader (Betty) and Worker (Bob), show the steps in creating Bob’s certiFcate where Bob is at the lowest level of hierarchy. Note that Bob’s certiFcate is his individual certiFcate combined with all certiFcates for those above him in the line of hierarchy. You can assume that the President (Edward) is superior to Diana and is at the topmost level of hierarchy. In answering this question, assume that there is no central certiFcate authority. Use a neat diagram to show the ±ow of information during the creation of Bob’s certiFcate. A descriptive answer in no more than two to three short paragraphs is also sufFcient. Question 6: Problem 15.2 from Stallings. Hint: Think along the lines of Birthday paradox. Use eq. (11.6). Question 7: (Optional) Problem 16.2 from Stallings. 1...
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