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INSE 6130/2 WW (Operating System Security) 2006 Fall

Prof. Lingyu Wang

Sample Exam Questions
Important notice: These sample questions are only intended for reference purposes. The actual exam will have problems that are different in format and in nature, problems that cover broader topics, and problems that are more difficult. 1. Link each example to one corresponding term and all corresponding security objectives: Term Snooping
Example

Security Objectives

A network sniffer captures transmitted password Confidentiality and later replays the password to gain Integrity unauthorized access (As this is a sample question, there is only one row in the table, so the answer is already given) 2. Consider the following scenario. In a class, we have students Alice, Bob, Eve, and an instructor Mallory. Suppose Alice, Bob, and Mallory each own a textbook, but Eve does not. Also suppose the instructor can ask students questions and students can answer; at the same time, students can also ask instructor, to which both instructor and other students can answer; however, a student cannot ask other students questions in class. Draw an access control matrix to model the above rules.

Suppose it is decided that each person can read his/her own textbook in class. Write one command to make the required changes to the access control matrix.

3. Answer true or false to the following questions by circling the correct answer: If an algorithm could be found to say ‘secure’ for all input protection systems that are indeed secure, then the algorithm can decide the safety problem true False

4. Change your access control matrix in Question 2 into an access control list (ACL) and a capability list (C-List), respectively.

5. In order to support separation of duty in RBAC, we use a constraint saying that no user can ever play two conflicting roles at the same time, such as TA

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