Reference no: EM131210861
1. Explain the intuition behind the two rules in the Bell-LaPadula model for mandatory access control.
2. Give an example of how covert channels can be used to defeat the Bell-LaPadula model.
3. Give an example of polyinstantiation.
4. Describe a scenario in which mandatory access controls prevent a breach of security that cannot be prevented through discretionary controls.
5. Describe a scenario in which discretionary access controls are required to enforce a security policy that cannot be enforced using only mandatory controls.
6. If a DBMS already supports discretionary and mandatory access controls, is there a need for encryption?
7. Explain the need for each of the following limits in a statistical database system:
(a) A maximum on the number of queries a user can pose.
(b) A minimum on the number of tuples involved in answering a query.
(c) A maximum on the intersection of two queries (i.e., on the number of tuples that both queries examine).
8. Explain the use of an audit trail, with special reference to a statistical database system.
9. What is the role of the DBA with respect to security?
10. What is public-key encryption? How does it differ from the encryption approach taken in the Data Encryption Standard (DES), and in what ways is it better than DES?
11. What are one-way functions, and what role do they play in public-key encryption?
12. Explain how a company offering services on the Internet could use public-key encryption to make its order-entry process secure. Describe how you would use DES encryption for the same purpose, and contrast the public-key and DES approaches
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What is the role of the dba with respect to security
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