1. What is MAC? What is discretionary access control?

2. Given Example on p. 69, draw the lattice diagram. Given two security levels, decide whether one dominates the other. Justify your answer.

3. A system has two security classifications, TS and S, with TS>=S. The system has three categories, COMP, NUC and ASIA.

a. List all the security levels (pairs of classification and category subset).

b. Draw the lattice diagram. Draw security level (L1, C1) above security level (L2, C2) and draw a line between security level (L1, C1) and security level (L2, C2) if and only if security level (L1, C1) dominates security level (L2, C2).