What are design patterns?

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1. What is the difference between a nongenerative and a generative pattern? (5 points)
2. What are design patterns? Explore four security related design patterns, one pattern that
focuses on confidentially, one pattern that focuses on integrity, one pattern that focuses on
availability and a fourth one, that focuses on privacy. Discuss the security problem each of these
patterns solve, the context for which the pattern can be applied to and the forces (constraints,
limitations). (20 points)
3. Consider one of the following interactive applications (20 points)
a. A secure automated course registration system for a university
b. A secure library management system
c. An Internet-based polling booth for public elections
d. A secure home banking system
Develop a user model, design model, mental model, and an implementation model, for any one of
these systems.
4. Develop two additional design principles that “reduce the user’s memory load.” (5 points)

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