Let N be a large integer and let K = M = C = Z/NZ. For each of the functions e: K times M rightarrow C listed in (a) - (c), answer the following questions: Is e an encryption function? If e is an encryption function, what is its associated decryption function d? If e is not an encryption function, can you make it into an encryption function by using some smaller, yet reasonably large, set of keys? e_k(m) k - m (mod N). e_k(m) k middot m (mod N). e_k(m) (k + m)^2 (mod N).

Match the steps of the process to julia's analysis. 1. analyze choices. current costs for making phone calls to foreign countries averages between five and ten cents a minute. 2. determine the goals. julia needs to reduce the cost of telecommunications without reducing her employees' ability to do their jobs. 3. gather data. the corporate computer network will be able to handle the increased traffic that will occur as a result of voip. 4. evaluate the decision. julia will have her it department set up voip in the smallest domestic office. 5. make the decision. julia will have employees document the benefits and problems that result from using the new technology.

This is not a factor that you should use to determine the content of your presentation. your audience your goals your purpose your technology

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