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530-f03-mtexam

# 530-f03-mtexam - CSci 530 Midterm Examination(Fall 2003...

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CSci 530 Midterm Examination (Fall 2003) Instructions: Show all work. If a question asks for a numerical or algebraical result, indicate your answer clearly (for example, by drawing a box around it). No computers are allowed; handheld calculaters are permitted. This exam is open book, open notes. You have 90 minutes to complete the exam. If you need more space to answer any of the questions, attach a separate sheet of paper; if you do so, please use a di erent sheet of paper for each question. There are 100 points in all. 1. (24 points) In this problem, you will carry out a simple RSA key generation and encryption. For all parts, let p = 11; q = 29; e = 3. (a) (5 points) Find d. (b) (3 points) What is the largest number that can be encrypted using this key pair? (c) (8 points) What ciphertext c do you get when you encrypt the plaintext m = 23? (d) (8 points) What plaintext m encrypts to the ciphertext c = 23? (Reminder: Show all work!) 2. (21 points, 7 points each) Answer each question in one paragraph or so.

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530-f03-mtexam - CSci 530 Midterm Examination(Fall 2003...

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