MID_NS_VII - Q.1. Explain the DES algorithm with the help...

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Birla Institute of Technology & Science, Pilani Distance Learning Programmes Division Second Semester 2006-2007 Mid-Semester Test (EC-1 Regular) Course No. : SS ZG513 Course Title : NETWORK SECURITY Nature of Exam : Closed Book Weightage : 40% Duration : 2 Hours Date of Exam : 03/02/2007 (FN) Note: 1. Please follow all the Instructions to Candidates given on the cover page of the answer book. 2. All parts of a question should be answered consecutively. Each answer should start from a fresh page. 3. Mobile phones and computers of any kind should not be brought inside the examination hall. 4. Use of any unfair means will result in severe disciplinary action.
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Unformatted text preview: Q.1. Explain the DES algorithm with the help of suitable diagram(s). [13] Q.2. Explain clearly the working of the RSA algorithm. Compare briefly the speeds of RSA and DES. State how security is achieved in RSA. [10 + 2 + 1 = 13] Q.3 (a) Discuss briefly an efficient algorithm to compute a x mod n. Show how the algorithm works when a = 51, x = 16, n = 7. [4 + 2 = 6] Q.3 (b) Consider the equation ax ≡ 1 mod n given a and n (n > 1). State the condition for the equation to have a unique solution modulo n. Solve the equation when a = 55, n = 97. [2 + 6 = 8] ******** No. of Pages = 1 No. of Questions = 3...
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