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2003 Course Information System Security

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Total No. of Questions : 12] P1331 [Total No. of Pages : 3 [3664]-349 B.E. (I.T.) INFORMATION SYSTEM SECURITY (2003 Course) (414441) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer three questions from Section-I and three questions from Section-II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Your answers will be valued as a whole. 6) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. SECTION - I Q1) a) What are the two basic functions used in encryption algorithms? [6] b) What is the difference between Monoalphabetics and Polyalphabetics cipher? [6] c) What are the two problems with one time pad cipher? [6] OR Q2) a) Explain avalanche effect. [6] b) What is the difference between block and stream cipher? [6] c) Give examples of replay attacks. List approaches to deal with them.[6] Q3) a) Show that enforcement rules of Clark-Wilson model can emulate the Biba model. [8] b) Explain : [8] i) Mandatory. ii) Discretionary. iii) Role based access controls. OR Q4) a) Discuss the role of trust in security policy. [5] b) Discuss availability issues in security policies. [5] c) Compare and contrast confidentiality Vs. integrity policies. [6] P.T.O.

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