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2003 Course Network & Information Security

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Total No. of Questions : 12] P1446 [Total No. of Pages : 2 [3764]-419 B.E. (Computer Engg.) NETWORK AND INFORMATION SECURITY (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidate: 1) Attempt any three questions from Section-I and three questions from Section-II. 2) Figures to the right indicate full marks. 3) Draw neat diagrams must be drawn wherever necessary. 4) Make suitable assumptions wherever necessary. SECTION - I Q1) a) b) Q2) a) What do you mean by packet sniffing and snooping? What are the different means to carry out these attacks? [8] What are different security threats? Explain various types of passive and active security attack. [8] OR What do you mean by Code Injection? Differentiate between worms, viruses and Trojan Horses. [8] b) Explain Man-in-Middle and Replay attacks with suitable example. What are different security measures to control these attacks? [8] Q3) a) "Public key cryptography complements private key cryptography rather than replaces it". Justify with example. [6] b) What are different requirements of kerberos? Explain the architecture of kerberos. What do you mean by kerberos Realms? [10] OR Differentiate between MD5 and SHA-1 hash algorithms. [6] Q4) a) b) Q5) a) b) Explain X.509 Authentication service in details. [10] What are different variations of DES algorithm and how it works? [8] What is elliptical curve cryptography (ECC)? What are various implementation choices for ECC? [10] OR P.T.O. 1

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