Download GTU BE/B.Tech 2018 Winter 6th Sem Old 160702 Information Security Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 6th Sem Old 160702 Information Security Previous Question Paper

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Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VI (OLD) EXAMINATION ? WINTER 2018
Subject Code:160702 Date: 04/12/2018

Subject Name: Information Security

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Explain data confidentiality ,data authentication and non-repudiation 07
(b) What is cryptography? Briefly explain the model of Asymmetric
Cryptosystem
07

Q.2 (a) Explain monoalphabetic cipher and polyalphabetic cipher by giving an example. 07
(b) List various modes of operations of block cipher. Explain any three of them
briefly.
07
OR
(b) What is the purpose of S-box in DES? Explain the avalanche effect in DES. 07



Q.3 (a)
What is the limitation of Electronic Codebook Mode (ECB)? explain CBC mode
in detail.
07
(b) Explain public-key cryptosystem in detail. 07
OR
Q.3 (a) Explain Rail fence Cipher technique. 07
(b) Describe MD5 message digest algorithm.

07



Q.4 (a)
What is message authentication code? What are the requirements for MACs?
Briefly discuss MAC based on DES.
07
(b) Briefly explain Diffie-Hellman key exchange. Is it vulnerable to man in
the middle attack? Justify.
07
OR
Q.4 (a) What characteristics are needed in secure hash function? Explain the concept of
simple hash function.
07
(b) What is authentication? How it can be done using cryptography? 07



Q.5 (a)
Explain the general format of PGP(Pretty Good Privacy) message 07
(b) What are the requirements of digital signature? Explain the concept of
arbitrated digital signature.
07


OR
Q.5 (a)
Explain SSL architecture. 07
(b)
What problem was Kerberos designed to address? Briefly explain how
session key is distributed in Kerberos.
07

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