GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
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Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
Subject Code:160702 Date: 04/12/2018
Subject Name: Information Security
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
(b) What is cryptography? Briefly explain the model of Asymmetric Cryptosystem 07
(b) List various modes of operations of block cipher. Explain any three of them 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
OR
(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? 07
OR
(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
OR
(a) Explain SSL architecture. 07
(b) What problem was Kerberos designed to address? Briefly explain how session key is distributed in Kerberos. 07
Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VI (OLD) EXAMINATION - WINTER 2018Subject Code:160702 Date: 04/12/2018
Subject Name: Information Security
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
(b) What is cryptography? Briefly explain the model of Asymmetric Cryptosystem 07
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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 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
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(b) Explain public-key cryptosystem in detail. 07OR
(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? 07
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(b) Briefly explain Diffie-Hellman key exchange. Is it vulnerable to man in the middle attack? Justify. 07OR
(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
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(b) What are the requirements of digital signature? Explain the concept of arbitrated digital signature. 07OR
(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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