GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (Old) EXAMINATION - WINTER 2019
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Subject Code: 160702 Date: 12/12/2019
Subject Name: Information Security
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Draw the block diagram and explain Shannon’s theory of communication. 07
(b) (1) Encrypt the text “trust” using Caesar Cipher with key=25 02
(2) Compare the strength of mono-alphabetic ciphers to poly-alphabetic ciphers. 05
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Q.2 (a) State the principles for block cipher design and explain in detail. 07
(b) Explain S-DES with necessary block diagram. 07
OR
(b) Explain Blowfish with necessary block diagram. 07
Q.3 (a) Explain Diffie-Hellman key exchange protocol with block diagram and example. 07
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(b) What are “relatively prime” numbers? Explain Euler’s theorem the importance of modular arithmetic in information security. 07
OR
Q.3 (a) Explain RSA algorithm with appropriate block diagram and example. 07
(b) How does ECC work? What are its advantages over other encryption algorithms? 07
Q.4 (a) What is e-commerce? Discuss requirement of security w.r.t. e-commerce transactions. 07
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(b) Explain Kerberos authentication protocol with necessary diagrams. 07
OR
Q.4 (a) What is SHA-256? Explain with necessary block diagram. 07
(b) Why is X.509 directory authentication service used? Explain its working. 07
Q.5 (a) Write a short note on Secure Electronic Transactions. 07
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(b) Write a short note on IP security. 07
OR
Q.5 (a) What is a firewall? What are standard firewall design principles? 07
(b) Explain how PGP is important for email security. 07
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