GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
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Subject Code: 2170709
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION — WINTER 2018
Subject Name: Information and Network Security
Date: 19/11/2018
Time: 10:30 AM TO 01:00 PM
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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) Differentiate block cipher and a stream cipher. | MARKS | 03 |
| (b) Encrypt the Message “Surgical Strike” with key “GUJAR” using PLAYFAIR technique. | 04 | ||
| (c) Discuss in detail encryption and decryption process of DES. | 07 | ||
| Q.2 | (a) Distinguish between Symmetric encryption and Asymmetric encryption using suitable example. | 03 | |
| (b) Describe the term: Authentication, Authorization, Integrity and Non — repudiation. | 04 | ||
| (c) Discuss in detail encryption and decryption process of AES. | 07 | ||
| OR | |||
| (a) Encrypt the message "meet me at the usual place " using the Hill cipher with the key [9 5 4] | 07 | ||
| Q.3 | (a) Explain Avalanche Effect. | 03 | |
| (b) Discuss Man in Middle Attack. | 04 | ||
| (c) Explain in detail RSA algorithm, highlighting its security aspect. | 07 | ||
| OR | |||
| (a) Explain the VERNAM Cyphermethod. | 03 | ||
| (b) Explain the difference between diffusion and confusion. | 04 | ||
| (c) Briefly explain Diffie Hellman Key exchange with an example | 07 | ||
| Q.4 | (a) What is MAC ? How it useful in Crypto System. | 03 | |
| (b) Briefly explain-Digital Signature algorithm | 04 | ||
| (c) Described briefly the Authentication process covered by X.509. | 07 | ||
| OR | |||
| (a) Discuss HASH function and its application in Crypto System. | 03 | ||
| (b) Explain Different type of Attacks on Crypto System. | 04 | ||
| (c) Explain PGP with its Authentication and Confidentiality Operation. | 07 | ||
| Q.5 | (a) List out the various web security threats. | 03 | |
| (b) What is meant by message digest? Give an example. | 04 | ||
| (c) Discuss clearly Secure Hash Algorithm with its real time application. | 07 | ||
| OR | |||
| (a) Explain HAND SHAKE protocol in SSL. | 03 | ||
| (b) What is KDC? List the duties of a KDC. | 04 | ||
| (c) Explain digital signature schemes Elgamal and Schnorr. | 07 | ||
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