Download GTU BE/B.Tech 2018 Winter 7th Sem New 2170709 Information And Network Security Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2170709 Information And Network Security Previous Question Paper

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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2170709 Date: 19/11/2018

Subject Name: Information and Network Security

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Differentiate block cipher and a stream cipher. 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
(c) Encrypt the message "meet me at the usual place " using the Hill
cipher with the key 9 4
5 7
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
Q.3 (a) Explain the VERNAM Cypher method. 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
Q.4 (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
Q.5 (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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