Download GTU B.Tech 2020 Winter 7th Sem 2170709 Information And Network Security Question Paper

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Subject Code: 2170709

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020

Subject Name: Information and Network Security

Time: 10:30 AM TO 12:30 PM

Instructions:

1. Attempt any FOUR questions out of EIGHT questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. 1. Define: Confidentiality, Authenticity and Integrity. [03]
   2. Discuss Avalanche effect and Completeness property of a block cipher. [04]
   3. Explain Playfair cipher technique in detail. Find cipher text for plain text ‘GTUINSEXAM’ using ‘STUDY” as key. [07]

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2. 1. Compare and contrast symmetric key cryptography and asymmetric key cryptography. [03]
   2. Explain the process of key generation in DES. [04]
   3. Draw a detailed block diagram of encryption process in DES. Add appropriate description. [07]

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3. 1. Briefly explain Triple DES with two keys. [03]
   2. Explain public key cryptosystem with neat diagram. [04]
   3. Calculate all the values of RSA assuming two primes p=17 and q=11. Assume other values appropriately. [07]
4. 1. State the differences between chosen plain text and chosen cipher text attack. [03]

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   2. Write a short note on Man-in-the-middle attack. [04]
   3. Calculate all the values for Diffie-Hellman key exchange, consider two primes q=353 and a=3. Assume other values appropriately. [07]
5. 1. Enlist various web security threats. Explain any one. [03]
   2. Explain how Birthday attack is carried out. [04]

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   3. Define message authentication code and its characteristics. Discuss MAC based on any standard block cipher. [07]
6. 1. What are different ways for distribution of public keys? [03]
   2. Write a short note on PGP. [04]
   3. Justify the characteristics needed for a hash function. Explain Secure Hash Algorithm-1 in brief. [07]

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7. 1. What is defined by X.509 certificate? Write the process of authentication in X.509. [03]
   2. What is TGT? Explain its use in Kerberos. [04]
   3. Write a detailed note on SSL architecture and protocol. [07]

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8. 1. How does secure socket layer protocol work? [03]
   2. Explain key distribution process using Key Distribution Center (KDC). [04]
   3. Explain digital signature schemes Elgamal and Schnorr. [07]

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Date: 21/01/2021

Total Marks: 56