Download JNTUA M.Tech 2nd Sem 2017 Feb 9D06106a Network Security And Cryptography Question Paper

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Code: 9D06106a

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M.Tech II Semester Supplementary Examinations January/February 2017

NETWORK SECURITY & CRYPTOGRAPHY

(Electronics & Communication Engineering)

Time: 3 hours

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Max. Marks: 60

Answer any FIVE questions

All questions carry equal marks

1. (a) What are the various services to be offered for enhancing the security of the information processing system?
   (b) Explain the different security attacks in detail.

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2. (a) Explain a symmetric encryption scheme and its ingredients.
   (b) Explain the block cipher which is a Feistel structure that makes use of key dependent S-boxes.
3. (a) State and prove Fermat's and Euler's theorem.
   (b) Explain Diffie – Hellman key exchange algorithm.
4. (a) Explain how message authentication is achieved.
   

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   (b) What is Hash function? Explain some approaches for producing message authentication.
5. (a) Explain the functioning of HMAC algorithm.
   (b) What is the difference between Hash and MAC functions?
6. (a) Discuss the concepts of trusted systems.
   (b) Explain how X-509 authentication service works.

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7. (a) Explain the IP security architecture in detail.
   (b) What are the three threats associated with user authentication over a network or internet and explain the same.
8. (a) List and briefly explain three classes of intruders.
   (b) Explain how two way authentication header guards against the replay attack.

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