Crytography And Network Security IT2352 ND2013 7th Semester Question Paper

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Anna University Question. Paper Code :.31513

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2013.

Seventh Semester

Computer Science and Engineering 

IT 2352/IT 62/10144 IT 603/10144 CSE 46 — CRYPTOGRAPHY AND NETWORK SECURITY (Common to Sixth Semester — Information Technology) 

(Regulation 2008/2010) 

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PART.A — (10 x 2 = 20 marks)

1. Give an example each for, substitution and transposition ciphers
2. Why modular arithmetic has been used in cryptography?
3. What are the modes of DES?
4. List the uses of RC4.
5. Write any"two differences between MD4 and secure hash algorithni.
6. How digital signature is different from conventional? Give any two.
7. Define SET.
8. What do you mean by PGP?
9. What are the effects of malicious software? Write any two.
10. What is 'Worm'?

PART B (5 x 16= 80 marks)

11. (a) (i) What are the different types of attacks? Explain. (8)
(ii) State and explain Chinese remainder theorem with example. (8)