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Posted By: Sree.... Member Level: Diamond Posted Date: 15 Jun 2008
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2006 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech NETWORK SECURITY AND CRYPTOGRAPHY Set No. 4 Question paper
Code No: RR410504 Set No. 4
IV B.Tech I Semester Supplementary Examinations, March 2006
NETWORK SECURITY AND CRYPTOGRAPHY
(Computer Science & Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) What are differences between a block cipher and a stream cipher? [8M]
(b) Explain various modes of operations of block ciphers. [8M]
2. (a) List the characteristics of advanced block ciphers. [8M]
(b) What are the differences between RC5 and RC2? [8M]
3. (a) Consider the Elliptic curve E11 (1,6) that is , the curve is defined by y
2 =
x
3 + x + 6 with a modulus of P=11.Determine all of the points in E11(1,6)
[8M]
(b) For E11(1,6) , consider the point G=(2,7) Compute the multiples of G from
2G through 4G [8M]
4. (a) Explain in detail about Extended Euclid’s Algorithm.
(b) Using above algorithm find the multiplicative Inverse of 1234 mod 4321. [8+8]
5. (a) List requirements for a Hash Function.
(b) What basic arithmetical and logical functions are used in SHA-1? [6+10]
6. (a) What is R64 conversion?
(b) Why is R64 conversion useful for an e-mail application?
(c) Why is the segmentation and reassembly function in PGP needed? [4+6+6]
7. Write note on Encapsulating security payload. [16]
8. Write notes on
(a) Fire walls
(b) Trojan Horse Defense [8+8]
1 of 1
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