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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. 3 Question paper
Code No: RR410504 Set No. 3
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 the various components of symmetric cipher model? Explain. [8M]
(b) Write short notes on crypto analysis. [8M]
2. (a) List the characteristics of advanced block ciphers. [8M]
(b) What are the differences between RC5 and RC2? [8M]
3. (a) What is a one-way function?
(b) What is trap-door one-way function?
(c) Describe in general terms an efficient procedure for picking a prime number?
[5+5+6]
4. Given 2 as a primitive root of 29, construct a table of indices, and use it to solve
the following congruences:
(a) 17x2
10 mod 29
(b) x2
-4x - 16 0 mod 29
(c) x7
17 mod 29 [5+5+6]
5. (a) What is the difference between weak and strong collision resistance?
(b) What is the role of a compression function in a hash function? [6+10]
6. Explain X.509 Authentication services [16]
7. (a) List and briefly define the parameters that define an SSL session state?
(b) List and briefly define the parameters that define an SSL session connection?
[8+8]
8. (a) what information used by a typical packet-filtering router?
(b) What are some weaknesses of a packet-filtering router?
(c) What is the difference between a packet-filtering router and a stateful inspec-
tion firewall? [8+4+4]
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