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## Thursday, March 10, 2016

### IT2352 CRYPTOGRAPHY AND NETWORK SECURITY April May 2015

Anna University Questions - IT2352 / IT62 / 10144 IT 603 / 10144 CSE 46 CRYPTOGRAPHY AND NETWORK SECURITY, April may 2015, Computer Science and Engineering, Seventh Semester, Regulation 2008/2010

 Exam B.E/B.Tech. (Full Time) DEGREE END SEMESTER EXAMINATIONS Academic Year April May 2015 Subject Code IT2352 / IT62 / 10144 IT 603 / 10144 CSE 46 Subject Name Cryptography and Network Security Branch Computer Science and Engineering Semester Seventh Semester Regulation 2008/2010

B.E / B.Tech. (Full Time) DEGREE END SEMESTER EXAMINATIONS, APRIL / MAY 2015
Computer Science and Engineering
Seventh Semester
IT2352 / IT62 / 10144 IT 603 / 10144 CSE 46 CRYPTOGRAPHY AND NETWORK SECURITY
(Common to Information Technology)
(Regulations 2008/2010)
Time : 3 Hours                      Answer A L L Questions                Max. Marks 100
PART-A (10 x 2 = 20 Marks)

1. Differentiate between active attacks and passive attacks.
2. Find 117 mod 3.
3. Differentiate between stream ciphers and block ciphers.
4. State few applications of RC4 algorithm.
5. What is primitive root?
6. What is digital signature?
7. When are the certificates revoked in X.509?
8. What is tunnel mode in IP security?
9. Define worm.
10. What is the advantage of intrusion detection system over firewall?

Part-B (5* 16 = 80 Marks)

11. (a) Explain the substitution encryption techniques in detail. (16)
Or
(b) State and derive
(i) Fermat’s theorem. (8)
(ii) Euler’s theorem. (8)

12. (a) Explain Data Encryption Standard (DES) in detail. (16)
Or
(b) Explain the RSA algorithm in detail. For the given values, trace the sequence of calculations in RSA. p=7, q=13, e=5, and m=10. (16)

13. (a) Explain ElGamal public key cryptosystems with an example. (16)
Or
(b) Explain secure hash in detail. (16)

14. (a) Explain Kerberos Version 4 in detail. (16)
Or
(b) Explain Secure Socket Layer (SSL) in detail. (16)

15. (a) Write brief notes on the following;
(i) Classification of viruses. (8)
(ii) Worm Counter measures. (8)
Or
(b) Explain the characteristics and types of firewalls. (16)

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