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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