JNTU Kakinada B-Tech 4-1 CRYPTOGRAPHY AND NETWORK SECURITY R13 March 2018 Question Paper

IV B.Tech I Semester Supplementary Examinations, February/March – 2018
CRYPTOGRAPHY AND NETWORK SECURITY (Common to Computer Science and Engineering and Information Technology)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) What is meant by Fabrication? [3]
b) What are Confusion and Diffusion properties of Modern Ciphers? [4]
c) What is addition, multiplication and multiplicative and additive inverses modulo 8? [4]
d) What is one way property, weak and strong collision resistance? [4]
e) What is replay attack? What is the counter measure for it? [4]
f) Define Base Rate Fallacy. [3]

PART ?B (3×16 = 48 Marks)2. a) Enumerate the security mechanisms defined by X.800. Explain each. [8]
b) How are legitimate websites compromised with SQL injections, Malicious
Advertisements? Explain.
[8]

3. a) Which four tasks are performed in each round of AES Cipher? Explain. [12]
b) Explain the Key Expansion process in AES. [4]

4. a) How is GCD calculated with Euclid?s algorithm? Calculate the GCD of (270,
192)
[8]
b) Illustrate ElGamal Encryption and decryption algorithm. [8]

5. Illustrate Secure Hash algorithm in brief. [16]

6. a) Give an overview of Kerberos 4 dialogue. [8]
b) What are the environmental shortcomings of Kerberos4? How does Kerberos 5
address them?
[8]

7. a) How is Audit record analysis performed? [8]
b) How are security associations combined? [8]

Code No: RT41051
Set No. 1
R13
1 of 1