JNTU Kakinada B-Tech 4-1 NETWORKS SECURITY AND CRYPTOGRAPHY (Electronics and Communication Engineering) R13 March 2018 Question Paper

IV B.Tech I Semester Supplementary Examinations, February/March – 2018
NETWORKS SECURITY AND CRYPTOGRAPHY (Electronics and Communication Engineering)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) Define Threat and Attack & What are the types of attacks on encrypted
message.
[4]
b) What is the block size in DES? What is the cipher key size in DES? What is
the round key size in DES?
[4]
c) Find the results of the following using Fermat?s theorem: (i) 5
15
mod 13 (ii) 15
18
mod 17
[4]
d) Define weak collision property of a hash function. [4]
e) Draw the general format for PGP message. [3]
f) List down the four phases of virus. [3]

PART ?B (3×16 = 48 Marks)2. a) Discuss the following:
i. ARP attacks, route table modification
ii. Buffer overflow & format string vulnerabilities

[8]
b) Explain the various types of cryptanalytic attacks. [8]

3. a) Explain the Key generation process in data encryption standard (DES)algorithm.
[8]
b) Explain the generation sub key and S Box from the given 32-bit key by
Blowfish.
[8]

4. a) Discuss clearly about fermat and Eluer?s theorem with example. [8]
b) Perform encryption and decryption using RSA Algorithm with the given P=5;
q=13; e=19; M=6.
[8]

5. a) Discuss clearly about the objectives of HMAC and it security features. [8]
b) Write and explain the digital signature algorithm. [8]

6. a) Explain how PGP provides authentication and confidentiality for email
services and for the transfer applications.
[8]
b) Discuss about the SSL architecture. [8]

7. a) Discuss about encapsulating security payload of IP. [8]
b) Explain the types of Host based intrusion detection. List any two IDS software
available.
[8]
Code No: RT4104E
Set No. 1
R13
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