MCA (R+LE) 4th semester (Sessional (Minor I) Examination, April 2014)
Subject Name: Cryptography and Network Security
Duration: 1:30 hr.
Marks: 50
Section A
(Objective Type Questions) 5 questions of 2 mark each
Q1. Expand : Cryptanalysis is............
Max
10
Q2.The areas of cryptography and cryptanalysis is called ___________(Crypto,
cryptology,Cryptographic,cryptographic system)
Q3.State True or False : Enciphering is also called encryption .
Q4.Example of Stream cipher ________and Example of Block cipher ____________
Q5.Expand : Brute- force attack is.................
Section B
(Short Answer Type) 5 questions of 5 marks each (any 4)
Q1. Explain symmetric cipher model?
20
Q2. Explain steganography and its techniques?
Q3.What is block cipher and its design principles?
Q4. Explain ECB and CBC modes of operation?
Q5.What is TRANSPOSITION technique; explain with the help of example?
Section C
(Long Answer Type) 3 questions of 10 marks each (any 2)
Q1. Explain DES Standard and strength of DES?
Q2. plaintext - paymoremoney and the key is k = 17 17 5
21 18 21
2
2
19
find k-1 with the help of hill cipher?
Q3. Explain attack, its services and its security measures ?
20