LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – COMPUTER SC.
SECOND SEMESTER – APRIL 2012
CS 2813 – CRYPTOGRAPHY & NETWORK SECURITY
Date : 21-04-2012 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
SECTION-A
ANSWER ALL THE QUESTIONS: (10 x 2 = 20)
- Write down the format of initial permutation of DES.
- Define substitution and Transposition Methods.
- Define prime number
- What is RC5-CTS mode?
- What is one way property of hash function?
- What are time stamps?
- What is S/MIME?
- What is handshake protocol?
- Write down the phases of Virus
- What is misfeasor?
SECTION-B
ANSWER ALL THE QUESTIONS: (5 x 8 =40)
- a) Explain Poly Alphabetic Cipher with an example
(OR)
- b) Explain Play fair Cipher technique with an example
- a) Explain RSA algorithm.
(OR)
- b) Explain the key distribution Scenario.
- a) Explain approaches of digital signature standard
(OR)
- b) Write down the requirements for a hash function.
- a) Explain MIME content types.
(OR)
- b) Explain SSL record protocol
- a) Explain rule based Intrusion Detection.
(OR)
b)Explain the password selection strategies.
SECTION-C
ANSWER ANY TWO QUESTIONS: (2 x 20 = 40)
- i) Explain Hill Cipher and find the cipher text of “POT” using
17 17 5 4 9 15
K= 21 18 21 and K-1 = 15 17 6
2 2 19 24 0 17
- ii) Explain RC5 algorithm in detail.
- i) Explain SHA algorithm in detail.
- ii) Explain IPSec Architecture in detail.
- i) Explain different types viruses.
- ii) Explain Digital Signature standard
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