M.Sc. DEGREE EXAMINATION, NOVEMBER 2017
Third Semester
Computer Science
NETWORK SECURITY
(CBCS 2016 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. What are the two types of attacks?
2. How many rounds in DES?
3. What is the real crisis of RSA?
4. What is elliptic curve crypto system?
5. Differentiate between message integrity and message
authentication.
6. Define a cryptographic hash function.
7. Name any four types of packets used in PGP.
8. What is the difference between session and connection?
9. What are the two different modes of IPSec?
10. What is worm?
Sub. Code
551302
RW-983
2
Wk 10
Part B x 5 25)
Answer all questions choosing either or
11. Explain the need for security.
Or
Describe the blow fish algorithm.
12. Find an integer that has a remainder of 3 when
divided by 7 and 13, but is divisible by 12.
Or
What are the attacks mentioned for the Gamal
crypto system in the literature and explain.
13. Write a note on iterated hash function.
Or
Compare and contrast a conventional signature and
a digital signature.
14. How information needed for sending and receiving a
message in extracted from two key rings?
Or
List the services provided by SSL.
15. Write the steps in encapsulating security payload
protocol.
Or
Describe the different types of IDS technologies.
RW-983
3
Wk 10
Part C x 10 30)
Answer any three questions.
16. Describe the DES algorithm with an example.
17. List out the factorization methods and explain.
18. Describe the different categories of biometrics techniques.
19. Describe how master secret is created from pre-master
secret in TLS. Also explain how key materials are created
from master secrete in TLS.
20. Explain the working principle of circuit level firewalls.
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