DISTANCE EDUCATION
M.Sc. (Software Engineering) Years Integrated) DEGREE
EXAMINATION, MAY 2017.
CRYPTOGRAPHY AND NETWORK SECURITY
Time Three hours Maximum 100 marks
SECTION A — × 8 40 marks)
Answer any FIVE questions.
1. What is network security? Give examples of security
services.
2. What do you mean by passive and active attacks? Discuss
with examples.
3. What is encryption? Discuss the types of attacks on
encrypted messages.
4. Write a short note on cipher block modes.
5. Suggest situations in which message authentication
without confidentiality is preferable.
6. What is public key encryption? Discuss on the
requirements for public-key cryptography.
7. What is PGP? Describe the various PGP services.
8. What is a virus? Write short note on the types of viruses.
Sub. Code
52
DE-747
2
Ws 5
SECTION B — × 15 60 marks)
Answer any FOUR questions.
9. Discuss on Internet standards and RFCs.
10. What is DES? Discuss on DES encryption
algorithm.
Write a note on TCP session hipacking.
11. Discuss on the following
Message authentication using a one-way hash
function
HMAC.
12. With examples discuss any one public-key cryptography
algorithm.
13. Write short note on X.509 authentication service.
14. Discuss on the following
Transport layer security
Dual signature.
15. What is a firewall? Explain the different types of
firewalls.