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the TY BSC Information Technology, Network Security 2015, Semester 5 Question Paper for Mumbai University is as given below:

TY BSC Information Technology, Network Security 2015, Semester 5 Question Paper

N.B

All questions are compulsory.
Make suitable assumptions wherever necessary and state the assumptions made.
Answers to the same question must be written together.
Numbers to the right indicate marks.
Draw neat labeled diagrams wherever necessary.

1. Attempt any two of the following : [Marks:- 10]

Explain the concept of message digest.
Explain the concept of key rings with respect to PGP.
What is a firewall? List its advantages and disadvantages.
Write a short note on transposition sipher.

2. Attempt any three of the following : [Marks:- 15]

Write a short note on Rabin Cryptosystem.
Define cryptosystem. Explain the concept of a cryptosystem with the help of a communication channel.
Write a short note on public key cryptography.
Write a short note on RSA cryptosystem.
Explain the broad level steps in each of the 16 rounds of DES.
What is attack model? Explain different attack models on crptosystem.

3. Attempt any three of the following : [Marks:- 15]

What is digital signature? What is the importance of signature scheme?
Explain the concept of one-time signature.
Explain Diffie-Hellma key pre-distribution.
What is the key agreement?
Write a short note on fail-stop signature.
Explain the significance of extending Hash function.

4. Attempt any three of the following : [Marks:- 15]

Explain Network security model.
Describe OSI security architecture.
Describe CIA Triad of computer security.
List and explain the categories of security mechanism of X.800.
Explain the various security attacks.
Write a note on Non-Repudiation.

5. Attempt any three of the following : [Marks:- 15]

What are the components of PGP message format?
Explain the functions of Ticket Granting Server and Authentication Server in Kerberos.
What are the functions provided by S/MIME?
What is RFC 5322?
Explain internet mail architecture.
Write a short note on PKIX model.

6. Attempt any three of the following : [Marks:- 15]

What is the difference between tunnel mode and transport mode with respect to IPSec?
Why does ESP include a padding field?
What are the groups of IP Security document?
Explain the various participants in SET ( Secure Electronic Transaction ).
Describe security policy database.
Write a short note on SSL Record protocol.
What are the business requirements for secure payment processing with credit cards over the internet?

7. Attempt any three of the following : [Marks:- 15]

Write a short note on DDos.
What are different types of viruses?
What is the concept of Honeypot? Explain.
What is the intrusion detection system? Explain its benefits.
List and explain four techniques used to avoid guessable passwords.
Explain the three different configurations of firewalls.

8. Attempt any two of the following : [Marks:- 10]

a. List and explain various principle of security.
b. Encrypt the message “Come Home Tomorrow” using
Ceaser Cipher.
Simple columnar Transposition techniques with four columns. Order is 4, 2, 1, 3.
Explain with example Rail-Fence transposition technique.
Write the diffie-Hellman key exchange algorithm. Also give suitable example.

9. Attempt any two of the following : [Marks:- 10]

Explain the electronic Code Book and Cipher Feedback algorithm modes.
Explain with neat diagram working of DES algorithm.
Write the steps carried out for each round of IDEA.
Explain the working of RC4 algorithm.

10. Attempt any two of the following : [Marks:- 10]

Explain the concept of digital signature.
What is message digest? Explain with suitable example.
Explain the working of Secure Hash Algorithm.
Write the steps involved in RSA algorithm.

11. Attempt any two of the following : [Marks:- 10]

Write the steps to create a digital certificate.
Explain the concept of roaming certificate.
Differentiate between Simple Certification Protocol and Online Certificate Status Protocol.
List and Explain different categories types.

12. Attempt any two of the following : [Marks:- 10]

List Phases in Handshake protocol. Explain each in brief.
Differentiate between secured socket Layer and Transport Layer Security.
List various firewall configurations. Explain any two.
Write a short note on Virtual Private Network.

13. Attempt any two of the following : [Marks:- 10]

What do you mean in authentication Token? Explain how it works.
Explain how time based Token works.
How does certification-based Authentication work?
Explain the working of Kerberos.

14. Attempt any three of the following : [Marks:- 15]

List and explain different types of criminal attack.
Explain the subkey generation part of blowfish.
Explain Knapsack algorithm with suitable example.
Write and explain the PKIX services.
Explain types of electronic money based on the tracking of money.
What are the One-Way authentication approaches? Explain any two.