BSc CS Sem 5 2023 2024 2024 INFORMATION & NETWORK SECURITY Question Paper - Mumbai University | munotes

Questions asked in this paper

• 2) Figures to the right indicate marks

1. Q3 Illustrations, in-depth answers and diagrams will be appreciated
2. Q4 Mixing of sub-questions is not allowed
3. Q1 Attempt ANY FOUR from the following: (20M)
   • (a) Define computer security. What are the objectives of computer security?
   • (b) What is an active attack in security? State various types of active attacks
   • (c) Write a note on Steganography
   • (d) Encrypt the following message using Rail Fence Algorithm with key size = 4 Plaintext = they are attacking from the north
   • (e) Explain Electronic Code Book(ECB) mode in cryptography
   • (f) Differentiate substitution and transposition techniques
4. Q2 Attempt ANY FOUR from the following: (20M)
   • (a) Write a note on public key cryptosystem
   • (b) Describe X.509 certificate format
   • (c) Assume Alice and Bob wish to communicate secretly. Compute the shared
   • (d) How does HMAC algorithm work?
   • (e) Discuss the concept of a digital signature. Explain its types
   • (f) Explain kerberos processing in detail
5. Q3 Attempt ANY FOUR from the following: (20M)
   • (a) What is a firewall? State and explain various types of firewall
   • (b) Explain the importance of web security
   • (c) What is S/MIME (Secure/Multipurpose Internet Mail Extensions)? Define its
   • (d) Describe IP security architecture
   • (e) State and explain any 5 types of virus
   • (f) Write a note on honeypots
6. Q4 Attempt ANY FIVE from the following: (15M)
   • (a) Define terms :
   • i. Cryptanalysis
   • (b) What is message authentication code?
   • (c) State any two common forms of malicious code
   • (d) Using Caesar cipher with key size = 3, encrypt the message “hide the gold and
   • (e) What are the three properties of Hash function?
   • (f) Explain the life cycle of viruses

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