BSc CS Sem 5 March 2026 March 2026 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) What is an Active Attack in network security? Explain any three types of active attacks in detail
   • (b) What is Computer Security and discuss its objectives?
   • (c) Apply the Caesar cipher to encrypt “HELLO WORLD” with key 3 and decrypt it back to the original message
   • (d) Write a short note on AES
   • (e) Explain Monoalphabetic substitution with an example
   • (f) Differentiate between stream cipher and block cipher
4. Q2 Attempt ANY FOUR from the following: (20M)
   • (a) Describe how Public-Key Infrastructure (PKI) helps in secure communications?
   • (b) Write a short note on Kerberos
   • (c) What is HMAC? How it works?
   • (d) the Diffie-Hellman key exchange algorithm with an example a Digital Signature and describe how it works?
   • (f) Explain the various fields of an X.509 certificate
5. Q3 Attempt ANY FOUR from the following: (20M)
   • (a) Write a short note on packet filtering firewall
   • (b) Describe how PGP secures email messages and discuss its main features
   • (c) What is a DDoS attack? Explain its working and impact
   • (d) the different techniques of Intrusion Detection Systems
   • (e) Explain the key components of IPSec
   • (f) Describe the purpose and main features of the Secure Electronic Transaction
6. Q4 Attempt ANY FIVE from the following: (15M)
   • (a) What is SSL? Describe its working mechanism
   • (b) Differentiate between Cryptography and Steganography
   • (c) What is Virus? Describe different types of Viruses
   • (d) | Compare S/MIME and PGP in email security
   • (e) Discuss the role of firewalls in protecting organizational networks
   • (f) Define an intruder and intrusion

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