BSc CS Sem 5 November 2024 November 2024 Information & Network Security Question Paper - Mumbai University | munotes

Questions asked in this paper

• 2) Figures to the right indicate marks

1. Q3 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) Differentiate between substitution technique and transposition technique in Briefly define categories of security mechanism and explain steps involved in RSA Algorithm
   • (d) Using a simple columnar transposition cipher, encrypt the given plaintext message
   • (e) What are the components of simple symmetric cipher model? Explain with suitable
   • (f) Describe the Feistel Structure of encryption & decryption
4. Q2 Attempt ANY FOUR from the following: (20M) Define message authentication. are the requirements of message Describe X.509 certificate format with suitable diagram What is the purpose of the Secure Hash Algorithm (SHA) in cryptographic applications? Explain how variants of SHA differ from one another? Explain the two of Digital Signature
   • (e) Write a note on Kerberos
   • (f) Alice and Bob want to securely communicate using Diffie-Hellman Key Exchange method. Given the following Prime numberp = 5, : Calculate Alice's public key, Bob's public key. And also compute the shared secret key using the public keys Attempt ANY FOUR from the following: (20M)
   • (a) How does Pretty Good Privacy(PGP) encryption work? Describe Secure Electronic Transaction(SET) a short note on Secure/Multipurpose Internet Mail Extensions (S/MIME)
   • (d) .~Explain IP security architecture Define virus. State and explain any four types of viruses
   • (f) Intrusion Detection System(IDS)? State and explain different types of IDS
5. Q4 Attempt ANY FIVE from the following: (15M) Explain any two active attacks with suitable illusration
   • (c) What is packet filtering firewall?
   • (d) does Electronic Code Book (ECB) encryption mode operate?
   • (e) Explain three charcteristics of hash function
   • (f) Define the role

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