B.Sc. (Computer Science) Sem 5 Information and Network Security Oct 2019 Question Paper - Mumbai University | munotes

Questions asked in this paper

• N.B. (1) All questions are compulsory. (2) Figures to the right indicate marks. (3) Illustrations, in-depth answers and diagrams will be appreciated. (4) Mixing of sub-questions is not allowed.

SECTION I - Q.1 (a) (Attempt All. Multiple Choice Questions) 5 Marks

1. (i) Message ____ means that the data must arrive at the receiver exactly as it is sent. Options: a. Access Control, b. Non repudiation, c. Masquerade, d. Integrity
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2. (ii) Which one of the following is passive attack? Options: a. Masquerade, b. Traffic analysis, c. Repudiation, d. Replay
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3. (iii) A firewall is specific form of ____. Options: a. router, b. bridge, c. Operating System, d. Architecture
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4. (iv) To sign a document digitally we need ____. Options: a. Sender's Private key, b. Sender's Public key, c. Receiver's Private key, d. Receiver's Public key
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5. (v) DES is an acronym for ____. Options: a. Data encryption Standard, b. Digital encryption Standard, c. Data encryption System, d. Double encryption Standard
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SECTION II - Q.1 (b) (Fill in the blanks from the pool: Message Digest, crossover, encrypted, Transport, asymmetric cryptography, mutation) 5 Marks

1. (i) For confidentiality, data to be sent is ____.
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2. (ii) A polymorphic virus undergoes ____.
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3. (iii) SHA-512 is a ____ algorithm.
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4. (iv) Digital signature uses ____ cryptography.
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5. (v) SSL is a ____ Layer protocol.
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SECTION III - Q.1 (c) (Short Answers) 5 Marks

1. (i) Define block cipher?
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2. (ii) What is Fiestel cipher?
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3. (iii) List out any two virus countermeasures.
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4. (iv) List out the functions used for rounds of AES?
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5. (v) Define Honeypot.
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SECTION IV - Q.2 (Attempt the following, Any THREE) 15 Marks

1. (a) List and explain different categories of security services.
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2. (b) Explain Vigenere cipher giving proper example.
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3. (c) Write an overview of DES algorithm.
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4. (d) Explain ECB model of operation of block cipher.
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5. (e) Explain Asymmetric cryptography with its application.
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6. (f) Define security attack. Explain its different types?
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SECTION V - Q.3 (Attempt the following, Any THREE) 15 Marks

1. (a) Differentiate between stream cipher and block cipher.
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2. (b) Discuss MAC in detail.
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3. (c) Explain digital signature process.
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4. (d) Discuss Diffie Hellman key exchange process.
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5. (e) Write a short note on Kerberos.
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6. (f) Explain the concept of Digital Certificate in detail.
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SECTION VI - Q.4 (Attempt the following, Any THREE) 15 Marks

1. (a) Explain PGP with different services offered by it.
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2. (b) Discuss SSL handshaking protocol in detail.
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3. (c) Define Intrusion. Explain different approaches of Intrusion detection.
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4. (d) Define malicious software. Explain different types of viruses.
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5. (e) Explain capabilities and limitations of firewall.
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6. (f) Explain Secure Electronic Transaction.
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SECTION VII - Q.5 (Attempt the following, Any THREE) 15 Marks

1. (a) Explain different aspects of Network security.
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2. (b) Explain different modes of operations of IPSec protocol.
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3. (c) Explain Man in middle attack.
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4. (d) Explain lifecycle of virus.
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5. (e) Encrypt NOTHING IS AS IT SEEMS and decrypt MKHSE LWYAE ATSOL using Rail Fence cipher.
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