Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV NETWORK SECURITY Previous Question Paper (July - 2019 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
A bank is performing all its financial transactions over the Internet. What kind of security is required?
Answer
Financial transactions over the Internet require end-to-end security, specifically incorporating confidentiality (encryption), integrity (digital signatures), authentication (digital certificates), and non-repudiation to ensure secure communication between the client and the bank's server.
Draw the common attacks and vulnerabilities.
Answer
Common attacks and vulnerabilities can be categorized as follows:
- Passive Attacks: Eavesdropping, traffic analysis.
- Active Attacks: Masquerade, replay, modification of messages, denial of service (DoS).
- Vulnerabilities: Software bugs, weak passwords, misconfiguration, and lack of encryption.
What is message authentication?
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Give a brief note on HMAC.
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What problem was Kerberos designed to address?
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How keys are generated in various cryptographic algorithms?
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Compare SSL and TLS.
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Write brief notes on SET.
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How does a trusted system defend from Trojan horse attack?
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What are the typical phases of operations of a virus or worm?
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Part B
How NIST defines computer security? Give examples of recent computer security attacks which you know.
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With the help of neat diagram, explain the model for Internetwork security.
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What are the different RFCs and Internet standards related to security? Logically organize them and explain their contribution.
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List and explain the Block Cipher Design Principles and Modes of operation.
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Write differences between Block & Stream ciphers.
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Explain Message Authentication Requirements and What are the attacks related to message communication?
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For SHA-512, show the equations for the values of W16, W17, W18, W19 and Calculate the hash function for the 48 letter message “ I leave 20 million dollars to my friendly cousin bill”.
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Mention three variations of digital signatures and briefly state the purpose of each.
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Define Kerberos and name its servers. Briefly explain the duties of each server.
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List and explain the PGP services and explain how PGP message generation is done with a neat diagram.
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What are the two levels of alerts? What action is taken by SSL when a fatal level is received? Explain.
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Explain in detail how payment processing is done in SET.
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Give a brief note on encapsulating security payload.
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What does it mean to say that a system is “trusted”? Do you agree that “only a trusted system can break your security”? Why or why not.
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Give a brief note on SNMPv1 Community facility and SNMPv3.
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Select any antivirus of your choice and explain it in detail.
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