Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV NETWORK SECURITY Previous Question Paper (May - 2019 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory (25 marks). Part B consists of 5 Units. Answer any one full question from each unit (10 marks each).
Part A
Assume a movie is transmitted over the Internet to registered users. What kind of security is required?
Answer
The primary security requirement is Access Control to ensure only registered users can view the content, and Content Confidentiality (typically via encryption) to prevent unauthorized redistribution or piracy of the digital media.
Consider a desktop publishing system used to produce documents for various organizations. Give an example of a type of publication for which confidentiality of the stored data is the most important requirement.
Answer
An example is a classified government report or a legal merger and acquisition document. In these cases, the disclosure of the information before the official release date could cause significant financial or political damage, making confidentiality the critical requirement.
What are the HMAC design objectives as per the RFC’s?
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List and explain the attacks related to message communication.
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Differentiate between Kerberos Version 4 and Version 5.
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List the applications of public key cryptography.
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Draw the SSL architecture.
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In SSL and TLS, why is there a separate change cipher spec protocol, rather than including a change_cipher_spec message in the handshake protocol?
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How to prevent false alarms in IDS?
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What are the typical phases of operations of a virus or worm?
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Part B
Draw a matrix that shows the relationship between security mechanisms and security services.
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Explain the UDP hijacking and man-in-the-middle attacks.
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Consider an Automated Teller Machine (ATM) in which users provide a Personal Identification Number (PIN) and a card for account access. Give examples of confidentiality, integrity, and availability requirements associated with the system and, in each case, indicate the degree of importance of the requirement.
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Compare and contrast substitution and transposition ciphers.
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Give a brief note on Conventional encryption algorithms.
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Explain the Secure Hash Function Algorithm in detail.
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Illustrate the digital signatures with a real time example and state its pros & cons.
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Discuss the X.509 certificate formats.
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Discuss the significance of key identifiers in a PGP Message and describe the five header fields in MIMIE.
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Explain IP security architecture and also explain basic combinations of security associations with a neat diagram.
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List the steps involved in the SSL record protocol transmission.
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What are the roles of the Oakley key determination protocol and ISAKMP in IPsec? Explain in detail.
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List and briefly define three classes of intruders.
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Where would you place a web server in an organization assuming that you can use a network firewall and why?
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Define Firewall. Explain its Characteristics, types, services and limitations.
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