JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III CRYPTOGRAPHY AND NETWORK SECURITY Previous Question Paper (August/September - 2024 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Draw the model for Network Security.
Answer
The model consists of an information source, a transmitter, a secure channel (which includes a secret key), a receiver, and a destination. A trusted third party is often included to facilitate security services like key distribution or arbitration.
Give a brief note on Steganography.
Answer
Steganography is the art and science of hiding the existence of a message within another medium, such as an image, audio file, or text. Unlike cryptography, which renders a message unreadable, steganography conceals the message's presence entirely to prevent detection.
Differentiate between block cipher and Stream cipher.
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Discuss the concept of diffusion and confusion in block ciphers.
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What is a digital signature and why is it important in cryptography?
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What role do certificates play in the distribution of public keys?
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List and define the primary threats to web security.
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What enhancements does IEEE 802.11i bring to wireless LAN security?
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List the security services offered by Authentication Header.
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What is IKE, and what role does it play in IPsec implementation?
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Part B
Give the classification of attacks.
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Discuss the significance of key range and key size in cryptography. How do these factors affect the security and performance of cryptographic systems?
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Explain Polyalphabetic substitution cipher with an example.
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Compare and contrast symmetric and asymmetric key cryptography.
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What are the different modes of operation for block ciphers? Explain each in detail.
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Explain how the Diffie-Hellman key exchange works. Include a discussion of its security implications.
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In detail, explain the working secure hash algorithm (SHA-512).
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Describe the working mechanism of Kerberos V4. How does it ensure secure authentication in a network?
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Explain the need and operation of SSL protocol.
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Discuss strategies to enhance mobile device security in a corporate environment.
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Analyze the role of digital certificates in HTTPS. How do they contribute to the security of web communications?
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Explain how ESP provides confidentiality and integrity protection for IP packets.
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Mention the benefits of combining multiple security associations in IPsec communication.
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Explain how confidentiality and integrity are provided to an email by PGP.
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What is Single Sign-On (SSO), and how does it streamline authentication across multiple systems?
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