Download JNTUH MCA 4th Sem R15 2022 March-April 824AE Marchapril Information Security Question Paper

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Code No: 824AE

R15

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JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

MCA IV Semester Examinations, March/April - 2022

INFORMATION SECURITY

Time: 3 Hours Max.Marks:75

Answer any five questions

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All questions carry equal marks

1. a) Explain the operations, requirements and components of Network security model.
   b) Differentiate between Active Attacks and Passive Attacks. [8+7]
2. a) Use Playfair cipher with the key “COMPUTER” to encrypt the message “INFORMATION SECURITY”.
   b) Discuss about different poly-alphabetic cipher substitution techniques. [8+7]

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3. a) Explain cipher block modes of operations with suitable diagrams.
   b) Give the structure of AES. Explain how Encryption/Decryption is done in AES. [7+8]
4. a) Alice and Bob agreed to use RSA algorithm for the secret communication. Alice securely choose two primes, p=5 and q=11 and a secret key d=7. Find the corresponding public key. Bob uses this public key and sends a cipher text 18 to Alice. Find the plain text.
   b) Illustrate man in the middle attack on Diffie-Hellman key exchange algorithm. [8+7]
5. a) What are the Security Requirements of message authentication?
   

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   b) Discuss the various principles involved in private and public key cryptography. [8+7]
6. a) Explain the authentication procedures defined by X.509 certificate.
   b) What is Kerberos? What are the main features of Kerberos Version 5? [7+8]
7. a) How does PGP provide confidentiality and authentication service for e-mail and file storage applications? Draw the block diagram and explain its components.
   b) What are the services provided by IPSec? Where can be the IPSec located on a network? [8+7]

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8. a) Write briefly about the signature based Intrusion Detection Systems.
   b) Discuss about the various types of firewalls. [8+7]

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