Information And Network Security (2170709)

BE | Semester 7 
  Winter - 2018|19/11/2019
Total Marks 70

Q1 (a) Differentiate block cipher and a stream cipher.

Q1 (b) Encrypt the Message “Surgical Strike” with key “GUJAR” using PLAYFAIR technique.

Q1 (c) Discuss in detail encryption and decryption process of DES.

Q2 (a) Distinguish between Symmetric encryption and Asymmetric encryption using suitable example

Q2 (b) Describe the term: Authentication, Authorization, Integrity and Non – repudiation

Q2 (c) Discuss in detail encryption and decryption process of AES.

OR

Q2 (c)

Encrypt the message "meet me at the usual place " using the Hill cipher with the key

9  4
5  7

Q3 (a) Explain Avalanche Effect

Q3 (b) Discuss Man in Middle Attack.

Q3 (c) Explain in detail RSA algorithm, highlighting its security aspect.

OR

Q3 (a) Explain the VERNAM Cypher method

Q3 (b) Explain the difference between diffusion and confusion

Q3 (c) Briefly explain Diffie Hellman Key exchange with an example.

Q4 (a) What is MAC ? How it useful in Crypto System.

Q4 (b) Briefly explain Digital Signature algorithm

Q4 (c) Described briefly the Authentication process covered by X.509

OR

Q4 (a) Discuss HASH function and its application in Crypto System

Q4 (b) Explain Different type of Attacks on Crypto System

Q4 (c) Explain PGP with its Authentication and Confidentiality Operation

Q5 (a) List out the various web security threats.

Q5 (b) What is meant by message digest? Give an example

Q5 (c) Discuss clearly Secure Hash Algorithm with its real time application.

OR

Q5 (a) Explain HAND SHAKE protocol in SSL.

Q5 (c) Explain digital signature schemes Elgamal and Schnorr.

Q5 (b) What is KDC? List the duties of a KDC.