Download DU (University of Delhi) B-Tech 7th Semester 1492 CS 702 Information Security Question Paper

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This question paper contains 4 printed pages]

(Write your Roll No. on the top immediately on receipt of this question paper.)

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Section A is compulsory.

Attempt any four questions from Section B.

Parts of a question must be answered together.

Section A

1. (a) List the different layers of an organization where security must be implemented to protect its operations. 3

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2. (b) Assume a hacker hacks into a network, copies a few files, defaces the Web page, and steals credit card numbers, how many different threat categories does this attack fall into ? 2
3. (c) What measures can individuals take to protect against shoulder surfing? 1
4. (d) Differentiate between Honeynet, Honeypot and Padded cell systems. 3
5. (e)
   1. (i) Define Generator and Parity Check Matrix.
   2. (ii) How can parity check matrix be used to generate codeword ?

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   3. (iii) Define minimum weight of the code. 2+2+1
6. (f) Describe linear block code. Explain the difference between hamming distance and hamming weight. 3
7. (g) Define congruence and compare with equality. 2
8. (h) Explain modulo operator along with its application. Also define residue classes with an example. 2

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9. (i) Explain whether the following cipher is monoalphabetic or not. Given reason also.
   Plain text: Frittata
   Ciphertext: LTOHHQJQ 2
10. (j) Use the Additive cipher to encrypt the message "HelloAbraham" with key = 10. 3
11. (k) Explain transposition cipher with a suitable example. 3

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12. (l) How many permutation tables are used in Data Encryption Standard cipher ? 2
13. (m) Differentiate between the following: 2+2
    1. (i) Digital Signature and conventional signature
    2. (ii) Public key and Private key.

Section B

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2. (a) Explain the steps of Diffie-Hellman Key exchange protocol. What is the most common attack on this protocol ? 5
3. (b) Assume a language with 8 letters: A, B, C, K, L, O, T, Y, where A is 0, B is 1, C is 2, K is 3, L is 4, O is 5, T is 6, Y is 7. In order to encrypt a word in this language, we convert the letters into binary form, apply the scheme shown in the diagram given below and convert them back to corresponding letters. Using the above algorithm, encrypt the word : KAL. 5
   

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