B.TechSemester 72021-22Cryptograpy Network SecurityKCS-074

Cryptograpy Network Security (KCS-074) - AKTU Question Paper 2021-22

B.Tech · Semester 7 · Free PDF Download

This is the official AKTU Cryptograpy Network Security Previous Year Question Paper for B.Tech Semester 7, academic session 2021-22. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech

Semester:Semester 7

Session:2021-22

University:AKTU / UPTU

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Questions Asked in 2021-22

Cryptograpy Network Security (KCS-074) — complete question paper

Section AAttempt all questions in brief. 2 x 10 = 20

a
What are the requirements of Encrypted Tunnels?
b
Why compression is done before encryption in PGP?
c
Find the value of ɸ(12)
e
Find gcd (1970, 1066)
f
Explain Transport Layer Security?
g
Explain IPSec ESP Format
h
What are the requirements of a good hash function? i. Differentiate between Substitution & Transposition Cipher? j.What do you mean by cryptanalysis?

Section BAttempt any three of the following: 10 x 3 = 30

a
In a public key system using RSA, you intercept the cipher t ext C=8 sent to a user whose public key is e=13, n=33. What is the plain text M?
b
Differentiate between monoalphabetic ciphers and polyalphabe tic ciphers and give one example for each
c
Explain Chinese Remainder Theorem (CRT) and find X for the g iven set of congruent equations using Chinese Remainder theorem X=1 mod 5 X=2 mod 7 X=3 mod 9 X=4 mod 11
d
Give the encryption/decryption procedures using Elliptic Curve Cryptography
e
Define Euler’s Totient Function. Prove that, ɸ(pq) = (p-1)(q -1), where p and q are prime numbers

Section CAttempt any one part of the following: 10 x 1 = 10

a
What is the most security-critical component of DES round fu nction? Give a brief description of this function. Write the pseudo code for Miller Rabin primality testing. Test whether 61 is prime or not using the same Miller Rabin test
a
Illustrate the working of SHA-1 algorithm with diagram b.Discuss the Message Authentication Codes. Also give the use o f Authentication requirements in MAC
a
Explain the sequence of steps used in Secure Socket Layer ha ndshake Protocol for establishing a new session. Draw a diagram which shows the acti on of Handshake Protocol
b
Discuss the stream cipher RC4 in detail
a
Explain the sequence of steps involved in the message genera tion and reception in Pretty Good Privacy (PGP) with block diagrams
b
Discuss the design of S-Box of AES. How it differs from the S-Boxes of DES
a
Write the Digital Signature Algorithm (DSA) of Digital Signa ture Standard. What is the implication if same K (secret pe r message) is used to sign two different message using DSA?
b
Define a Group and Ring. Prove that the order of any subgroup of finite group divides the order of the group

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

Repeated Questions — KCS-074

Questions that appeared in more than one session, found by comparing 4 years of Cryptograpy Network Security papers (2021-22, 2022-23, 2023-24, 2024-25)

Illustrate the working of SHA-1 algorithm with diagram b.Discuss the Message Authentication Codes. Also give the use o f Authentication requirements in MAC

Appeared in: 2021-22 · 2023-24

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