MCASemester 32021-22Cryptography Network SecurityKCA-011
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Cryptography Network Security (KCA-011) - AKTU Question Paper 2021-22

MCA · Semester 3 · Free PDF Download

This is the official AKTU Cryptography Network Security Previous Year Question Paper for MCA Semester 3, academic session 2021-22. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:MCA
Semester:Semester 3
Session:2021-22
University:AKTU / UPTU

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Questions Asked in 2021-22

Cryptography Network Security (KCA-011) — extracted question text

Section AAttempt all q u e s t i o n s i n b r i e f .
  • a
    Differentiate block cipher and stream cipher. 2 1
  • b
    Differentiate substitution and transposition cipher. 2 1
  • c
    What is prime and relative prim e number in cryptography? 2 2
  • d
    Differentiate MAC and Hash. 2 3
  • e
    What do you mean by product cipher? 2 1
  • f
    Describe birthday attack. 2 4
  • g
    What do you mean by authentication? 2 3
  • h
    Which algorithm can be used to check message authenticity whet her it is changed or altered in between the communication. i. Why triple DES is used not double? 2 1 j. What do you mean by Email security? 2 5
Section BAttempt any three o f t h e f o l l o w i n g :
  • a
    What is Brute-Force attack? Explain with an example. 10 1, 2
  • b
    Solve the following equations
  • a
    Why can’t Bob choose 1 as the public key e?
  • b
    What is the problem in choosing 2 as the public key e?
  • d
    Distinguish between data-orig in authentication and entity authentication. Explain with the help of example
  • e
    What is DDoS? Explain with the help of example. 10 5
Section CAttempt any one p a r t o f t h e f o l l o w i n g :
  • a
    Describe criteria that are intended to increase confusion an d diffusion properties
  • b
    How many permutations are used in a DES cipher algorithm? Ho w many permutations are used in the round-key generator?
  • a
    In a RSA system, the public key of a given user is e=31, n=3 599. What is the private key of this user?
  • b
    Perform encryption and decrypt ion using the RSA algorithm, for any two of the following
  • c
    P=7; q=11; e=17; M=8
  • a
    Using fermat’s theorem, find 3201mod11. 10 2
  • b
    Compare and contrast features of SHA-512. 10 3
  • a
    Define the RSA digital signature scheme and compare it to th e RSA cryptosystem
  • b
    In the Diffie-Hellma n protocol, g = 7, p = 23, x = 3, and y = 5
  • a
    What is the value of the symmetric key?
  • b
    What is the value of R1 and R2
  • a
    What services are provided by IPSec? 10 5
  • b
    What is a firewall? Discuss its different types and possible configuration

Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.

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