MCASemester 32022-23Cryptography And Network SecurityKCA-011

Cryptography And Network Security (KCA-011) - AKTU Question Paper 2022-23

MCA · Semester 3 · Free PDF Download

This is the official AKTU Cryptography And Network Security Previous Year Question Paper for MCA Semester 3, academic session 2022-23. 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:2022-23

University:AKTU / UPTU

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Questions Asked in 2022-23

Cryptography And Network Security (KCA-011) — complete question paper

Section AAttempt all questions in brief. 2x10 = 20

a
What are the drawbacks of pla cing the encryption function at application layer?
b
What is Avalanche effect? Explain in brief
c
Compute the value of Ф (41) where Ф is Euler Totient functi on
d
What are the drawbacks of m ono-alphabetic substitution cipher?
e
Differentiate bet ween weak collision resistance and strong collision resistance property of hash function
f
What are the Requirements for Public-Key Cryptography?
g
What do you mean by Reply Attack?
h
Define a hash function (i) What do you mean by a Trusted System (j) What is a virus? Describe WORM, Trojan horse

Section BAttempt any three of the following: 10x3 = 30

a
Describe Block Cipher Modes Of Operation in DES
b
State the Chinese Remainder Theorem. Hence use it to solve following Congruence to obtain the value of X. x≡2 (mod 3); X≡3 (mod 5); X≡2 (mod 7)
c
What are the possible ways s ymmetric keys can be distributed? Describe a key distribution scenario between users A, B and KDC. Assume that users A and B share a unique master key with KDC
d
What is Kerberos? Explain the role of Authentication Server (AS) and Ticket Granting Server (TGS) in Kerberos authentication Protocol
e
Write down short notes on any two of following: -- (i) Secure Electronic Transaction (SET) (ii) Firewall (iii) Secure Socket Layer (SSL) (iv) HTTPS

Section CAttempt any one part of the following: 10x1 = 10

a
What do you understand by network security attacks? Describ e active and passive securit y attacks
b
Explain triple DES encryptio n and Decryption? Explain the term meet-in-the middle attack
a
For a Deffie-Hellman scheme with common prime q = 11, and primitive root  = 2, generate a set of public key and private key pairs between two users A and B. Make your own assumptions
b
Explain the term traffic confidentiality with suitable example
a
What do you understand by message authentication code? How it differs from one way hash function?
b
Describe DSA (Digita l Signature Algorithm)
a
What is Pretty Good privacy (PGP)? Give the structure of Pretty Good privacy? Also explain the concept of key rings with their formats
b
What are the major security aspects in the security of elec tronic mail system
a
What services does IPSec provide? What is the difference be tween transport mode and tunnel mode?
b
What are the important features of Oakley Key exchange algorithm used for key exchange in the context of IPsec? What are the improvements in Oakley algorithm over Diffie Hellman Key exchange algorithm?

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 — KCA-011

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

Differentiate bet ween weak collision resistance and strong collision resistance property of hash function