MCASemester 32023-24Cryptography Network SecurityKCA-011

Cryptography Network Security (KCA-011) - AKTU Question Paper 2023-24

MCA · Semester 3 · Free PDF Download

This is the official AKTU Cryptography Network Security Previous Year Question Paper for MCA Semester 3, academic session 2023-24. 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:2023-24

University:AKTU / UPTU

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Questions Asked in 2023-24

Cryptography Network Security (KCA-011) — complete question paper · 100 marks · 3 Hours

Section AAttempt all q u e s t i o n s i n b r i e f . 2 x 10 = 20

a
Differentiate Activ e and Passive attack. 2 1
b
State and prove Fermet’s theorem 2 1
c
What is the difference be tween Diffusion and Confusion? 2 2
d
Differentiate between weak collision resistance and strong col lision resistance property of hash function. 2 2
e
Differentiate Authorizat ion and authentication. 2 3
f
Show 2 is the primitive root of 11. 2 3
g
Between symmetric and asymmetric encryption which method is mo re convenient and why? 2 4
h
What is key distribution center? 2 4 i. What is the difference betwee n direct and arbitrated digital signature? 2 5 j. What do you understand by comput er viruses and worms? 2 5

Section BAttempt any three o f t h e f o l l o w i n g : 10 x 3 = 30

a
While DES keys are 64 bits long, but effective key length is only 56 bits, why? 10 1
b
Explain X.509 Authentication S ervice along with its format. 10 2
c
Describe DSA (Digital Signature Algorithm). 10 3
d
What basic arithmetical and l ogical functions are used in MD5? Explain SHA-1 logic. 10 4
e
What do you understand by web security? What are the secure socket layers and their functions? 10 5

Section CAttempt any one p a r t o f t h e f o l l o w i n g : 10 x 1 = 10

a
Describe network security model with neat and clean diagram. 10 1
b
Describe Block Cipher M odes of Operation in DES. 10 1
a
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)
b
In a public key system using RSA, if the Cipher text C = 20, public key e=5, n =35, what is the plain text corresponding to the Cipher text C? 10 2
a
What are the requirements for a Hash function? What is Birth day attack on Hash codes? What do you understand by Weak collision resistance and strong collision resistance?
b
Describe DSA (Digita l Signature Algorithm). 10 3
a
What do you mean by firewall? Explain Packet filtering, Circ uit gateways and Application gateways. 10 4
b
Compare DSS and RSA approaches to digital Signature. 10 4
a
What do you mean by Kerberos? Explain the role of Authentica tion Server (AS) and Ticket Granting Server (TGS) in Kerberos authentication Protocol
b
How is email security provide d through PGP? Also describe th e PGP message generation and PGP message reception 10 5

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 Network Security papers (2021-22, 2022-23, 2023-24, 2024-25)

Differentiate Activ e and Passive attack. 2 1

Appeared in: 2021-22 · 2023-24

Differentiate between weak collision resistance and strong col lision resistance property of hash function. 2 2