MCASemester 32024-25Cryptography Network SecurityKCA011
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Cryptography Network Security (KCA011) - AKTU Question Paper 2024-25

MCA · Semester 3 · Free PDF Download

This is the official AKTU Cryptography Network Security Previous Year Question Paper for MCA Semester 3, academic session 2024-25. 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:2024-25
University:AKTU / UPTU

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Questions Asked in 2024-25

Cryptography Network Security (KCA011) — extracted question text · 100 marks · 3 Hours

Section AAttempt all questions in brief. 2 x 10 = 20
  • a
    What is Cryptography? Explain types and features of Cryptography. 1 2
  • b
    Between symmetric and asymmetric encryption which method is more convenient and why?
  • c
    Define Model of network security. 1 2
  • d
    What are the three aspects of security? 1 2
  • e
    What is public key distribution? 4 4
  • f
    Define firewall design principles. 5 1
  • g
    What is Euler’s theorem? 3 1
  • h
    What is Birthday Attack? 3 2 i. Describe the terms Triple DES. 1 2 j. What do mean by steganography? How it differs from cryptography? 1 2
Section BAttempt any three of the following: 10 x 3 = 30
  • a
    Explain following components of encryption algorithm with examples
  • 2
    Encryption algorithm
  • 5
    Decryption algorithm
  • b
    Define Euler’s theorem and it’s application also Find gcd (24140, 16762), gcd (1970, 1066) using Euclid’s algorithm?
  • c
    Perform encryption and decryption using RSA Alg. For the following
  • d
    Explain the attacks related to Digital Signature. 4 4
  • e
    What is a message authentication code? What characteristics are needed in a secure hash function?
Section CAttempt any one part of the following: 10 x 1 = 10
  • a
    Explain in detail about DES and Triple DES. 1 2
  • b
    Explain the following terms :— i. Masquerading ii. Passive Attack iii. Stream Cipher. iv. Message Integrity v. Stenography
  • a
    Explain Fermat’s theorem. What is Euler’s totient? 2 4
  • b
    Describe the principle of differential cryptanalysis. 1 2
  • a
    Describe the Digital Signature Algorithm (DSA) of Digital Signature Standard. 4 4
  • b
    What are the requirements of a good hash and MAC? 3 2
  • a
    With DSS, if same message is signed at different occasions, the signatures of the message differ. Why? Explain with suitable example
  • b
    Explain the PGP message genera tion process. Why does PGP genera te
  • a
    signature before compression w hile message encryption is appl ied after compression ?
  • a
    Write short notes on any two of the following: —
  • a
    Pretty Good Privacy (PGP)
  • b
    What do you understand by digital certificate? What is a chain of certificates ? How is a X.509 certificate revoked ?

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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