MCASemester 32025-26Cryptography And Network SecurityBMC011
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Cryptography And Network Security (BMC011) - AKTU Question Paper 2025-26

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 2025-26. 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:2025-26
University:AKTU / UPTU

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Questions Asked in 2025-26

Cryptography And Network Security (BMC011) — complete question paper · 70 marks · 3 Hours

Section AAttempt all q u e s t i o n s i n b r i e f . 02 x 7 = 14
  • a
    Define cryptanalysis and steganography with examples. CO
  • b
    What is the difference between stream cipher and block cipher? CO
  • c
    Explain Feistel structure in modern block ciphers. CO
  • d
    What is Fermat’s theorem? Give its application in cryptography. CO
  • e
    Define Message Authentication Code (MAC). CO
  • f
    Explain Diffie–Hellman key exchange. CO
  • g
    What is a firewall? Mention any two types of firewalls. CO
Section BAttempt any three o f t h e f o l l o w i n g : 07 x 3 = 21
  • a
    Explain classical encryption techniques: substitution and trans position ciphers with suitable examples. CO
  • b
    Describe the structure and working of Advanced Encryption Standard (AES). CO
  • c
    Explain SHA-1 hash algorithm and discuss its security limitations. CO
  • d
    Describe Kerberos authentication protocol with neat diagram. CO
  • e
    Explain SSL architecture and discuss the importance of digital certificates. CO
Section CAttempt any one p a r t o f t h e f o l l o w i n g : 07 x 1 = 07
  • a
    Discuss Shannon’s concepts of confusion and diffusion. How d o they enhance encryption security? Give examples from DES. CO
  • b
    Explain the working of Triple DE S with diagram. Compare it with DES in terms of security. CO
  • a
    Explain RSA algorithm with an example showing key generation , encryption, and decryption. CO
  • b
    Discuss discrete logarithm pr oblem (DLP). Why is it important for public- key cryptography? CO
  • a
    Describe the structure of digital signature and explain ElGa mal digital signature scheme in detail. CO
  • b
    What is a hash function? Explain birthday attack with an example. CO
  • a
    Explain symmetric key distribut ion techniques. Discuss Key D istribution Center (KDC) method. CO
  • b
    What is Public Key Infrastru cture (PKI)? Explain X.509 certi ficate structure. CO
  • a
    Explain the components of IP S ecurity (IPSec) architecture. Discuss AH and ESP in detail. CO
  • b
    What is intrusion detection? E xplain virus, worm, and Trojan w i t h suitable examples. CO

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.

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