B.TechSemester 72023-24Cryptography And Network SecurityKCS074
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Cryptography And Network Security (KCS074) - AKTU Question Paper 2023-24

B.Tech · Semester 7 · Free PDF Download

This is the official AKTU Cryptography And Network Security Previous Year Question Paper for B.Tech Semester 7, academic session 2023-24. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech
Semester:Semester 7
Session:2023-24
University:AKTU / UPTU

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Questions Asked in 2023-24

Cryptography And Network Security (KCS074) — extracted question text · 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
    Define steganography with example. 2
  • b
    Explain cryptanalysis. 2
  • c
    Compute GCD (24120,1640) using Euclid’s algorithm. 2
  • d
    Find all primitive roots of 13. 2
  • e
    Explain birthday attack. 2
  • f
    Write the services provi ded by digital signature. 2
  • g
    Define X.509 certificates. 2
  • h
    List the any four services provided by Pretty good privacy. 2 i. Discuss intrusion detection. 2 j. Explain firewall and its usage. 2
Section BAttempt any three o f t h e f o l l o w i n g :
  • a
    Discuss the working of DES in de tail with suitable diagram. 10
  • b
    Explain RSA algorithm with su itable steps. Let p= 17, q=11, e=7 and d=23. Calculate the public key & priva te key and show encryption and decryption for plain text M= 77 by using RSA algorithm
  • c
    Explain Digital Signature. Di scuss signing & verifying proce ss of Digital Signature Algorithm (DSA) in detail with suitable steps
  • d
    Discuss Diffie-Hellman key exc hange in detail with suitable diagram. 10
  • e
    Explain secure electronic tran saction (SET) protocol with suitable diagram. 10
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
    Discuss cryptography and its typ es with suitable example. 10
  • b
    Define block cipher. Also discuss any two block cipher modes of operation with advantages and disadvantages of each with block diagram
  • a
    State and prove Fermat’s theorem. Use Fermat theorem to find a number ‘a’ between0 and 72 with a≡9794 mod 73
  • b
    State Chinese remainder theorem (CRT). Solve the following c ongruent equations by CRT i. X=2 mod 3 ii. X=3 mod 5
  • a
    Discuss message authentication code (MAC).Also give the use of authentication requirement in MAC
  • b
    Explain Hash Function. Discuss SHA- 512 with all required st eps, round function with block diagram
  • a
    Explain Kerberos protocol for key distribution with suitable diagram. 10
  • b
    Discuss X.509 certificates in detail. Write the role of X.50 9 certificates in cryptography
  • a
    Discuss authentication header and encapsulating security pay load in detail with packet format
  • b
    Explain working of intrusion detection system (IDS) and its types with suitable diagram

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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