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) — 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
    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. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

Repeated Questions — KCS074

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)

3x

Compute GCD (24120,1640) using Euclid’s algorithm. 2

Appeared in: 2022-23 · 2023-24 · 2024-25

3x

Explain birthday attack. 2

Appeared in: 2022-23 · 2023-24 · 2024-25

3x

Explain Digital Signature. Di scuss signing & verifying proce ss of Digital Signature Algorithm (DSA) in detail with suitable steps

Appeared in: 2022-23 · 2023-24 · 2024-25

3x

Explain Hash Function. Discuss SHA- 512 with all required st eps, round function with block diagram

Appeared in: 2022-23 · 2023-24 · 2024-25

2x

State and prove Fermat’s theorem. Use Fermat theorem to find a number ‘a’ between0 and 72 with a≡9794 mod 73

Appeared in: 2022-23 · 2023-24

2x

Discuss message authentication code (MAC).Also give the use of authentication requirement in MAC

Appeared in: 2021-22 · 2023-24

Cryptography And Network Security — Other Year Papers

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