B.TechSemester 72022-23Cryptography Network SecurityKCS074
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Cryptography Network Security (KCS074) - AKTU Question Paper 2022-23

B.Tech · Semester 7 · Free PDF Download

This is the official AKTU Cryptography Network Security Previous Year Question Paper for B.Tech Semester 7, academic session 2022-23. 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:2022-23
University:AKTU / UPTU

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Questions Asked in 2022-23

Cryptography Network Security (KCS074) — extracted question text

Section AAttempt all questions in brief. 2x10 = 20
  • a
    Explain Shannon Confusion and Diffusion
  • b
    Apply the Caesar Cipher(p=D( 3,C)) and Decrypt the cipher text “PHHW PH”
  • d
    Find gcd(1970,1066) usi ng Euclid’s algorithm
  • e
    What is Birthday attack?
  • f
    Explain role of compression function in hash function
  • h
    What are the services provided by the PGP? (i) Why does ESP include a padding field? (j) Mention four SSL protocol
Section BAttempt any three of the following: 10x3 = 30
  • a
    Explain the concept of block cipher and stream cipher in cr yptography. Discuss the modes of operations of block cipher
  • b
    What do you understand by Chi nese Remainder Th eorem? Solve the following congruent equations by Chinese remainder theorem: i. X ≡ 2 mod 3 ii. X ≡ 3 mod 5 iii. X ≡ 2 mod 7
  • c
    Why Message Authentication is required? Discuss working of MAC with suitable block diagram
  • d
    What is Digital Certificate? Give the format of X.509 certi ficate showing the important elements of the certificate. How is an X.509 certificate revoked?
  • e
    Explain the concept of dual signature in context of Secure Electronic Transaction(SET). Briefly describe the sequence of events that are required for a SET transaction
Section CAttempt any one part of the following: 10x1 = 10
  • a
    Explain Playfair technique a nd encrypt the following message "hide the gold in the treestump"' using the key - " playfair "
  • b
    Draw a block level diagram t o depict the signature of one round of DES. Prove that if plaintext block and encryption key are complemented then res ulting ciphertext block of DES encryption is also complemented
  • a
    Explain AES algorithm. What i s t h e d i f f e r e n c e b e t w e e n t h e AES encryption algorithm and the DES algorithm
  • b
    State and prove Fermat’s theo rem. Use Fermat theorem to fin d a number ‘a’ between0 and 72 with a≡9794 mod 73
  • a
    Explain Hash Function? Disc uss SHA- 512 with all required s teps, round function & block diagram
  • b
    Explain the idea of Digital Signature for the authenticatio n. Discuss signing & verifying process of Digital Si gnature Algorithm (DSA) in detai l with suitable steps
  • a
    Explain the full service of Kerberos environment. What are the principle differences between version 4 and version 5 of Kerberos?
  • b
    Describe how Diffie-Hellman algorithm used for key exchange is vulnerable to man in middle attack? Determine the shared secret key in a Diff ie-Hellman scheme with a common prime 71 and primitive root 7. Given the private keys of the communicating parties A and B are 5 and 12 respectively
  • a
    Describe RSA algorithm in de tail. Calculate the private key of A wherein RSA cryptosystem a particular A uses two prime numbers p = 13 and q =17 to generate her public and private keys. Let the public key of A is 35
  • b
    Explain the following: (i) Intrusion detection (ii) Firewall

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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