B.TechSemester 72024-25Cryptography And Network SecurityKCS074

Cryptography And Network Security (KCS074) - AKTU Question Paper 2024-25

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 2024-25. 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:2024-25

University:AKTU / UPTU

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Questions Asked in 2024-25

Cryptography And Network Security (KCS074) — extracted question text · 100 marks · 3 Hours

Section AAttempt all questions in brief. 2 x 10 = 20

a
Outline the key principles of security
b
Distinguish between active and passive attacks
c
Determine GCD of (1970, 1066) usi ng Euclid’s algorithm
e
Discuss Public Key Infrastructure (PKI)
f
Explain Birthday attack
g
Explain E-mail security
h
List out some functions of PGP. 4 K1 i. Differentiate transport and tunnel mode in IPsec. 5 K2 j. Distinguish between Logic B omb and Trojan Horse

Section BAttempt any three of the following: 10 x 3 = 20

a
Illustrate Substitution techni ques and Transposition techniq ues under classical encryption
b
Explain the Advanced Encrypti on Standard (AES) algorithm, providing
a
clear diagram that illustrates its architecture
c
Illustrate the idea of Digita l Signature for authentication. D i s c u s s signing & verifying process of D igital Signature Algorithm (DSA ) in detail with suitable steps
d
Explain the full-service Kerb eros environment. Determine the principal differences between version 4 and version 5 of Kerberos
e
Explain the concept of IP se curity. Explain the role of AH and ESP

Section CAttempt any one part of the following: 10 x 1 = 10

a
Illustrate the DES algorithm with the help of block diagram. List the strength of DES. Discuss the requirement of Double and Triple DES
b
Explain Vigenère cipher and en crypt the following message "Life is full of surprises” using the key – “HEALTH”
a
Compute the multiplicative i nverse of 11 mod 26. Also state the Extended Euclidian Algorithm
b
Apply Miller-Rabin primality te st to test the primality of t he number n=37. Write the pseudo code for Miller Rabin primality testing
a
Explain the concept of MAC. D iscuss the working of MAC with suitable block diagram
b
Discuss SHA- 512 with all required steps, round function &am p; block diagram
a
Determine the role of X.509 certificate in cryptography. Discuss X.509 certificate in detail
b
Illustrate the various servic es supported by S/MIME. Explain how S/MIME supports these services
a
Discuss the concept of dual signature in context of Secure E lectronic Transaction (SET). Briefly desc ribe the sequence of events tha t are required for a SET transaction
b
Discuss the difference betwee n SSL connection and SSL sessio n. Discuss SSL protocol architecture

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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