Gujarat Technological UniversitySummer 2026 examination

GTU 2170709 Information and Network Security (INS) Summer 2026 Question Paper & PDF

B.E. · Computer Engineering · Semester 7 · Subject code 2170709
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 2:30 PM – 5:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Define Confidentiality, Integrity and Avaibility
(b)
4 marks
Briefly explain any two active security attacks.
(c)
7 marks

Explain playfair cipher substitution technique in detail. Find out cipher text for the following given key and plaintext. Key=ENGINEERING, Plaintext=COMPUTER

Q.2

14 Marks
(a)
3 marks
Explain one time pad cipher with example.
(b)
4 marks
Explain columnar transposition Cipher technique.
(c)
7 marks

Explain single round of DES algorithm. Support your answer with neat sketches.

(c)
7 marks
Briefly describe Mix Columns and Add Round Key in AES algorithm.

Q.3

14 Marks
(a)
3 marks

State the differences between chosen plain text and chosen cipher text attack.

(b)
4 marks
Write a short note on Man-in-the-middle attack.
(c)
7 marks
Discuss Diffie-Hellman key exchange algorithm in detail.
(a)
3 marks
What is the purpose of the S-boxes in DES? Explain the avalanche effect.
(b)
4 marks

Encrypt the message "meet me at the usual place " using the Hill cipher with the key (9 4 5 7)

(c)
7 marks
Explain RSA algorithm in detail with suitable example.

Q.4

14 Marks
(a)
3 marks
Explain counter mode of DES operation.
(b)
4 marks
Explain public key cryptosystem with neat diagram.
(c)
7 marks
Explain the logic of SHA (Secure Hash Algorithm).
(a)
3 marks
Explain cipher feedback mode of DES operation.
(b)
4 marks
Explain key distribution process using Key Distribution Center (KDC).
(c)
7 marks

Write the algorithm for message authentication code (MACs) based on HASH functions.

Q.5

14 Marks
(a)
3 marks
Which types of security threats are faced by user while using the web?
(b)
4 marks
Explain MAC code generation using block cipher.
(c)
7 marks
Write a short note on “Digital Signature Algorithm”.
(a)
3 marks

What is defined by X.509 certificate? Write the process of authentication in X.509.

(b)
4 marks
Explain Difference between Asymmetric and Symmetric Key.
(c)
7 marks
Explain SSL architecture.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Information and Network Security (INS) (Summer 2026, B.E. · Computer Engineering, Sem 7). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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