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Gujarat Technological UniversitySummer 2026 Examination

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

B.E. · Computer Engineering · Semester 7 · Subject Code: 2170709
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Total Marks70 MarksExternal theory exam
Passing Marks23 Marks33% minimum cutoff
Exam Duration2.5 Hours2:30 PM – 5:00 PM
Paper Structure5 QuestionsWith internal OR choices
Jump toQ1Q2Q3Q4Q5

Question 1

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

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

7 Marks

Question 2

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

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

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

Question 3

14 MarksMedium
(a)

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

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

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

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

Question 4

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

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

7 Marks

Question 5

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

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

3 Marks
(b)
Explain Difference between Asymmetric and Symmetric Key.
4 Marks
(c)
Explain SSL architecture.
7 Marks
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About this Examination Paper & Attribution

Official Gujarat Technological University (GTU) examination paper and step-by-step solutions 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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