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Gujarat Technological UniversityWinter 2025 Examination

GTU 2170709 Information and Network Security (INS) Winter 2025 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 Hours10:30 AM – 1:00 PM
Paper Structure5 QuestionsWith internal OR choices
Jump toQ1Q2Q3Q4Q5

Question 1

14 MarksMedium
(a)
Explain data confidentiality, data authentication and data integrity.
3 Marks
(b)

Differentiate symmetric and asymmetric key cryptography. Draw the design model of symmetric key cryptography.

4 Marks
(c)
Explain play fair cipher with example.
7 Marks

Question 2

14 MarksMedium
(a)

Compare and contrast symmetric key cryptography and asymmetric key cryptography.

3 Marks
(b)
Explain columnar transposition Cipher technique.
4 Marks
(c)
Describe various steps of AES
7 Marks
OR OPTION
(c)
Write a short note on DES
7 Marks

Question 3

14 MarksMedium
(a)
How meet in the middle attack is performed on double DES?
3 Marks
(b)
Explain public key cryptosystem with neat diagram
4 Marks
(c)
Explain authentication mechanism of Kerberos
7 Marks
OR OPTION
(a)

What is the difference between weak and strong collision resistance? Consider the hash functions based on cipher block chaining, What kind of attack can occur on this?

3 Marks
(b)

Explain Cipher Block Chaining (CBC) and Electronic Code Book (ECB) block cipher modes of operation with the help of diagram.

4 Marks
(c)
Explain encryption and decryption using RSA with example.
7 Marks

Question 4

14 MarksMedium
(a)
Explain digital public key certificate format.
3 Marks
(b)
Write a short note on Man-in-the-middle attack
4 Marks
(c)
Explain the logic of SHA(Secure Hash Algorithm).
7 Marks
OR OPTION
(a)
Why HASH function is required in cryptography?
3 Marks
(b)
Explain various public key distribution techniques
4 Marks
(c)
Briefly explain Diffie-Hellman key exchange with example.
7 Marks

Question 5

14 MarksMedium
(a)
Define the parameters that define SSL session state and session connection.
3 Marks
(b)
What is defined by X.509 certificate? Write the process of authentication in X.509.
4 Marks
(c)
Explain SSL architecture
7 Marks
OR OPTION
(a)
Explain MAC code generation using block cipher
3 Marks
(b)

What problem was Kerberos designed to address? What are the three threats associated with user authentication over a network or Internet?

4 Marks
(c)
Explain digital signature schemes Elgamal and Schnorr
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) (Winter 2025, 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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