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Gujarat Technological UniversitySummer 2025 Examination

GTU 2170709 Information and Network Security (INS) Summer 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 Hours2:30 PM – 5:00 PM
Paper Structure5 QuestionsWith internal OR choices
Jump toQ1Q2Q3Q4Q5

Question 1

14 MarksMedium
(a)
Define: Confidentiality, Integrity and Availability.
3 Marks
(b)
Discuss Confusion and Diffusion in cryptography with appropriate example.

State its purposes.

4 Marks
(c)

Explain Playfair cipher technique in detail. Find cipher text for plain text ‘MYSECRETMSG’ using ‘STARS’ as key.

7 Marks

Question 2

14 MarksMedium
(a)
Explain the steps of key generation in Advanced Encryption Standard.
3 Marks
(b)

Compare and contrast symmetric key cryptography and asymmetric key cryptography.

4 Marks
(c)

Draw a detailed block diagram of decryption process in DES. Add appropriate description.

7 Marks
OR OPTION
(c)

Draw a detailed block diagram of decryption process in AES. Add appropriate description.

7 Marks

Question 3

14 MarksMedium
(a)
Briefly explain Electronic Code Book mode for block ciphers.
3 Marks
(b)
Explain the working of public key cryptosystem with neat diagram.
4 Marks
(c)

Assuming two primes p=5 and q=11, calculate all the values of RSA. Assume other values appropriately.

7 Marks
OR OPTION
(a)
State the differences between birthday attack and brute force attack.
3 Marks
(b)
Write a short note on Meet-in-the-middle attack.
4 Marks
(c)

Assuming other values appropriately, calculate all the values for Diffie- Hellman key exchange, consider two primes q=23 and a=11.

7 Marks

Question 4

14 MarksMedium
(a)
Enlist various web security threats. Explain any one in brief.
3 Marks
(b)
Explain how Man-in-the-middle attack is carried out.
4 Marks
(c)

Define message authentication code and its characteristics. Discuss MAC based on any standard block cipher.

7 Marks
OR OPTION
(a)

Enlist and explain any one in detail, different ways for distribution of public keys?

3 Marks
(b)

Explain authentication and confidentiality services provided in Pretty Good Privacy.

4 Marks
(c)

Justify the characteristics needed for a hash function. Explain Secure Hash Algorithm-1 in brief.

7 Marks

Question 5

14 MarksMedium
(a)
Draw X.509 certificate format neatly.
3 Marks
(b)
Explain the use of TGT in Kerberose.
4 Marks
(c)
Write a detailed note on SSL architecture and protocol.
7 Marks
OR OPTION
(a)
Draw SSL Architecture neatly.
3 Marks
(b)

Explain key distribution process using Key Distribution Center (KDC).

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) (Summer 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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