Gujarat Technological UniversitySummer 2025 examination

GTU 2170709 Information and Network Security (INS) Summer 2025 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 Availability.
(b)
4 marks
Discuss Confusion and Diffusion in cryptography with appropriate example.

State its purposes.

(c)
7 marks

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

Q.2

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

Compare and contrast symmetric key cryptography and asymmetric key cryptography.

(c)
7 marks

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

(c)
7 marks

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

Q.3

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

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

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

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

Q.4

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

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

(a)
3 marks

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

(b)
4 marks

Explain authentication and confidentiality services provided in Pretty Good Privacy.

(c)
7 marks

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

Q.5

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

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

(c)
7 marks
Explain digital signature schemes Elgamal and Schnorr.

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About this paper

Official Gujarat Technological University (GTU) examination paper 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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