Q.1
14 Marks(a)
What are the key principles of security?
(b)
Differentiate between cryptography and steganography.
(c)
What is cryptanalysis? Explain 5 techniques of how attackers can launch attacks.
Gujarat Technological UniversitySummer 2025 examination
GTU 3170720 Information security (IS) Summer 2025 Question Paper & PDF
B.E. · Computer Engineering · Semester 7 · Subject code 3170720
- Total
- 70 marks
- To pass
- 23 marks (33%)
- Duration
- 2.5 Hours 2:30 PM – 5:00 PM
- Questions
- 5 with internal choice
No solutions on this paper yetNeed them for your exam? Ask once. Papers that students ask for are solved first, and we aim to add them within 24 hours.
Noted. This paper is in our queue now. Check back tomorrow.
We could not record that here. Email the paper name to hirenjsca@gmail.com and we will add it.
11 of 25 questions on this paper were also asked in other years. 1 more is a type of question GTU sets again with new data. Each is marked below with the years it appeared.See all 22 repeated 3170720 questions, most asked first
Q.2
14 Marks(a)
What would be the transformation of a message ‘Happy Birthday to you’ using Rail Fence technique level =3?
(b)
What is the idea behind meet-in-the-middle attack?
(c)
Explain the steps in the various rounds of DES.
Also asked in Summer 2026 Q2b, Winter 2025 Q3c OR, Summer 2024 Q2c
OR
(c)
Explain the steps in the various rounds of AES.
Q.3
14 Marks(a)
What is an Initialization Vector(IV)? What is its significance?
(b)
Generate a Cipher text for plain text ‘ACT’ with key ‘GYBNQKURP’ using hill cipher.
(c)
Explain RSA algorithm and also compute public key and private key of RSA with p- 53, q=59 and e = 3.
Also asked in Winter 2025 Q2c OR, Summer 2024 Q3c
OR
(b)
Generate a Cipher text for plain text ‘MISSION’ with key ‘IMPOSSIBLE’ using playfair cipher.
Also asked in Winter 2025 Q2b
(c)
Explain the Deffie Hellman key exchange algorithm in detail. In a Diffie Hellman Key Exchange, Alice and Bob have chosen prime value 11 and 7. If Alice’s secret key is 3 and Bob’s secret key is 6, what is the secret key they exchanged?
Also asked in Winter 2025 Q2c, Summer 2024 Q3b
Q.4
14 Marks(b)
Why is SHA more secure than MD5?
OR
(a)
What are the common causes for revoking a digital certificate?
(b)
What is the difference between MAC and message digest?
Q.5
14 Marks(a)
Explain the following properties of hash function
i)One way property
ii)Weak
collision resistance
Also asked in Winter 2025 Q3b, Summer 2024 Q4a OR
(b)
Name the four key steps in the creation of a digital certificate.
OR
(a)
What are the three aspects of a 3-factor authentication?
(b)
What is KDC? With the help of diagram explain how KDC do key distribution.
Also asked in Summer 2026 Q5c, Summer 2024 Q5a OR
More Information security papers
Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.
Other Semester 7 subjects
BE Computer
Preparing with friends?
Send this paper to your class group. Every question has its own link.
About this paper
Official Gujarat Technological University (GTU) examination paper for Information security (IS) (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.