Q.1
14 Marks(b)
Explain Caesar cipher algorithm with the help of example.
(c)
List and explain different mode of operation used for encryption and decryption.
Also asked in Winter 2025 Q1c
Gujarat Technological UniversitySummer 2024 examination
GTU 3170720 Information security (IS) Summer 2024 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
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13 of 25 questions on this paper were also asked in other years. Each is marked below with the years it appeared.See all 22 repeated 3170720 questions, most asked first
Q.2
14 Marks(a)
List use of public key cryptography
OR
(c)
List and explain possible attacks on DES.
Q.3
14 Marks(a)
List requirements of public key cryptography.
(b)
How same key can be calculated in diffi hellman key exchange algorithm.
Also asked in Winter 2025 Q2c, Summer 2025 Q3c OR
OR
(a)
Write Euclid algorithm.
(b)
Discuss security of diffi hellman key exchange algorithm.
(c)
Write down the algorithm used for calculation exponentiation efficiently. Also give example.
Also asked in Summer 2026 Q3c OR
Q.4
14 Marks(a)
What is authentication? How can we implement message authentication?
(b)
List and explain requirements of secure hash function
OR
(a)
Define weak collision resistance and strong collision resistance.
Also asked in Winter 2025 Q3b, Summer 2025 Q5a
(c)
Explain message authentication based on DES.
Q.5
14 Marks(a)
Define Mutual authentication with example.
(b)
How public key cryptography can be used for Digital signature? Explain.
Also asked in Summer 2026 Q5b OR
(c)
Draw and explain DSS approach for digital signature.
Also asked in Summer 2026 Q5a, Summer 2025 Q5c OR
OR
(a)
List and explain various key distribution approach of symmetric key cryptography.
Also asked in Summer 2026 Q5c, Summer 2025 Q5b OR
(b)
Discuss the security of digital signature.
(c)
What is replay attack? How can we avoid this attack using digital signature?
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
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About this paper
Official Gujarat Technological University (GTU) examination paper for Information security (IS) (Summer 2024, 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.