Question 1
(a)
List and explain different types of attacks.
3 Marks
(b)
Explain Caesar cipher algorithm with the help of example.
4 Marks
(c)
List and explain different mode of operation used for encryption and decryption.
7 Marks
Gujarat Technological UniversitySummer 2024 Examination
GTU 3170720 Information security (IS) Summer 2024 Paper Solution & PDF
B.E. · Computer Engineering · Semester 7 · Subject Code: 3170720
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
Question 2
(a)
List use of public key cryptography
3 Marks
(b)
Write steps for sub key generation in DES
4 Marks
(c)
Explain DES encryption.
7 Marks
OR OPTION
(c)
List and explain possible attacks on DES.
7 Marks
Question 3
(a)
List requirements of public key cryptography.
3 Marks
(b)
How same key can be calculated in diffi hellman key exchange algorithm.
4 Marks
(c)
Explain key generation of RSA algorithm
7 Marks
OR OPTION
(a)
Write Euclid algorithm.
3 Marks
(b)
Discuss security of diffi hellman key exchange algorithm.
4 Marks
(c)
Write down the algorithm used for calculation exponentiation efficiently. Also give example.
7 Marks
Question 4
(a)
What is authentication? How can we implement message authentication?
3 Marks
(b)
List and explain requirements of secure hash function
4 Marks
(c)
List basic uses of Hash function.
7 Marks
OR OPTION
(a)
Define weak collision resistance and strong collision resistance.
3 Marks
(b)
Draw message digest generation using SHA 512 algorithm.
4 Marks
(c)
Explain message authentication based on DES.
7 Marks
Question 5
(a)
Define Mutual authentication with example.
3 Marks
(b)
How public key cryptography can be used for Digital signature? Explain.
4 Marks
(c)
Draw and explain DSS approach for digital signature.
7 Marks
OR OPTION
(a)
List and explain various key distribution approach of symmetric key cryptography.
3 Marks
(b)
Discuss the security of digital signature.
4 Marks
(c)
What is replay attack? How can we avoid this attack using digital signature?
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 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.