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Gujarat Technological UniversitySummer 2024 Examination

GTU 2170709 Information and Network Security (INS) Summer 2024 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)
List out active attacks. Using an example, describe any one attack.
3 Marks
(b)
With an example, describe the Railfence transposition technique.
4 Marks
(c)

Write down the steps required to convert plaintext to ciphertext using the Playfair cypher. Use the Playfair cypher algorithm to convert the given plaintext to ciphertext. PT: COMPUTATION, KEY: WORLD

7 Marks

Question 2

14 MarksMedium
(a)
Differentiate stream cipher and block cipher.
3 Marks
(b)
How powerful is DES? Discuss its strength in detail.
4 Marks
(c)
Discuss in detail: round function of DES.
7 Marks
OR OPTION
(c)
Discuss in detail: round function of AES.
7 Marks

Question 3

14 MarksMedium
(a)
Briefly explain Man-in-the-middle attack.
3 Marks
(b)

Use the Diffie-Hellman algorithm and solve the following example. q=23, α=5, XA=6, XB=4, YA=?, YB=?, Secret Key K=?

4 Marks
(c)

Explain encryption and decryption process of cipher feedback mode with diagram.

7 Marks
OR OPTION
(a)
Discuss Double DES.
3 Marks
(b)

Use the RSA algorithm and solve the following example. p=17, q=11, e=7, M=15, d=?, CT=?

4 Marks
(c)

Explain encryption and decryption process of output feedback mode with diagram.

7 Marks

Question 4

14 MarksMedium
(a)
What is digital signature? Discuss the attacks possible on digital signature.
3 Marks
(b)

Define MAC. Explain the concept of authentication and confidentiality using MAC.

4 Marks
(c)

Define simple Hash function and discuss the security requirements for Hash functions.

7 Marks
OR OPTION
(a)
Why message authentication is needed in security?
3 Marks
(b)

Why signing and verifying properties play important role in digital signature?

4 Marks
(c)
Discuss round function of SHA-512.
7 Marks

Question 5

14 MarksMedium
(a)
List out the requirements of Kerberos.
3 Marks
(b)
Explain public key authority with diagram.
4 Marks
(c)
What is secure shell? Explain it in detail.
7 Marks
OR OPTION
(a)
Define the following terms: KDC, TGS and TGT.
3 Marks
(b)
Explain public key certificates with diagram.
4 Marks
(c)
Define SSL. Explain SSL protocol stack in detail.
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 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.

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