Gujarat Technological UniversitySummer 2024 examination

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

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

Q.2

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

Q.3

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

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

(c)
7 marks

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

(a)
3 marks
Discuss Double DES.
(b)
4 marks

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

(c)
7 marks

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

Q.4

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

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

(c)
7 marks

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

(a)
3 marks
Why message authentication is needed in security?
(b)
4 marks

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

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

Q.5

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

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About this paper

Official Gujarat Technological University (GTU) examination paper 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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