Tribhuvan University
Bachelor of Computer Application
Semester 8 · TU Board 2023
Course Title: Information Security (CACS459)
Full Marks: 60Pass Marks: 24Time: 3 hours
Candidates are required to answer the question in their own words as far as possible.
Group A
Group B
Attempt any SIX question.(6 × 5 = 30)
- 2.5
What is security attack? Explain different type of active attack.
Answer comingAlso asked in 2025
- 3.5
Find the value of 7^2019 mod 11 by using Fermat's little theorem. Define Euler totient function with example.
- 4.5
What is Galois field? Divide 5x² + 4x + 6 by 2x + 1 over GF (7).
- 5.5
What is digital signature? Describe approaches of DSS.
- 6.5
What is firewall? Explain different type of firewall.
- 7.5
What are user authentication principles? Explain about Role based and Attribute based access control.
- 8.5
What is security audit trial? What are requirements for security auditing? Explain.
Group C
Attempt any TWO questions(2 × 10 = 20)
- 9.10
What is difference between block cipher and stream cipher? Encrypt and decrypt the message TRIBHUVAN UNIVERSITY with key BES using play fair and vernam cipher.
- 10.10
How does the Kerberos authentication works? Explain the concept of trust frameworks.
- 11.10
What is IPSec? What are benefits of IPSec? Explain the IPSec architecture in details.
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