Tribhuvan University
Bachelor of Information Technology
Semester 5 · TU Board 2080
Course Title: Information Security (BIT303)
Full Marks: 60Pass Marks: 24Time: 3 hours
Candidates are required to give their answers in their own words as far as practicable.
Group A
Attempt any Two questions.(2 × 10 = 20)
- 1.10
Define Euler totient function with an example. Find the GCD of 12 and 32 using Extended Euclidean algorithm.
- 2.10
Describe the role of hash functions in authenticating message? How SHA - 1 algorithm is used to produce hash value of a message? Explain.
- 3.10
Distinguish between threats and attack. Discuss some computer security strategy. Assume a prime number 23 and 9 as its primitive root. Alice select a private key 5 and Bob select the private key 6. Now find the secret key value that Alice and Bob shared using Diffie - Hellman protocol.
Group B
Attempt any Eight questions(8 × 5 = 40)
- 4.5
Discuss about two factor authentication with an example.
Answer comingAlso asked in 2079
- 5.5
Explain the different types of access control principles.
- 6.5
Describe any two types of malicious software.
- 7.5
What is risk assessment? Describe the security auditing architecture.
- 8.5
Do cybercrime and computer crimes refers to same? Justify with relevant scenarios.
- 9.5
What do you mean by countermeasures for malwares? Discuss about audit trail analysis.
- 10.5
List some issues for user authentication. What is trust framework?
- 11.5
What is the role of digital signature in message authentication? List any two natures of zombies.
- 12.5
Write the algorithm for RSA key generation with encryption and decryption.
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