Tribhuvan University
Bachelor of Computer Application
Semester 8 · TU Board 2024
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 B
Attempt any SIX question.(6 × 5 = 30)
- 2.5
What is security services? Explain four fundamental security design principle. [1+4]
- 3.5
What do you mean by transportation cipher? Decrypt the cipher text UIESTNVRIY using the Rail fence cipher using rail size is 2. [2+3]
- 4.5
What is Euler's totient function? Find multiplicative inverse of 87 in Z₁₀₀ using Extended Euclidean algorithm. [1+4]
- 5.5
What is Abelian group? Find whether 561 is prime or not using Miller-Rabin algorithm. [2+3]
- 6.5
What is Password aging? Explain process of biometric authentication. [1+4]
- 7.5
What is malicious software? How worms are different from Trojan horses? [1+4]
- 8.5
What is security Audit? Explain the architecture of security auditing. [1+4]
Answer comingAlso asked in 2022
Group C
Attempt any TWO questions(2 × 10 = 20)
- 9.10
How key generation, encryption and decryption is done in RSA. In a RSA cryptosystem, given p=5 and q=19, determine private key, public key and perform encryption and decryption for the message m=4. [5+5]
- 10.10
Explain properties of hash functions. How hash value is generated using SHA-1 algorithm, explain with suitable diagram. [3+7]
Answer comingAlso asked in 2025
- 11.10
What is difference between Access Control List (ACL) and Access Control Matrix (ACM)? Explain five services provided by PGP protocol to secure email. [5+5]
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