Tribhuvan University
Bachelor of Science in Computer Science and Information Technology
Semester 5 · Model question
Course Title: Cryptography (CSC316)
Full Marks: 60Pass Marks: 24Time: 3 hours
Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.
Group A
Attempt any TWO question.(2 × 10 = 20)
- 1.10
Define the CIA Triad and explain its components. List out the services of security. Differentiate between block ciphers and stream ciphers with examples.
- 2.10
Given p = 61, q = 53. Calculate the public key, private key, and encrypt the message "42". Then, decrypt the ciphertext to retrieve the original message.
- 3.10
Explain the single round operation in DES. Describe the F function in DES.
Group B
Attempt any EIGHT question.(8 × 5 = 40)
- 4.5
Explain the process of generating message digests using MD4.
- 5.5
Encrypt the message "INFORMATION" using the Playfair cipher with the keyword "SECURITY".
- 6.5
Explain the concept of digital signatures and differentiate between direct and arbitrated digital signatures.
- 7.5
Define firewall and types of firewalls.
- 8.5
State Fermat's theorem example. Write the algorithm forelse
- 9.5
Explain IP Security (IPSec) and its components.
- 10.5
Divide 3x^2+x+6 by 5x + 3 over GF(9).
Answer comingAlso asked in 2078
- 11.5
Explain the process of public key distribution and secret key distribution using public key cryptography.
- 12.5
Explain the concept of a denial of service attack and provide examples.
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