CSIT 5th Semester
Cryptography Board Question Paper 2082

CSC 327-2082 ✡
Tribhuvan University
Institute of Science and Technology
2082
✡
Bachelor Level/Third Year/Fifth Semester/Science
Computer Science Information Technology (CSC 327)
(Cryptography)
(Old Course)
Full Marks:60 Pass Marks:24 Time:3 hours

Candidates are required to give their answers in their own words as for as practicable.
The figures in the margin indicate full marks

Section A
Long Answer Questions
Attempt any Two question.
[2x10=20]
1.

Make a comparison between parameters of SHA family. Explain about digital signature standards.

2.

What do you mean by X.509 certificate? Differentiate between SSL and TLS. Explain about PGP.

3.

Explain one way and mutual authentication with example. Describe the types of intruders.

Section B

Attempt any Eight questions

[8x5=40]
4.

Define policy and mechanism. Encrypt the message "GENERATIVEAI" taking 3 as shift key.

5.

Write the encryption and decryption process in double DES. List the properties of field.

6.

What is primality test? Test whether 3 is primitive root of 7 or not.

7.

Describe about different passes in MD4.

8.

Explain about vigenere and vernam cipher with example.

9.

Find the multiplicative inverse of 5 in Z_11 using Extended Euclidean algorithm.

10.

Define co - prime numbers. Discuss about Euler's totient function with an example.

11.

Explain in brief about AES encryption process.

12.

Define active and passive attack. Write the algorithm for Diffie - Hellman key exchange protocol.