Questions
Syllabus
Qns. By Syllabus

Semester

Subject

Year

Tribhuwan University

Institute of Science and Technology

2081

Bachelor Level / Third Year / Fifth Semester / Science

Bachelors in Information Technology (BIT303)

(Information Security)

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 Answers Questions

Attempt any TWO questions.
[2*10=20]
1.
Consider p=11 and q=7 in a RSA cryptosystem. i. What is a public key pair (e, n)? ii. What is a private key pair (d, n)? iii. What is ciphertext for M=6?[10]
2.
Discuss how encryption and decryption is done in the DES algorithm.[10]
3.
Define subjects, objects and access rights in access control with suitable examples. How role based access control is different from attribute based access control?[10]
Section B

Short Answers Questions

Attempt any Eight questions.
[8*5=40]
4.
How online and offline dictionary attacks are done in password based authentication systems? [5]
5.
Describe the roles of relying parties, attribute providers and identity providers in Open Identity Trust Framework. [5]
6.
Define zombies, rootkits and Trojans. [5]
7.
Briefly describe the status of cyber law in Nepal. [5]
8.
Discuss various methods of risk treatment during security risk analysis. [5]
9.
What is the use of S-box in DES? Illustrate S-box operation with an example. [5]
10.
How hash value is generated by the SHA-2 hash function. [5]
11.
Write Rabin Miller Algorithm for primality testing. Test whether 341 is prime or not using the algorithm. [5]
12.
Define interception, repudiation and incapacitation with examples. [5]