Questions
Syllabus
Qns. By Syllabus

Semester

Subject

Year

Tribhuwan University

Institute of Science and Technology

2079

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.
What is hash function? Describe how 128-bit of hash value is generated by taking an input message of variable size using MD5 algorithm?[10]
2.
Explain different ethical issues in computing? Explain RSA algorithm with suitable numerical example.[10]
3.
What is symmetric cryptography? Explain round operation of DES algorithm. Describe Sub-Key generation process for DES rounds.[10]
Section B

Short Answers Questions

Attempt any Eight questions.
[8*5=40]
4.
Define authentication. How Biometric information can be used for authentication? [5]
5.
What is access control? Explain attribute based access control with example. [5]
6.
Decrypt the cipher text "CRHG" using the Hill cipher with the key matrix .

$\begin{bmatrix} 3 & 4 \\ 3 & 5 \end{bmatrix}$
[5]
7.
What is security risk assessment? What are different aspects of a successful security risk assessment? [5]
8.
Differentiate between virus, worm and Trojan horse. [5]
9.
What is Security threat and attack? Describe different types of attacks in brief. [5]
10.
Explain Diffie Hellman Key Exchange Protocol with suitable example. [5]
11.
Define Euler Totient function. Determine whether 37 is Composite or not using Miller Rabin Primality testing. [5]
12.
Write Short Notes on: a. Phishing Attack b. Two Factor Authentication [5]