BIT 5th Semester
Information Security Board Question Paper 2081

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BIT 303-2081 ✡
Tribhuvan University
Institute of Science and Technology
2081
✡
Bachelor Level/Third Year/Fifth Semester/Science
Bachelors in Information Technology (BIT 303)
(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 Answer Questions
Attempt any Two question.
[2x10=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?

2.

Discuss how encryption and decryption is done in the DES algorithm.

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?

Section B

Attempt any Eight questions

[8x5=40]
4.

How online and offline dictionary attacks are done in password based authentication systems?

5.

Describe the roles of relying parties, attribute providers and identity providers in Open Identity Trust Framework.

6.

Define zombies, rootkits and Trojans.

7.

Briefly describe the status of cyber law in Nepal.

8.

Discuss various methods of risk treatment during security risk analysis.

9.

What is the use of S-box in DES? Illustrate S-box operation with an example.

10.

How hash value is generated by the SHA-2 hash function.

11.

Write Rabin Miller Algorithm for primality testing. Test whether 341 is prime or not using the algorithm.

12.

Define interception, repudiation and incapacitation with examples.