Biju Patnaik University of Technology 2008 B.Tech Computer Science and Engineering COMPUTER SECURITY PECS 3406 - Question Paper

Eighth Semester Examination-2008
COMPUTER SECURITY
B.Tech PECS 3406
Full Marks – 70
Time: three Hours
ans ques. No. one which is compulsory and any 5 from the rest.
The figures in the right-hand margin indicate marks.
1. Answer the subsequent questions: [Marks two x 10]
a) Alice meets Bob and says BRXDUHP-BIULHDG using Caesar cipher, what does she want to convey?
b) The message let us go for coffee uses a simple transposition cipher with a key 24153. obtain the cipher text.
c) Differentiate ranging from confidentiality and integrity.
d) Discuss the info security model.
e) What is logic bomb?
f) Define web spoofing.
g) What is session hijacking?
h) Decrypt HWKSWXSLGNTCG using Vigener cipher with key Pascal.
i) Distinguish ranging from AES and DES encryption.
j) What is assurance in trusted OS?
2.
a) Define RSA Cryptosystem. Hence for cipher text C=10, public key e=5 and n=35, obtain the plain text. [Marks 5]
b) Discuss the security aspects of RSA. [Marks 5]
3.
a) What are the various possible computer crimes? [Marks 5]
b) How do the cyber criminal commit crimes? [Marks 5]
4.
a) Discuss various cyber laws. How intellectual property legal regulations is enforced to protect copyright violation. [Marks 5]
b) What are the differences ranging from admissible and inadmissible evidence? [Marks 5]
5.
a) What is Firewall? What kinds of firewalls are used and for what purpose? [Marks 5]
b) What DMZ stands for? How does it work? [Marks 5]
6.
a) Distinguish ranging from worms and viruses. [Marks 5]
b) Discuss the buffer overflow attack in programs. [Marks 5]
7.
a) State the steps for design of a trusted OS. [Marks 5]
b) What is database security? Hence explain multilevel database security. [Marks 5]
8. Write notes on: [Marks 5 x 2]
a) Ethical problems in computer security
b) Intrusion detection system.

Earning:   Approval pending.