Cochin University of Science and Techology (CUST) 2006-8th Sem B.Tech Computer Science and Engineering (Supplementary) , tember , CS 801 Security In Computing - Question Paper

Time:

: 3 Hours

Maximum Marks

: 100

1.

()

Draw a block diagram representing model of conventional a)pto*yjteTL Explain all components.

(12)

(b>

Briefly define the Caesar Cipher.

OR

(S)

n

()

What is one-time pad? Explain using an example.

()

(b)

Explain the DES encryption algorithm.

(12)

iii.

Explain different types of software threats OR

(20)

IV

What are viruses? Explain various types of viruses.

(20)

V.

()

Explain memory and address protection schemes.

(10)

(b>

What itt ousted operating systems? Explain OR

(10)

VI.

()

Explain different types of file protect km mechanisms.

(10)

(b)

What is authentication? Explain user authentications schemes.

(10)

VII.

()

Describe security is multilevel databases.

(12)

(b)

What is 2 - phase update technique? What problem does it solve? OR

()

vin.

()

(b)

Outline different design techniques for multilevel secure databases Explain:

<i) Sensitive data (ii) Reliability (iti) Inference (iv) Integrity.

(12)

(*>

tx.

(*)

What ts a firewall? List techniques used by firewalls to control access and enforce a security policy.

(10)

(b)

What is an IDS system? Explain.

OR

(10)

X.

()

Describe various threats in networks.

(10)

(b)

What is a gateway? Explain application - level and circuit - level gateways.

(10)