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Posted By: aravindsri Member Level: Gold Posted Date: 26 May 2008
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2007 Indira Gandhi National Open University (IGNOU) Diploma ADITM CST303 Information System Security June 2007 Question paper
IGNOU CST303 Information System Security June 2007
Advanced Diploma in Information Technology (ADIT) / Bachelor in Information Techology (BIT)
Term-End Examination
CST303 Information System Security
Time: 3 hours
Maximum Marks: 75
Note: There are two sections in this paper. Section A is compulsary. Answer any three questions from Section B.
SECTION A
1. Fill in the blanks with words or a set of words. (15)
(i) The principle of ___ ensures that only the sender and the intended recipients have access to the contents of a message.
(ii) A virus program is made in such a way that it is difficult to ___
(iii) ___ is the ultimate method to remove virus.
(iv) In ___ Brain virus marks affected sectors as bad sectors.
(v) DES encryts blocks of __ bits.
(vi) ___ is a person who attempts to break cryptography solutions.
(vii) A ___ binds a user with user's public key.
(viii) Conversion of plain text into cipher text is called as ___.
(ix) There are ___ rounds in DES.
(x) IPSec stands for ___
(xi) ___ is a security device that allows limited access into and out of one's network.
(xii) ___ defines the standard for Digital Signature Certificate.
(xiii) ___ is an Internet Mail Standard.
(xiv) Another name of an anti-virus is ___.
(xv) ___ is gaining access by being in close tandem to authorised user.
2. (i) Expand the following terms :
(a) DES
(b) SNMP
(c) IDEA
(d) MUX
(e) LFSR
(f) FTP
(g) PROM
(h) FAT
(i) SATAN
(j) HTTP
(ii) Define the following terms : (5)
(a) Symmetric cryptography
(b) Non-repudiation
SECTION B
Answer any thrce questions from this section.
3. (i) Describe in detail all steps in DES algorithm (10)
(ii) Discuss concept of Caesar Cipher. (5)
4. What do you understand by 'Authentication' and 'Encryption' in the context of system security? In this context explain (15)
(i) Kerberos
(ii) IP Security
(iii) RSA Encryption
5. Write short notes on each of the following: (15)
(a) Trojan Horse
(b) Smart Cards
(c) Physical threats and security
(d) PGP
(e) Logic Bomb
6. (i) Describe the importance of digital signature in banking and insurance sector (10)
(ii) What do you understand by 'brute force attack'? (5)
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