Hemchandracharya North Gujarat University Computer Security model question papers



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Posted Date: 29 Dec 2008      Posted By:: Darshak     Member Level: Silver  Points: 5 (₹ 1)

2004 Hemchandracharya North Gujarat University M.Sc Computer Science Computer Security Question paper



Course: M.Sc Computer Science   University/board: Hemchandracharya North Gujarat University





DF-1706 Seat No.__________
FOURTH YEAR (CA & IT) Examination
August – 2004
(406) EL – 02 : Computer Security


Time : 3 Hours] [Total Marks : 35


1. (a) Write any two :

( 1 ) What is computer security ? Briefly Explain personal security policy.
( 2 ) Discuss about security attacks defined by X.800.
( 3 ) Rule based intrusion detection.

(b) Write short notes on the following :

( 1 ) Honeyports
( 2 ) Circuit level gateway.

2. (a) Write any two :

( 1 ) What is salt in the context of UNIX password management?
( 2 ) What is digital immune system ?
( 3 ) What are the typical phases of operation of virus or warm ?

(b) Write short notes on the following :

( 1 ) Play fair cipher
( 2 ) Primitive operations used in RC5.

3. (a) Attempt any two :

( 1 ) List ways in which secret key can be distributed to two communicating parties. Also explain automatic key distribution for connection oriented protocol.
( 2 ) Explain RSA algorithm with example.
( 3 ) Briefly explain Diffie-Hellman key exchange.

(b) Attempt the following :

( 1 ) Briefly describe substitute byte and Add round key of AES.
( 2 ) Pictorially represent single round of DES algorithm.


4. (a) Attempt any two :

( 1 ) What is the difference between diffusion and confusion ? What is purpose of S-Boxes in DES ?
( 2 ) What is the difference between Link and End To End encryption ?
( 3 ) Briefly describe DSA.

(b) Attempt the following :

( 1 ) How does PGP use the concept of trust ?
( 2 ) Briefly describe ISAKMP header format.

5. (a) Attempt any two :

( 1 ) List ans Briefly define the principle categories of SET participants.
( 2 ) What are the security issues with an intranet and extranet ?
( 3 ) What are the four levels of voice privacy in wireless systems ?

(b) Attempt the following :

( 1 ) Discuss the issues of WAN security.
( 2 ) What is S/MIME ?













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