No. of Printed Pages : 3

CST-303

ADIT / BIT PROGRAMME Term-End Examination December, 2011 O

oo

O

CST 303 : INFORMATION SYSTEM SECURITY -

Time : 3 hours

Maximum Marks : 75

Note : There are two Sections in this paper. All questions in Section A are Compulsory. Answer any three questions from Section B. SECTION - A 1. For each of the following statement, state whether 1x10=10 it is true or false : (a) RSA stands for Rivest Security Algorithm. (b) Kerberos is not a Security tool. (c) Virus appends itself to a file, therefore, it becomes easy to detect it. (d) Diffie - Hellman algorithm is used for key exchange. (e) Euler totient function is used in RSA algorithm. In Public key system encryption key and (f) decryption key are different. (g) Digital signature standard is an example of public cryptography system. • (h) DES encrypts blocks of 128 bits.

CST-303



1

P.T.O.

(i)

0

)

Firewalls provides no protection against external threats. X. 509 defines the standard for digital signature certificate.

2.

What do you understand by 'Authentication and 'Encryption' in the context of system security ? Explain.

10

3.

Discuss how kerberos protocol achieves authentication.

10

CST-303

2

SECTION - B 4.

(a) Describe how PGP is used to provide secure

10

e-mail communication. (b) Differentiate between active attacks and 5 passive attacks. 5.

(a) Describe the importance of digital signature

10

in banking and insurance sector. (b) Discuss the Caesar Cipher technique. 5 6.

Perform the encryption and decryption using

15

RSA algorithm for the following : P = 7, q =17, plain text input 'M' =19 and d = 77. p and q are two prime numbers. 7.

Write a brief note on each of the following : (a)

IP Sec

(b)

Substitution Cipher

(c)

Logic Bomb

(d) . Virus (e) SSL

CST-303

3

5x3=15

Information System Security.pdf

(e) Euler totient function is used in RSA. algorithm. (f) In Public key system ... Page 3 of 3. Main menu. Displaying Information System Security.pdf. Page 1 of 3.

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