LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – COMPUTER SC.

SECOND SEMESTER – APRIL 2011

CS 2813 – CRYPTOGRAPHY & NETWORK SECURITY

 

 

Date : 12-04-2011             Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

SECTION-A

 

ANSWER ALL THE QUESTIONS:                                                                        (10 x 2 = 20)

 

1. Write down the difference between services and mechanisms
2. What is the functionality of X.800
3. What are the characteristics of a random number?
4. Write down the categories of public key Cryptosystems.
5. List out the message authentication functions
6. What are birthday attacks?
7. What are the parts of the signature compound?
8. What are the components of private key ring?
9. What are honey pots?
10. What is Zombie?

 

 

SECTION-B

 

 

ANSWER ALL THE QUESTIONS:                                                                              (5 x 8 =40)

 

11. a) Explain cryptographic systems and cryptanalysis

(OR)

1. b) Explain OSI security architecture

 

12. a) What is meet in the middle attack and how it is resolved?

(OR)

1. b) Write down the requirements of Cryptography.

 

13. a) Explain authentication requirements

(OR)

1. b) Explain Message authentication code.

 

14.a) Write down the applications of IPSec.

(OR)

1. b) Explain SSL architecture.
2. a) Explain Intrusion Techniques.

(OR)

Explain password protection methods

 

 

SECTION-C

 

ANSWER ANY TWO QUESTIONS:                                                      (2 x 20 = 40)

16. i)) Explain the modes of operation of Block Cipher

ii)Explain RC5 algorithm

 

17. i) Explain Diffie- Hellman Key exchange algorithm
18. ii) Explain Digital Signature in Secured Electronic Transaction.

 

18. i) Explain different types of Firewalls.

ii)Explain Simplified DES in Detail.

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

M.Sc. DEGREE EXAMINATION – COMPUTER SC.

SECOND SEMESTER – APRIL 2012

CS 2813 – CRYPTOGRAPHY & NETWORK SECURITY

 

 

Date : 21-04-2012             Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

                                                                 

SECTION-A

 

ANSWER ALL THE QUESTIONS:                                                                       (10 x 2 = 20)

 

1. Write down the format of initial permutation of DES.
2. Define substitution and Transposition Methods.
3. Define prime number
4. What is RC5-CTS mode?
5. What is one way property of hash function?
6. What are time stamps?
7. What is S/MIME?
8. What is handshake protocol?
9. Write down the phases of Virus
10. What is misfeasor?

SECTION-B

 

ANSWER ALL THE QUESTIONS:                                                                                 (5 x 8 =40)

 

11. a) Explain Poly Alphabetic Cipher with an example

(OR)

1. b) Explain Play fair Cipher technique with an example
2. a) Explain RSA algorithm.

(OR)

1. b) Explain the key distribution Scenario.
2. a) Explain approaches of digital signature standard

(OR)

1. b) Write down the requirements for a hash function.
2. a) Explain MIME content types.

(OR)

1. b) Explain SSL record protocol
2. a) Explain rule based Intrusion Detection.

(OR)

b)Explain the password selection strategies.

 

 

 

 

 

SECTION-C

 

ANSWER ANY TWO QUESTIONS:                                                                             (2 x 20 = 40)

 

16. i) Explain Hill Cipher and find the cipher text of “POT” using

 

17  17   5                             4    9   15

K=    21  18  21     and K^-1   =     15   17   6

2    2    19                           24   0  17

 

1. ii) Explain RC5 algorithm in detail.

 

17. i) Explain SHA algorithm in detail.
18. ii) Explain IPSec Architecture in detail.

 

18. i) Explain different types viruses.
19. ii) Explain Digital Signature standard

 

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