Anna University of Technology Tirunelveli 2011 B.Tech Information Technology B.e/ s, /e- -university exam paper

B.E/B.TECH DEGREE exams MAY/JUNE-2011
REGULATIONS 2008
SIXTH SEMESTER
IT 62- CRYPTOGRAPHY AND NETWORK SECURITY
info TECHNOLOGY

TIME: 3 hours Maximum:100 marks

ans ALL ques.
PART-A(10*2=20 marks)

1. Distinguish passive attack from active attack.
2. State Euler theorem with example
3. What kinds of attacks are addressed by DES algorithm
4. How do you determine that a provided number is prime or not
5. What is Digital signature
6. describe Birthday attack.
7. elaborate the principal differences ranging from Kerberos version four and version 5.
8. What is MIME and S/MIME?
9. What is honey pot?
10. Write down the role of security standards


PART-B(5*16=80 MARKS)

11(a) List out and discuss various kinds of cryptanalytic attacks with suitable example.(16)
or

11(b)(i) discuss Classical crypto system with neat sketch(8)
(ii) describe and illustrate Chinese Remainder theorem and discuss how it is helpful in cryptography(8)

12(a) discuss in detail the transformations that take place in DES encryption and explain security of DES against different attacks.(16)

or

12(b)(i) Perform encryption/decryption using RSA algorithm for the subsequent P=3, q=11,e=7,m=5 (10)
(ii) Write notes on Triple DES(6)

13(a)(i) elaborate the properties that hash function must satisfy?(6)
(ii) discuss MD5 algorithm in detail(10)

or

(b)(i) Bring out the different steps involved in Diffie-Hellman key exchange.(8)
(ii) Illustrate digital signature algorithm(DSA) in detail(8)

14(a) Briefly define kerberos version 4.(16)

or

(b)(i) How does PGP protocol support E-mail security(8)
(ii) What protocols comprise SSL? discuss any 2 of them.(8)

15(a) Write short notes on
(i)Types of Intruders(8)
(ii) Malicious software (8)

or

b(i) discuss firewall design principles(8)
(ii) State and discuss various kinds of viruses(8)

Earning:   Approval pending.