B.C.A. (Three Year) DEGREE EXAMINATION, OCTOBER/NOVEMBER 2017.
End-Semester Examination
Fifth Semester
(Regular/Supplementary)
NETWORK SECURITY
2 C 5501
Time 3 Hours Max. Marks 70
PART — A
Answer any FIVE of the following questions. 4 20 Marks)
1. Explain OSI security Architecture.
2. What is Diffie-Hellman key exchange?
3. Explain Digital signature standard.
4. Explain about web security.
5. What are viruses?
6. What are authentication protocols?
7. What is PGP?
8. What are threats?
PART — B
Answer ALL the following questions. 10 50 Marks)
9. Explain about data encryption standard.
Or
Explain Block cipher design principles.
10. Explain about public key cryptography.
Or
Explain about RSA.

11. Explain about MD5 message digest algorithm.
Or
Explain about hash functions and their security.
12. Explain about authentication applications.
Or
Explain e-mail and IP security.
13. Explain about password management.
Or
Explain virus counter measures.
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