Model Paper
First Question is Compulsory
Answer any four from the remaining
Answer all parts of any Question at one place.
Time: 3 Hrs. Max. Marks: 70
1. a) What is a digital signature?
b) What is denial service attack?
c) What is ECB mode?
d) What is the procedure for key generation using RSA?
e) What is the purpose and the use of a KDC?
f) What is non-repudiation?
g) What is session key?
2. a) Describe the Diffie - Hellman key excha nge algorithm and explain it with an
example.
b)Alice and Bob want to establish a secret key using the Diffie – Hellman key
exchange protocol using n = 11, g = 5, x = 2 and y = 3. Find the values A and B and
the secret key.
3. Describe the data encryption a lgorithm.
4. a) What are the key requirements of message digests?
b) Describe the secure hash algorithm.
5. Discuss the message formats of Kerberos V4 in detail.
6. a) What is password based encryption? What are the problems associated
with it?
b) What is AH? Explain.
7. Discuss SSL in detail?
8. Describe Pretty Good Privacy.
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