Andhra University 2003 M.Sc Computer Science Cryptography - Question Paper

M.Sc. DEGREE exam 31 Oct 2003
Second Year - 3rd Semester Computer Science

Elective - Cryptography

Time: 3 hours
Maximum: 75 marks

First ques. is compulsory.
ans any 4 from the remaining ques..
All ques. carry equal marks.
Write all bits of the 1st ques. at 1 place.

1.
a. What is encryption?
b. What is decryption?
c. What is web?
d. What is Non-repudiation?
e. What is public key?
f. What is private key?

2. define Mono alphabetic substitution methods.

3. define modern encryption techniques DES and Triple DES

4. elaborate digital signatures and discuss the approaches for digital signatures based on public key encryption

5. define confidentiality using conventional encryption

6. define Block cipher modes of operation

7. define authentication protocols and applications

8. Write short notes on the following: a. MAC algorithm
b. RSA algorithm

Earning:   Approval pending.