Cochin University of Science and Techology (CUST) 2005-7th Sem B.Tech Information Technology ,ember , IT 705 (D) Cryptography And Data Security - Question Paper
IS. Tech Degree VII Semester Examination
November 2005
IT 705(D) CRYPTOGRAPHY AND DATA SECURITY (2002 Admissions o/t*ards)
Time: 3 Houn Maximum Mark* : 100
1. (a) Distinguish Cryptography ami Coding Theory. 10 (b) Explain the following terms in cryplography:
(i) Visual Cryptography (ii) Steganography 10
OR
2. (a) Explain the working of ilagelin Machine. 10 (b) Explain in detail, any probabilistic encryption method. 10
3. (a) What is secret sharing? Explain with an example. 08 (b) Explain in detail, the DES encryption. 12
OR
4. (a) Explain in detail, any stream ciphcr. Also explain Die uses of stream ciphers. 10 (b) Explain International Data Encryption Algorithm. 10
5. (a) Explain in detail. Ute most common purposes for which public key cryptography 12
has been opplied.
(b) Is there anything harm in decrypting arbitrary cipher text (encrypted using RSA 08 Algorithm) presented by an adversary? (Explain.
6. (a) Explain the role of the class NP hard problems in cryptography. 10 (b) Discuss the public key systems based on elliptic curves. 10
7. (a) Explain different cryptographic protocols. 10 (b) Discuss the applications pfZero-knowkdge proof techniques. 10
OR
8. (a) Explain the massage integrity with the aid of Hash functions. 10
(b) Explain what do you mean by bit commitment. 10
9. (a) Explain tlie general aspects of key management. 10
(b) Explain the criteria for a cryptosystem to be practical. 10
OR
10. (n) Whai doe network security mean? What arc the ways to cmpjoy Network security? 10
(b) Explain the Diflic-llahnpn key exchange system. 10
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| Earning: Approval pending. |
