DATA COMPRESSION AND ENCRYPTION (DCE) MAY 2012 [ELECTIVE] ELECTRONICS AND TELECOMMUNICATION SEMESTER 7
(3 Hours) [Total Marks : 100]
N.B. : (1) Question No. 1 is Compulsory.
(2) Attempt any four questions out of remaining six questions.
(3) Assume suitable data if needed.
(4) Figures to be right indicates full marks.
| 1. (a) | Brief explain Modelling and coding with respect to data compression. | 5 |
| (b) | Explain the principle of Public Key Cryptography. | 5 |
| (c) | Explain the working principle of Arithmatic Coding with suitable example. | 5 |
| (d) | Expalin Chinese remainder theorem. | 5 |
2. (a) | Define the following terms :- | 10 |
| (i) Compression Ratio | ||
| (ii) Distrotion | ||
| (iii) Compression Rate | ||
| (iv) Fidelity and Quality | ||
| (v) Self information. | ||
| (b) | Explain Diffie - Hellman key exchange algorithm with example. | 10 |
3. (a) | What is adaptive dictionary based coding. Explain any one method. | 10 |
| (b) | What is the signifiance of 'prime number' is public key cryptography ? Explain | 10 |
| RSA algorithm with a suitable example. | ||
4. (a) | Explain DPCM and ADPCM techniques used in audio compression. | 10 |
| (b) | What is Malicious Programe ? Explain different types of malicious programmes. | 10 |
5. (a) | Explain audio encoder and decoder used in MPEG. | 10 |
| (b) | Explain Digital Immune System. | 10 |
6. (a) | Design Huffman code for a source which generate letters from an alphabet. | 10 |
 Also calculate entrophy of the source. | ||
| (b) | What is message digiest ? Explain HMAC algorithm. | 10 |
7. | Write short notes on any two :- | 20 |
| (a) JPEG 2000 | ||
| (b) Key Distribution Centre | ||
| (c) Fire wall Design | ||
| (d) Difference between :- | ||
| (i) Lossy and Lossless compression | ||
| (ii) Audio Compression and Image Compression. |
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