STUPIDSID
Answer the following (Any Five)
1(a)
What are the measure of performances for lossy and lossless compression technique?
4 M
1(b)
Illustrate the worst cast in LZ-77 dictionary compression technique.
4 M
1(c)
What is 'frequency/auditory masking' temporal mashing' ?
4 M
1(d)
Which redundancies are exploited in JPEG lossy standard? Which are the process using these redundancies?
4 M
1(e)
State fermat's little theorem (FLT) and Euler's theorem. Illustrate with an examaple how FLT can be used to find modular inverse.
4 M
1(f)
Using modular arithmetic and theorems, prove that decrypted text is same as plain text in the RSA algorithm.
4 M
1(g)
What do you mean by 'confusion' and 'diffusion'? Which components are used in ciphers to introduce confusion and diffusion?
4 M
2(a)
generate a bunary tag using arithmetic coding technique for the sequence :
a b a c a b b
a b a c a b b
| symbol | count |
| a | 37 |
| b | 38 |
| c | 25 |
10 M
2(b)
perform LZW dictionary compression on the following text string : wabba-wabba-wabba-wabba-woo-woo-woo Initial dictionary: -
| Index | 1 | 2 | 3 | 4 | 5 |
| Entry | - | a | b | o | w |
10 M
3(a)
Explain Mp-III audio compression standard with a neat block diagram.
10 M
3(b)
What are different approaches for compressing an image? Explain JPEG-LS standard.
10 M
4(a)
Explain double DES and the need for it. Also explain the 'meet-in-the-middle' attack.
10 M
4(b)
Explain any one digital signature algorithm in detail.
10 M
5(a)
Encrypt the plain text 63 using RSA algorithm which uses prime numbers p=7 and q=11. The public key e=13. Verify that the decrypted text is same as the plain text.
10 M
5(b)
Alice chooses her private key x=3 and Bob chooses y=6. If both of them use the primitive root g=7 for prime p=23, what is the key exchanged between Alice and Bob using diffie-Hellman key exchange?
10 M
Write short notes on two
6(a)
Adaptive Huffman coding
10 M
6(b)
H.264 encoder-decoder
10 M
6(c)
Eliptic curve cryptography
10 M
6(d)
Intrusion detection system
10 M
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