Digital Watermarking through Embedding of Encrypted and Arithmetically Compressed Data into Image using Variable-Length Key
Sabyasachi Samanta 1, Saurabh Dutta 2, Goutam Sanyal3
1Haldia Institute of Technology, Haldia, WB, INDIA
2Dr. B. C. Roy Engineering College, Durgapur, WB, INDIA
3National Institute of Technology, Durgapur, WB, INDIA,
Abstract:
In this paper, we have encrypted a text to an array of data bits through arithmetic coding technique. For this, we have assigned a unique range for both, a number of characters and groups using those. Using unique range we may assign range only 10 characters. If we want to encrypt a large number of characters, then every character has to assign a range with their group range of hundred, thousand and so on. Long textual message which have to encrypt, is subdivided into a number of groups with few characters. Then the group of characters is encrypted into floating point numbers concurrently to their group range by using arithmetic coding, where they are automatically compressed. Depending on key, the data bits from text are placed to some suitable nonlinear pixel and bit positions about the image. In the proposed technique, the key length and the number of characters for any encryption process is both variable.
Key words:
pixel, invisible digital watermarking, arithmetic coding, symmetric key, nonlinear function.
Original Souce Link : http://airccse.org/journal/nsa/0311nsa03.pdf
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