A Novel Approach to Enhance Robustness in Steganography Using Multiple Watermark Embedding Algorithm
S. Praveen Kumar1, K. Anusha2, R.Venkata Ramana3

1S.Praveen Kumar, Department of Information Technology, GITAM University, Visakhapatnam, Andhra Pradesh, India.
2K.Anusha, Department of Information Technology, GITAM University, Visakhapatnam, Andhra Pradesh, India.
3R.Venkata Ramana, Department of Information Technology, GITAM University, Visakhapatnam, Andhra Pradesh, India.
Manuscript received on February 28, 2011. | Revised Manuscript received on March 02, 2011. | Manuscript published on March 05, 2011. | PP: 50-56 | Volume-1 Issue-1, March 2011. | Retrieval Number: A016021111
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: This paper deals with an enhanced technique that improves robustness in steganography. A multiple watermark embedding algorithm has been proposed to embed multiple text messages as watermarks simultaneously in the same watermark space while minimizing the watermark (distortion) energy. The watermark is embedded in the DCT coefficients of the green channel of the color image. The algorithm takes into account the perceptual capacity of each coefficient inside the DCT blocks before embedding the watermark information. Therefore, the first 16 low frequency coefficients (excluding the DC value) in the 8×8 DCT block was screened and the eight coefficients with the maximum magnitudes were selected for embedding. The algorithm used is blind and does not require the original image for extracting the watermark. The watermarking method is robust against JPEG compression, additive noise, cropping, scaling, low-pass and median filtering.
Keywords: Steganography, DCT, MWE, pseudo random bit sequence, pseudo random positive real numbers, zero –mean Gaussian with variance.