Mr. Karwan Asaad Abdullah Profile

Karwan Asaad Abdullah

at Univ of Buckingham

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Proceedings Article | 15 May 2014 Paper

Effect of using different cover image quality to obtain robust selective embedding in steganography

Karwan Asaad Abdullah, Naseer Al-Jawad, Alan Anwer Abdulla

Proceedings Volume 9138, 913808 (2014) https://doi.org/10.1117/12.2052624

KEYWORDS: Image quality, Image filtering, Steganography, Gaussian filters, Image processing, Light sources and illumination, Digital filtering, Spatial filters, Databases, Statistical analysis

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One of the common types of steganography is to conceal an image as a secret message in another image which normally called a cover image; the resulting image is called a stego image. The aim of this paper is to investigate the effect of using different cover image quality, and also analyse the use of different bit-plane in term of robustness against well-known active attacks such as gamma, statistical filters, and linear spatial filters. The secret messages are embedded in higher bit-plane, i.e. in other than Least Significant Bit (LSB), in order to resist active attacks. The embedding process is performed in three major steps: First, the embedding algorithm is selectively identifying useful areas (blocks) for embedding based on its lighting condition. Second, is to nominate the most useful blocks for embedding based on their entropy and average. Third, is to select the right bit-plane for embedding. This kind of block selection made the embedding process scatters the secret message(s) randomly around the cover image. Different tests have been performed for selecting a proper block size and this is related to the nature of the used cover image. Our proposed method suggests a suitable embedding bit-plane as well as the right blocks for the embedding. Experimental results demonstrate that different image quality used for the cover images will have an effect when the stego image is attacked by different active attacks. Although the secret messages are embedded in higher bit-plane, but they cannot be recognised visually within the stegos image.

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