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An improved data hiding technique is proposed in this paper to hide the shares of a secret image in an Extended Visual Secret Sharing (EVSS) scheme. It is based on Least Significant Bit (LSB) substitution with a little modification that the embedding capacity varies with each pixel of the host image and depends upon the surrounding pixels' color difference. This not only increases the embedding capacity of the host image as compared to simple LSB substitution but also yields high Peak Signal to Noise Ratio (PSNR) values for host and stego images. Moreover, results indicate that the proposed data hiding process improves the security of camouflage images in EVSS schemes since shares are completely hidden in the cover images without any trace of their presence, unlike most of the previous share hiding approaches, thus preventing shares from alteration during transmission.

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An extended visual secret sharing scheme uses multiple innocentlooking cover images to hide a secret image such that none discloses any portion of the secret. In this article an extended secret sharing technique is proposed that shares a secret color image in a couple of significant images using a fixed pixel expansion factor of 9 for a color space as large as comprising 2 24 colors. Further more, the data hiding technique employed in this paper uses all three planes of a color image which reduces the number of cover images that would otherwise be needed. Recovery is performed through a simple stacking (XOR) operation and a sequence of random integers.