Abstract
An extended visual cryptography scheme (EVCS) is a category of visual cryptography scheme (VCS) in which secret image is encoded into multiple shares of meaningful images. It has two additional images which are covering shares by the end of the encoding process. These meaningful shares are created by different approaches. The purpose of cover images (meaningful images) is to hide the secret image under it. In this paper, we propose an extended visual cryptography scheme with cover images using halftoning method. The halftoning method we designed for conversion of gray level image into binary image is based on dithering. The obtained halftoned image is transformed into multiple shares that are distributed to the participants. These shares are finally covered with some cover images to obtain meaningful shares. The experimental results and analysis show that the proposed scheme has satisfactory results.
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Abhishek Mishra, Ashutosh Gupta (2016). Extended Visual Secret Sharing with Cover Images Using Halftoning. In: Satapathy, S., Bhatt, Y., Joshi, A., Mishra, D. (eds) Proceedings of the International Congress on Information and Communication Technology. Advances in Intelligent Systems and Computing, vol 438. Springer, Singapore. https://doi.org/10.1007/978-981-10-0767-5_10
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DOI: https://doi.org/10.1007/978-981-10-0767-5_10
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