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Ramp secret image sharing

1 National University of Defense Technology, Hefei 230037, China
2 Harbin University of Science and Technology, Harbin 150080, China

Special Issues: Information Multimedia Hiding & Forensics based on Intelligent Devices

Secret image sharing (SIS) belongs to but differs from secret sharing. In general, conventional (k,n) threshold SIS has the shortcoming of “all-or-nothing”. In this article, first we introduce ramp SIS definition. Then we propose a $(k_1,k_2,n)$ ramp SIS based on the Chinese remainder theorem (CRT). In the proposed scheme, on the one hand, when we collect any $k_1$ or more and less than $k_2$ shadows, the secret image will be disclosed in a progressive way. On the other hand, when we collect any $k_2$ or more shadows, the secret image will be disclosed losslessly. Furthermore, the disclosing method is only modular arithmetic, which can be used in some real-time applications. We give theoretical analyses and experiments to show the effectiveness of the proposed scheme.
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© 2019 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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