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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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Keywords secret image sharing; ramp secret image sharing; Chinese remainder theorem; progressiveness; lossless recovery

Citation: Xuehu Yan, Longlong Li, Lintao Liu, Yuliang Lu, Xianhua Song. Ramp secret image sharing. Mathematical Biosciences and Engineering, 2019, 16(5): 4433-4455. doi: 10.3934/mbe.2019221


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