Secret image sharing scheme with hierarchical threshold access structure |
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Affiliation: | 1. School of Computer Science and Technology, Hubei University of Technology, 430068, Wuhan, China;2. Department of Computer Science Electrical Engineering, University of Missouri- Kansas City, MO 64110, USA;3. Computer School, Central China Normal University, 430079, Wuhan, China |
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Abstract: | A hierarchical threshold secret image sharing (HTSIS) scheme is a method to share a secret image among a set of participants with different levels of authority. Recently, Guo et al. (2012) 22] proposed a HTSIS scheme based on steganography and Birkhoff interpolation. However, their scheme does not provide the required secrecy needed for HTSIS schemes so that some non-authorized subsets of participants are able to recover parts of the secret image. In this paper, we employ cellular automata and Birkhoff interpolation to propose a secure HTSIS scheme. In the new scheme, each authorized subset of participants is able to recover both the secret and cover images losslessly whereas non-authorized subsets obtain no information about the secret image. Moreover, participants are able to detect tampering of the recovered secret image. Experimental results show that the proposed scheme outperforms Guo et al.’s approach in terms of visual quality as well. |
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Keywords: | Cryptography Secret image sharing Hierarchical threshold access structure Cellular automata Birkhoff interpolation Information hiding Reversibility Tamper detection |
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