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Based on correlative matrices set and random permutation, a new construction of rotation visual cryptography scheme (RVCS) has been presented, which can be used to encode four secret images into two shares. Experimental results demonstrate that four secrets can be recovered clearly by stacking two shares with different angles and the shapes of the reconstructed images do not have distortions.
To solve the problem of cheating in the reconstructing process of visual cryptography, a verifiable visual cryptography was proposed by adding a verifier to common visual cryptography scheme (VCS). This scheme can be used in any access structure and can check every share to prevent attackers from spoiling and grabbing the secret information.
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