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Visual cryptographic scheme (VCS) with multiple decryptions has the features of both OR-based VCS (OVCS) and XOR-based VCS (XVCS), which can be applied in wider applications. In this paper, a threshold VCS with the abilities of OR and XOR decryptions is proposed based on random grids (RG). If a copy machine is not available, the secret could be reconstructed by stacking. On the other hand, if a device...
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