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Two common drawbacks of the visual cryptography scheme (VCS) are the large pixel expansion of each share image and the small contrast of the recovered secret image. In this paper, we propose a step construction to construct VCS<sub>OR</sub> and VCS<sub>XOR</sub> for general access structure by applying (2,2)-VCS recursively, where a participant may receive(More)
A (2,)-Visual Cryptography Scheme (VCS) is a kind of secret sharing scheme, where participants share a secret image, and any two of them can recover the secret image visually without any cryptographic knowledge and computation devices, but any one of them cannot get any information about the secret image other than the size of the secret image. This paper(More)