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—Recently, Wang introduced a novel (2, n) region incrementing visual cryptographic scheme (RIVCS), which can gradually reconstruct secrets in a single image with multiple security levels. In RIVCS, the secret image is subdivided into multiple regions in such a way that any t shadow images, where 2 ≤ t ≤ n, can be used to reveal the (t − 1)th region.(More)
Many secure micropayment schemes have been proposed as the desire to support the low-value and the high-volume purchases of some e-commerce applications such as mobile commerce services or web-based interactive video services. However it seems that no one studies how to add the ability of returning changes in micropayment schemes. In this paper, we take the(More)