Abstract
Visual secret sharing (VSS) schemes are used to protect the visual secret by sending n transparencies to different participants so that k-1 or fewer of them have no information about the original image, but the image can be seen by stacking k or more transparencies. However, the revealed secret image of a conventional VSS scheme is just black and white. The colored k out of n VSS scheme sharing a colored image is first introduced by Verheul and Van Tilborg [1]. In this paper, a new construction for the colored VSS scheme is proposed. This scheme can be easily implemented on basis of a black & white VSS scheme and get much better block length than the Verheul-Van Tilborg scheme.
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