PROBLEM TO BE SOLVED: To provide a secret sharing scheme of character information and a printed matter used for this.;SOLUTION: In the visual secret sharing scheme of character information, imaged character information is shared to two invisible shared images to be encrypted, and the two encrypted shared images are overlapped each other to allow reconstruction of the character information. This visual secret sharing scheme includes a stage of setting one shared image as two-dimensional code and determining a used two-dimensional code type, a stage of preparing the two-dimensional code including the character information, a stage of setting the two-dimensional code including the character information as the first shared image, and preparing a shared image including the imaged character information from the first shared to set it as the second shared image, a stage of forming at least one of the first shared image and the second shared image on a transparent base material, and a stage of reconstructing the character information by the image by overlapping the first shared image and the second shared image.;COPYRIGHT: (C)2011,JPO&INPIT
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