Shared image generation apparatus and method, computer program, and computer readable storage medium

摘要

A shared image generation apparatus generates a basis matrix on the basis of a graph, the vertex set of which corresponds to a set of a plurality of members to which shared images are to be distributed, and generates a plurality of shared images to be distributed to the plurality of members on the basis of the basis matrix and an externally input secret image to be shared. The plurality of generated shared images form the secret image when they are stacked up.