CRYPTOGRAPHIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a cryptographic recording medium which is capable of easily discriminating a drawing part and a background part of a restored image when decrypting a source image from two share images in spite of using a visual decryption type secret dispersion method.

SOLUTION: In a plurality of encrypted images produced by a visual decryption type secret dispersion method, white and black dot patterns are colored in colors different from each other and disposed on a transparent substrate. A restored image produced by superimposing the encrypted images is observed with different hues for a drawing part and a background part, thereby clearly discriminating a shape of the drawing part.

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