| 摘要 |
PROBLEM TO BE SOLVED: To provide a password card capable of correct alignment, without having to depend on only the visual confirmation, when an original image is reproduced from among a plurality of shared images that use a visual cryptographic technique.SOLUTION: Embosses 20 are provided on a shared card (a) and a shared card (b), respectively, and in superimposing both the cards, alignment is executed by mating the embosses to enable correct alignment. Also, alignment can also be executed, by providing a spot-or line-like emboss on either of the cards and allowing the emboss to abut on an end surface of the other card. |
