| 摘要 |
An authenticating device authenticates a user by using an authenticating card having holes formed at positions unique to the user and has the following sections (A) to (C). (A) A random image creating section for creating a condition-meeting random image meeting the condition that at least one set of color unit images of the same color are present at positions corresponding to two holes when the authenticating card is placed over the images of colors randomly arranged. (B) A matching section for judging whether or not the color represented by answer information of the user is one of the colors of at least the one set of color unit images doubly viewed through the two holes of the authenticating card when the authenticating card is placed over eth condition-meeting random image (condition (b)). (C) An authentication judging section for judging that the user is successfully authenticated when the matching section repeats judgment repetition times RN meeting condition (c) mentioned below and judges that the color represented by the answer information meets condition (b) at all the repeated judgments. Condition (c): RN meets the condition that (G<SUB>1</SUB>/CNx . . . x(G<SUB>RN</SUB>/CN) is a predetermined value or less where CN is the number of different colors, and Gi is the number of sets of color unit images of the same color present at two holes when the authenticating card is placed over the condition-meeting random image at the i-th judgment.
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