Importance

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Abstract

In one embodiment, predetermined information is added to an electronic ticket in such a manner that the information can be added to an original paper ticket obtained by outputting the electronic ticket to a paper medium, and cannot be added to a forged paper ticket obtained by copying the original paper ticket. Since the predetermined information can be extracted from the original paper ticket and cannot be extracted from the forged paper ticket, the originality of the paper ticket can be verified depending upon whether the predetermined information can be extracted from the paper ticket. The originality of a paper ticket can be verified at a higher precision by making the extracted predetermined information be authenticated. In another embodiment, predetermined information is added to an electronic ticket by using a key, or predetermined information enciphered by using a key is added to an electronic ticket. The predetermined information can be extracted from a paper ticket by using another key only by a particular user sharing this key. Not only the originality of a paper ticket but also the fairness of the owner of a paper ticket can be verified by judging whether the predetermined information can be extracted from the paper ticket. The originality of a paper ticket and the fairness of an owner can be verified at a higher precision by making the extracted predetermined information be authenticated.

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First Claim