| 摘要 |
A digital signature device includes an operation unit configured to accept key information that specifies target information of digital signature from a user and to accept the digital signature from the user, a control unit configured to extract one or more values that correspond to the key information that is accepted, from a database that stores a plurality of pieces of key information that includes the key information in association with each value, to calculate a characteristic value that is uniquely defined for the value based on the one or more values that are extracted, and to generate signature data that includes the key information, the characteristic value, and information for the digital signature for each of the one or more values, and a storage unit configured to store the signature data.
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