| 摘要 |
The present invention is aimed at the proposal of a limited blind signature system which is highly safe such that its safety can be proven without the assumption of a random oracle model. A signature presenting apparatus is supplied with a public key, a blind secret identifier, a blind public identifier, a blind signature, and a random number. A signature verifying apparatus outputs "valid" if the signature presenting apparatus is supplied with the data and otherwise outputs "invalid".
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