| 摘要 |
PROBLEM TO BE SOLVED: To impart credibility to an electronic filing document by a certificate authority in addition to the correctness insurance of the electronic filing document and the protection of secret information. SOLUTION: In an information submission device, electromagnetic information m as an input is converted to information m', and information m' is transmitted to a third person's signature device for making it possible to perform signature verification even if the information m is made partly secret. In the signature device, signature information Sign is generated with respect to the information m' received from the information submission device, and the information Sign is returned to the information submission device. In the information submission device, public information m<SP>s</SP>is generated based on information, as an input about whether the information may be known to the signature verification device or not with respect to the electromagnetic information m. The information submission device transmits the signature information Sign which is received from the signature device and the generated public information m<SP>s</SP>to the signature verification device. In the signature verification device, the signature verification is performed based on the signature information Sign and the public information m<SP>s</SP>which are received from the information submission device as an input. COPYRIGHT: (C)2006,JPO&NCIPI
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