| 摘要 |
Means for confirming the validity of the contents of a change made to a disclosed content is provided for use in a content disclosure system in which a signed content may be modified and the validity of the modified signed content may be verified using a verification key corresponding to a signature on the content before the modification. When a signed changed-content is created based on a request to change a signed content, a signed content change device connected to the content disclosure system generates restoration validity proving data for restoring the signed changed-content to a state before the change and proving the validity of the restored Contents. A verification key of the signed content, the signed changed-content, and the restoration validity proving data are provided to allow a third party to confirm the validity of the content.
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