| 摘要 |
<p>Provided is means for checking validity of a modification content performed on a disclosed content in a content disclosure system which allows correction of a signed content and can verify validity of a signed content after correction by a verification key corresponding to a signature attached to the content before corrected. When a signed content modification device connected to the content disclosure system creates a signed modified content according to a signed content modification request, recovery validity authentication data is created in advance for recovering the signed modified content to the state before the modification and authenticating the validity of the recovered content. The signed content verification key, the signed modified content, and the recovered validity authentication data are provided so that a third person can check the validity of the content.</p> |
