| 摘要 |
If it is verified that image data generated by an imaging device has not been modified, a first verification device generates watermarked image data by embedding watermark for detecting a modified portion in the image data. The first verification device further generates second verification data (digital signature) of the watermarked image data. A second verification device verifies whether or not the image data has been modified, e.g., using the second verification data. If the image data has been modified, the second verification device detects what portion of the image data has been modified.
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