| 摘要 |
An image encrypting device subjects an image of the designated area in an inputted image to conversion using an encoding key, embedding of information obtained by encrypting the encryption key using a public key paired with the secret key of a sending destination, and conversion of a pixel value one by one in this order to generate a final encrypted image. Then, the image encrypting device sends the encrypted image to the sending destination through a printed matter or a network. An image decrypting device converts the encrypted image of a form of printing data or electronic data to an image and inputs it. Then, the encrypted area in the encrypted image converted to image data is subjected to reverse processing as compared to the processing carried out by the image encrypting device so as to extract a decrypting key (the encrypting key) from the image of the encrypted area. Then, using the decrypting key, the image decrypting device decrypts the original image of the encrypted area to restore the whole encrypt image. |
