JP2009152774A5 - - Google Patents

Claims (6)

A plurality of drive circuits to display the image, different pair of secret key information and public key information is assigned to each the electronic paper having a memory property that holds a written image the image display area, a memory circuit electronic paper identification information for identifying the electronic paper has been stored, respectively constitute a pair, the secret key information image information encrypted by the public key information of said plurality of drive circuits comprising a plurality of decoding circuits, a, through the communication device transmits the electronic paper identification information and the public key information to the server apparatus, the image information that has been encrypted by the public key information server for decoding by received from the apparatus, the image information encrypted decoded by the plurality of decoding circuits, and displays the image information decoded with respect to the electronic paper And the child paper display control unit,
First common key encrypted by the information to aggregate the electronic paper identification information and the public key information received from the electronic paper display control unit, and the communication device to be transmitted to the server device,
A plurality of image information divided from one image information, the first common key information respectively encrypted with the public key information decoded by the divided source is the one reproduced information reproducible image information is in conjunction with, and the server device to be transmitted to the electronic paper display control unit having the electronic paper identification information,
An image display system comprising: The reproduction information includes sequence information that is rearranged in a regular order,
2. The server device according to claim 1, wherein when the plurality of divided pieces of image information are respectively encrypted and transmitted to the electronic paper display control unit, the server device rearranges them in a random order and transmits them. Image display system. The server device adds the reproduction information to the head of at least one of the plurality of divided image information when each of the plurality of divided image information is encrypted and transmitted to the electronic paper display control unit. the image display system according to claim 1 or 2, characterized in that transmitting Te. Each of the server device and the electronic paper display control unit stores second common key information,
The server device encrypts the reproduction information with its second common key information,
The image display system according to any one of claims 1 to 3, wherein the electronic paper decrypts the reproduction information using its second common key information.   The image display system according to claim 1, wherein the identification information is information obtained by connecting the plurality of public key information.   6. The image display system according to claim 1, wherein the decryption circuit is a circuit for decrypting encryption by stream cipher.