| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the need for other storage area and other file by which partial encryption data of an image is imbedded to an original image and encrypted data are stored. SOLUTION: An image data display means reads image data and displays the data on a display section (1). A mouse or the like is used for an image data part selection means to select an optional part of an image on the display section (2). An encrypted part is selected, e.g. as a rectangle and their diagonal coordinates may be stored at the end of the original image. Then an encryption means encrypts the selected part (3), and is imbedded to the selected part of the original image data (4). Usually the encrypted data are sent to an opposite party, the opposite party uses a plane text processing means 4 to extract the encrypted part and processes the encrypted part into a plane text and restores the part converted into a plane text to the original data (5). Of course, the data encrypted by itself and stored can be converted into a plane text. In this case, for example, the diagonal coordinates stored at the end of the image are utilized. |
