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IMAGE ENCRYPTION DEVICE/DECRYPTION DEVICE, IMAGE ENCRYPTION METHOD/DECRYPTION METHOD, AND IMAGE ENCRYPTION PROGRAM/DECRYPTION PROGRAM
IMAGE ENCRYPTION DEVICE/DECRYPTION DEVICE, IMAGE ENCRYPTION METHOD/DECRYPTION METHOD, AND IMAGE ENCRYPTION PROGRAM/DECRYPTION PROGRAM
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机译:图像加密设备/解密设备,图像加密方法/解密方法以及图像加密程序/解密程序
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摘要
Constraints are added to the size of an encryption area at the time of encryption processing. For example, if the respective number of horizontal and vertical divided blocks is divided by a predetermined positive integer, the size of the encryption area is limited such that the remaining is a certain number of 0 (namely, a multiple of the predetermined positive integer to the respective number of blocks) or 1 or more. Block positions in the encryption area are detected according to the constraints of the number of blocks of an encryption image as the decryption processing corresponding to the encryption processing. Because the number of horizontal and vertical blocks is previously limited at the time of the encryption, the possibility of the number of blocks to be considered in the detection of the block positions is reduced, resulting in improved decryption accuracy.
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