image encrypt 图像加密
Although traditional text encryption approaches can be used to encrypt image, they are inefficient since without using characteristics of image data.
尽管传统文本加密方法可以用于加密图像，但因为未考虑图像数据特点，加密效率不高。
Experiments show that, encryption algorithm can effectively encrypt images and obtain the best parameters to achieve the best image encryption effect.
通过实验表明：加密算法能对图像进行有效的加密，得出最佳的参数以达到最好的图像加密效果。
Because the decoding keys are added to four from two, anti-counterfeiting intensity can be improved greatly when it is used to encrypt image or anti-counterfeit.
利用这种方法进行图像加密，使加密图像的密钥由原来两重增加到四重，从而提高了系统的保密性能。
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