中文摘要：

提出了一种结合DCT变换压缩技术的混沌图像加密算法.先对原始图像进行压缩处理,然后用由复合混沌系统生成的加密矩阵先后对压缩后的图像进行位置置乱、灰度值替代加密处理.理论分析和实验结果表明,该算法既能有效地减小图像的存储容量,提高数据的传输速度,又具有良好的加密性能.

英文摘要：

A chaotic image eneryption algorithm, combined with DCT transform compression technology, is presented here. The soul of the new algorithm is to compress the original image before encryption. The encryption matrixes generated by the hybrid chaotic system are used to deal with the compressed image, with the methods of position scrambling and grayscale value alternative encryption. Theoretical analysis and experimental results show that the algorithm can not only effectively reduce the image of storage capacity, improve the speed of data transmission, but also has good encryption performance.