To improve the performance of Tangent-Delay Ellipse Reflecting Cavity map System (TD-ERCS) and achieve effective protection of color image information, the authors proposed an improved algorithm for the TD-ERCS chaotic sequences and a color image encryption algorithm which was based on this improved sequences. The four-dimensional chaotic real sequences and binary sequences which had ideal random performance were obtained by improving the TD-ERCS. The image,which was composed of the RGB component of the color image, was scrambled by using the improved TD-ERCS chaotic sequences with 8 × 8 blocks, and then the image was encrypted. The theoretical analysis and experimental results show that the performances of improved TD-ERCS sequences are better than original sequences; the color image encryption algorithm has larger space of key, better encryption effect, higher encryption efficiency, and it also has better security to statistical analysis and stronger ability against JPEG compressing attacks.%为了提高切延迟椭圆反射腔映射系统(TD-ERCS)的性能,实现对彩色图像信息的有效保护,提出了一种对TD-ERCS混沌序列的改进和基于该改进序列的彩色图像加密算法.分析与研究了TD-ERCS并加以改进,得到随机性能理想的四维混沌实值序列和二值序列;将彩色图像RGB三分量合成一图像后应用改进的TD-ERCS混沌序列以8×8分块置乱,从而加密图像.理论分析和实验结果表明,TD-ERCS改进序列性能更好;彩色图像加密算法密钥空间大,具有较好的加密效果和高的加密效率,并对统计分析具有较好的安全性和较强的抗JPEG压缩攻击能力.
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