中文摘要：

为了研究数字图像网络传输的安全性问题,提出一种基于混沌系统的有效的加密方案.构建一种新的双logistic混沌系统作为信号源,选取合适的密钥,经适当处理后得到图像加密序列.综合像素位置置乱和灰度值替代法的思想,用加密序列进行图像加密.对直方图、密钥空间、初值敏感性以及加密速度等指标进行了分析,结果表明,该方案可以有效地运用于数字图像加密,并具有良好的加密和解密性能.

英文摘要：

To study the security problems of network transmission of digital images, an effective encryption scheme based on a chaotic system was proposed in this paper. One kind of new chaotic systems was constructed and applied to encryption. Based on the chaotic system and suitable treatment, the image encryption sequences were obtained. The pixel position scrambling method and gray value substitution method were synthetically used in the image encryption with encryption sequences. The results reveal that the scheme can be effectively applied to the digital image encryption. Some indexes, such as the histogram, the initial value sensitivity, the key space and the encryption speed, were analyzed to show that the algorithm has good encryption performance.