一种基于小波变换域和混沌序列的图像加密算法

伴随网络上图像/视频的应用越来越广泛,图像信息的安全与保密技术越来越重要。本文提出对图像小波变换后的系数进行置乱处理,进一步利用混沌现象的随机性以及不可预测性,产生混沌序列矩阵对变换矩阵进行处理,进一步运用信息隐藏技术对密钥进行隐藏,实现图像信息的高强度加密。利用该方法在不增加图像数据量的情况下,实现图像信息混沌复合加密。该方法既保护了传送图像信息的安全,又不影响合法用户对图像的使用。仿真结果显示:密文加密效果好,恢复图像与原图像一致。

An Image Encryption Algorithm Based on Chaotic Sequences and Discrete Wavelet Transform

More and more scene videos or pictures are transmitted though the internet. There is some sensitive or secrete information in these videos. It is urgent to protect the digital image information, which has been the hotspot of international academia. In this paper, the discrete wavelet transform coefficient matrix was scrambling transformed, and a discrete sequence that was built of a chaotic system was used to process the matrix. The result shows that this algorithm is available, the original image and the restored image is sameness. It will be a feasible and efficient solution to the sensitive and secrete pictures' protection in the Internet.