一种混沌图像加密算法研究

A chaotic image encryption algorithm

针对传统基于混沌加密系统没有考虑图像信息自身特点的缺点,文章提出了一种混沌图像加密算法。该算法首先利用混沌理论的到图像的混沌序列,然后通过DCT变换对得到的序列进行位置置乱、灰度值替代的加密处理。文章还对此算法密钥空间、密钥敏感性、抗噪声性能和抗破损性能分别进行了分析。仿真结果和性能分析表明,在保证加密性能的同时,不但图像的存储容量大大减小,而且图像的传输速度也得到了有效地提升。

The traditional encryption system based on chaotic image information without considering the shortcomings of its own characteristics, the article presents a chaotic image encryption algorithm. The algorithm uses the image of chaos theory chaotic sequence, then the resulting sequence of DCT transform scrambling for position, the gray value alternative encrypted. The article also algorithm key space, the key sensitivity, noise resistance and breakage resistance properties were analyzed. Simulation results and performance analysis shows that the encryption performance while ensuring not only greatly reduce the storage capacity of the image, and the image transfer speed has been effectively improved.