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中文摘要：
为增强图像加密的安全性,分析了二维混沌映射图像加密技术,提出了一种新的改进算法.采取构造复合加密系统、增加扩散函数、改变密钥设计等方法解决二维混沌映射加密图像时只改变图像位置,没有改变像素值,存在周期性、无扩散、实际密钥空间比理论值小等安全隐患问题.将Baker map公式化,然后利用复合混沌系统的思想,以Baker map为例提出了一种新的改进算法.仿真验证了改进算法的安全性.仿真表明,改进算法对其他二维混沌映射Cat map等均有效.
英文摘要：
In order to improve the security of image encryption, this paper analyzed the image encryption based on two-dimensional chaotic maps and proposed a new image encryption algorithm. Methods including adding diffusion mechanism, changing the design of key and developing composite encryption system were used to solve the problems in the image encryption of two-dimensional chaotic maps, such as beriodicity no diffusion and the real key space littler than the theoretical value. This paper formulized the Baker map. Then it proposed a new image encryption based on Baker map. The simulation results show that the proposed encryption algorithm is valid and fit for other two-dimensional chaotic map.
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