摘要
提出一种基于外部密钥的多混沌系统的图像加密算法。该算法利用Tent混沌映射的均匀分布特性及Logistic映射对初值的高敏感性分别完成对图像像素的置乱和扩散,利用Chebyshev混沌序列具有较好平衡性和伪随机性的特点作为外部密钥,控制Tent映射和Logistic映射的初值和参数,充分利用三个简单的一维混动映射的特性设计了一种有效的图像加密算法。仿真表明,该算法具有很大的密钥空间,对密钥的初值具有很高的敏感性,可以有效地抵御统计攻击和穷举攻击,具有很高的安全性和实用价值。
We propose in this paper an external key-based image encryption algorithm for multi-chaotic system. The algorithm uses the uniform distribution characteristics of Tent chaotic mapping and the high sensitivity of the Logistic mapping on initial value to complete the scrambling and diffusion on image pixels respectively, uses the characteristics of Chebyshev chaotic sequence in good balance property and pseudo randomicity as the external key to control the initial values and parameters of Tent mapping and Logistic mapping, and makes full use of the characteristics of three simple one-dimensional hybrid dynamic mapping to design an effective image encryption algorithm. Simulation shows that this algorithm has big key space, and is highly sensitive to initial value of the key. It can resist statistical attack and exhaustive attack effectively, and has high security and practical value.
出处
《计算机应用与软件》
CSCD
北大核心
2014年第7期320-323,327,共5页
Computer Applications and Software
基金
天津市科技创新专项基金项目(10FDZDGX00400)
