基于一种新分数阶混沌电路的彩色图像加密方法

A Color Image Encryption Based on a New Fractional Order Chaotic Circuit

为了提高传统混沌系统彩色图像加密方法的密钥空间,该文基于分数阶Chen电路设计了一个新的混沌电路来对彩色图像进行加密。该电路利用混沌的遍历性和一个绝缘栅型场效应管得到一个时变电阻。用该时变电阻替换分数阶Chen电路分抗中的一个电阻,使得分抗实时变化。与参数固定不变的混沌加密系统相比,该混沌电路拥有更好的伪随机性、更大的参数调节范围,进而有更大的密钥空间,使得加密的安全性得到保障。实验结果证实了该加密方法的有效性。

A new chaotic circuit,based on the fractional order Chen's circuit,is newly-built for color image encryption with great effect of traditional color image encryption.The ergodic property of chaos and a MOS(Metal-Oxide-Semiconductor)are applied to get a resistor with a complex dynamic process.The resistor is used to take place of a linear resistor of tree circuit uint of fractional order Chen's circuit,which leads to tree circuituint is time-varying.Compared with the traditional chaotic encryption system with fixed parameters,this chaotic circuit displays better pseudo-random behavior,bigger parameter's range of adjustment.This makes the encryption system have larger key space,that is,the security of the encryption is enhanced.Simulation results and security analysis show that the proposed method is both secure and reliable for color image encryption.