【摘要】 当前彩图加密算法都是对其R、G、B分量进行独立加密,属于多通道加密机制,增大了传输延迟;而现有单通道彩图加密算法主要采取频谱切割与压缩思想,忽略了图像高频成分,易产生较大失真。为此,提出混沌掩码耦合迭代复数模型的单通道彩图RGB同步无损加密算法。引入DCT(discrete cosine transform)与ZigZag扫描,将提取的RGB分量演变为3个矩阵;设计迭代复数模型,形成复数矩阵;借助Logistic映射扰乱其实部与虚部;通过IDCT(inverse discrete cosine transform)机制,形成复合图像;结合混沌掩码,构造双重加密函数,获取密文。仿真结果表明,与当前彩图加密机制相比,该算法无失真,解密质量更高且高度安全。更多还原

【Abstract】 The current color image encryption algorithms independently encrypt the RGB components,which belong to multichannel encryption mechanism,resulting in big transmission delay.Existing single channel color image encryption algorithms mainly adopt the spectrum cutting technology,which ignores the high frequency component of image and produces the crosstalk effect.To solve these problems,single channel color image synchronous lossless encryption algorithm for RGB components based on plural model coupled chaotic mask was proposed.The DCT transform and ZigZag scanning were introduced to transform RGB components into three matrixes.These matrixes were taken into composite matrix by using the iteration image plural model.The position between real and imaginary parts of plural matrix is permutated using Logistic map.The composite permutation image was formed using the IDCT.The double encrypt function was constructed with chaos phase mask to get the gray cipher.Simulation results show that this encryption algorithm is highly secure.Compared with current algorithms,this algorithm has lossless distortion and its decryption quality is high.更多还原