基于四维超混沌系统的彩色图像加密算法

针对彩色图像在加密过程中数据量大、相邻像素相关性强及冗余度高等缺陷,提出基于新四维超混沌的彩色图像加密算法.利用混沌性能更好的四维超混沌系统与反向传播神经网络结合进行序列融合运算,生成伪随机性更好的融合序列作为密钥流;利用密钥流对彩色图像像素块进行位置置乱及像素扩散运算,得到最终的密文图像.仿真计算结果表明,该加密算法...

Color image encryption algorithm based on four dimensional hyper chaotic system

Aiming at the large amount of data,strong correlation between adjacent pixels and high redundancy in the process of color image encryption,a color image encryption algorithm based on four-dimensional hyperchaotic system was proposed.The four-dimensional hyperchaotic system with better chaotic performance was combined with back propagation neural network for sequence fusion operation,the results with better pseudo randomness was generated as key stream.The key stream was used to scramble and spread the color image pixel blocks to obtain the ciphertext image.The simulation results show that the encryption algorithm has good security performances and anti-attack ability.