基于改进的Logistic混沌映射彩色图像加密算法

摘要

针对彩色图像加密算法需满足加密速度快、Kerckhoff原则、密钥空间大、解密保真度高这4个基本要求，提出了一种改进的具有较大密钥空间的Logistic混沌映射来产生混沌密码序列并在序列异或加密算法上进行改进，通过实验仿真，从直方图、加密效果评价参数、抗剪裁、抗噪声、相关性、密钥空间大小等方面进行了加密效果分析，结果表明该算法可以实现快速地对图像数据流进行实时加解密。%In order to satisfy the color image encryption algorithms′four basic requirements which are the encryption speed,Kerck-hoff principle,large key space,and high fidelity of decryption,this paper proposes an improved and large-key-space-having Logistic chaotic map,which can generate the chaotic password sequences. Meanwhile,this paper presents an improved sequence and XOR en-cryption algorithm,fulfills the experimental simulations,and analyzes the encryption effects through the histogram,the encryption effect evaluation parameters,the performances of cutting-resistant and noise-resistant,correlation,and the size of the key space,re-spectively. The experiment results show that the proposed algorithm can realize the real-time encryption and decryption of color image stream quickly.