【摘要】 数字图像的安全性传输是研究热点问题.针对现有基于DNA序列的图像加密算法中密钥对明文敏感性不足的问题,提出了一种基于密钥流缓冲区和DNA动态编码的图像加密算法.首先,利用混沌系统产生伪随机序列对明文图像实现全局置乱;然后,通过PWLCM混沌系统初始化密钥流缓冲区,根据明文像素值选择密钥,对置乱图像进行DNA动态编码;最后,对编码后的密文序列再进行一轮扩散操作.仿真结果表明,该算法在置乱度、密钥空间、抵御差分攻击和统计攻击等方面均具有良好的效果.更多还原

【Abstract】 The security of digital image information transfer is a research hotspot. To solve the problem that the key in the existing image encryption algorithm based on DNA sequence has nothing to do with plaintext, an image encryption algorithm based on key-stream buffer and DNA dynamic encoding is proposed. First, the plaintext is globally scrambled by pseudo random sequence generated by chaotic system. Then, key-stream buffers are initialized by PWLCM chaotic system, and the key is selected based on the pixel value of plaintext and DNA dynamic encoding is performed on scrambled images. Finally, a round of diffusion operation is executed on encoded ciphertext sequence. The simulation results show that the proposed algorithm has good performance in scrambling degree, key space, resisting differential attack and statistics attack.更多还原