基于DNA随机置换的新型图像加密算法研究

A Novel Image Encryption Algorithm Based on DNA Random Permutation

针对一些加密算法空间小,明文与密文相关性大,初值敏感性差等问题,提出一种DNA序列随机置换的图像加密算法。算法首先利用混沌序列的随机性对明文像素进行两次位置置乱。接着随机选择一种DNA编码方式对图像矩阵和混沌序列进行DNA编码,同时随机选择DNA运算方式与混沌序列进行运算,从而改变图像矩阵的数值,再对图像矩阵进行扩散操作形成密文图像。最后对密文进行安全性分析,仿真结果表明,上述算法复杂度高、密钥空间大,密文对明文的敏感度高,能够有效抵御统计分析攻击、穷举攻击和差分攻击。

Aiming at the problem of small key space and great correlation between plaintext and ciphertext and low initial sensitivity,a novel image encryption algorithm based on DNA random permutation is proposed.At first,the randomness of chaotic sequence was used to scramble the pixel position twice.Then a random DNA encoding method was selected to encode the image matrix and chaotic sequence,and the DNA operation mode and chaotic sequence were randomly selected for operation,so as to change the value of plaintext image matrix,and then the image matrix was diffused to form ciphertext image.Finally,the security of ciphertext was analyzed.The simulation results demonstrate that the algorithm has high complexity,large key space,high sensitivity to plaintext,and can effectively resist statistical analysis attack,exhaustive attack and differential attack.