基于DNA编码和超混沌系统的图像加密算法

Image encryption algorithm based on DNA coding and hyperchaotic system

文中提出了一种基于DNA编码和超混沌系统的图像加密算法.首先将明文图像矩阵分解为16个子块,而后将子块重新编排为一个新二维矩阵,再利用超混沌Bao系统以及Henon混沌映射各生成一个伪随机序列,分别将其转换为DNA矩阵,利用DNA编码运算,对图像进行加密.由于文中的加密算法融合了密钥与明文图像相关联的方法,因此克服了以往加密算法中DNA编码规则单一、密钥分布离散型差、算法复杂度偏低等缺陷与不足.仿真测试表明该算法安全性强、密钥空间大、对密钥的敏感度高,能够有效地抵御穷举攻击、统计攻击和差分攻击等,具有良好的应用前景.

An image encryption algorithm based on DNA coding and hyperchaotic system was proposed.First,the image matrix was decomposed into 16 sub blocks,and the sub blocks were rearranged to a new two-dimensional matrix.Then the hyperchaotic Bao system and the Henon chaotic map were respectively used to generate a pseudo-random sequence,which were converted into DNA matrices.The image was encrypted by using the DNA coding operation.Because the encryption algorithm combined the method of correlation between the key and the plaintext image,it has overcome the defects and shortcomings of the previous encryption algorithms,such as the single DNA coding rules,the discrete-time distribution of key distribution,the low complexity of the algorithm and etc..The simulation test shows that the algorithm has strong security,large key space and high sensitivity to the key.It can effectively resist poor attack,statistical attack and differential attack and etc.,which has good application prospect.