基于混沌和DNA动态编码的图像加密算法

Image encryption algorithm based on chaos and dynamic DNA coding

以时空混沌模型作为核心控制方程,设计了一种基于动态DNA编码的图像加密算法。该算法使用耦合映像格子(Coupled map lattices,CML)中格子的状态值来编制索引,然后根据索引值选择像素点的DNA编码规则。由于对像素点的DNA编码是动态变化的,很好地解决了DNA编码规则少所带来的安全隐患,提高了算法的安全性。在加密图像的过程中,还通过密文反馈和混沌系统的迭代来增强算法的混淆和扩散特性。仿真实验表明,算法具有很好的安全性,适合应用于图像加密。

An image encryption algorithm based on dynamic DNA coding is proposed, which uses the spatiotemporal chaotic model as the core control function. In this algorithm, the indexes are created according to the status values of the coupled map lattices. Then, the DNA coding rules are determined by the indexes. Since the pixels are coded as different DNA bases with variable rules, the security of the encryption algorithm is improved. Moreover, the Cipher-block chaining mode and chaos iteration are employed in the encryption process to enhance the confusion and diffusion of the algorithm. Simulation experiments show that the proposed algorithm has good security and high potential to be applied in image encryption.