为了提高光学图像加密系统中双随机相位编码加密技术的安全性, 提出了一种基于DNA编码与菲涅尔域DRPE的双重光学加密技术。对光学图像进行DNA编码, 通过DNA编码的加法运算与交叉操作对光学图像进行初步的置乱处理; 在菲涅尔域对像素进行双随机相位编码加密处理, 在加密过程中使用一个副图像生成两个混合相位模板; 将双随机相位编码加密的图像与两个随机矩阵的克罗内克乘积相乘, 获得最终的加密结果。仿真实验结果表明, 所提加密方案在加密过程中增加了密钥数量, 通过双重置乱处理增强了加密系统的抗攻击能力。

In order to enhance the security of double random phase encoding technology in the optical image cryptosystem, a double-barreled optical encryption technique based on DNA encoding and Fresnel domain DRPE is proposed. Firstly, optical images are encoded by DNA encoding technique, the addition operation and crossover operation of DNA encoding technique are applied to the optical images as the first image scrambling stage; then, pixels are encrypted by double random phase encoding technique in Fresnel domain, and a secondary image is adopted in the encryption procedure to generate two hybrid phase masks; lastly, the result image of double random phase encoding encryption is multiplied with the Kronecker product of two random matrixes to produce the final encryption results. Simulation experimental results show that the proposed encryption schema increases the unknown keys of the encryption process, and enhances the security to the attacks through double-barreled permutation.