基于迭代相位恢复和相位截断的非对称光学加密拓扑（英文）

Asymmetric Optical Image Cryptography Topology Based on Phase Retrieve Algorithm and Phase-truncated Fourier Transforms

基于迭代相位恢复算法提出了一种非对称光学图像加密拓扑.该系统通过在相位迭代恢复过程中使用相位截断和补偿来构造一个单向陷门函数,生成一对用于加密的公钥和相应的解密私钥,以一种非对称的方式实现原文和密文加密和还原.与传统加密方法不同的是,利用特定的光学6f系统,该加密方案可将原文图像加密隐藏到具有独立信息的实值密文图像中.将点对点的图像节点之间的图像加密进行拓展,可构成具有多种拓扑单元的光学图像加密拓扑.在拓扑网络中,每一幅图像可视为一个网络节点,它们既具有自身的信息值,也能实现节点之间的非对称转换和加密传输,实现快捷高效的图像存储和传输的同时也极大地提高了网络拓扑结构在应对噪声和许多已知攻击时的鲁棒性和安全性.数值模拟实验结果表明了该系统的可行性和有效性.

In this paper, we propose an asymmetric optical image encryption topology based on the cascaded phase retrieval algorithm. The asymmetric structure uses the phase truncation and compensation to create a one-way trapdoor on the basis of phase iterative retrieve. This method encodes the plaintext into a completely different real-valued ciphertext image with the help of a specially designed optical 6f system. As a result, it can be implemented in topology architectures to realize the asymmetric interconnection between topology nodes. Comparing with the existing scheme, our method achieves the convenience of data storage and transmission, as well as high robustness and security against the reported attacks. Simulation results are also demonstrated to verify the validity and feasibility of the proposed cryptosystem.