Cai Jianjun, Shen Xueju, Wu Huilong, Lin Chao
Appl Opt. 2015 May 20;54(15):4760-4. doi: 10.1364/AO.54.004760.
We demonstrate an effective ciphertext-only attack (COA) method on a joint transform correlator-based cryptosystem with sizes and locations of the plaintext and the key code unknown. In this paper, we first obtain the signal domain support by using the method, which is based on the geometry of the autocorrelation support of the object. And then, the hybrid input-output algorithm is used to retrieve the plaintext. Compared with the work on COA recently reported by Zhang et al., our proposed method needs fewer resources and much fewer iteration times for binary image to retrieve the plaintext. Simulation results are provided to demonstrate the validity of the presented method.
我们展示了一种针对基于联合变换相关器的密码系统的有效唯密文攻击（COA）方法，其中明文和密钥代码的大小及位置均未知。在本文中，我们首先使用基于对象自相关支持几何形状的方法来获取信号域支持。然后，使用混合输入输出算法来检索明文。与Zhang等人最近报道的关于唯密文攻击的工作相比，我们提出的方法在检索二进制图像明文时所需资源更少，迭代次数也少得多。提供了仿真结果以证明所提方法的有效性。
