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在光学信息安全领域,双随机相位加密方法最引人注目并得到广泛研究,但由于双随机相位加密系统是基于傅里叶变换的系统,其本质上是一种线性变换系统,明文、密文之间的函数依赖关系比较简单,这就为其安全性留下了很大的隐患。双随机相位加密方法可以用光学和数字的方式实现,提出了一种选择明文攻击的方法,利用多个冲击函数作为选择的明文,成功破解了基于数字方法实现的双随机相位加密系统,并给出了恢复密钥的解析式,此方法最大的优点在于解密图像的无损性,并从理论上加以证明,给出了实验结果。
In the field of optical information security, the double random phase encryption method has attracted the most attention and has been widely studied. However, since the double random phase encryption system is based on the Fourier transform system, it is essentially a linear transform system. The plaintext and ciphertext The functional dependency between the relatively simple, which left a lot of security for its hidden dangers. The double random phase encryption method can be implemented by optical and digital methods. A method of choosing plaintext attack is proposed. By using multiple impulse functions as the plaintext of choice, the double random phase encryption system based on digital method is successfully solved, The analytical solution of the recovery key is presented. The biggest advantage of this method lies in the losslessness of the decrypted image, which is theoretically proved. The experimental results are given.