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分析了约束集投影和4f相关器的光学加密系统的安全性,并提出一种基于双强度相位恢复的已知明文攻击方法。约束集投影和4f相关器的加密系统是典型的光学密码系统,由于其解密系统可以等价于一个标准的4f系统,并且加密密钥与解密密钥相同,因此本质上仍是一个线性系统,这就为系统的安全性留下了很大隐患。该攻击方法仅利用一对输入的相位信息和相应输出的强度信息即可成功得到加密系统的密钥,提高了攻击实施的可行性。
The security of constrained set projection and 4f correlator optical encryption system is analyzed, and a known plaintext attack method based on double intensity phase recovery is proposed. Constraint set projection and 4f correlator encryption system is a typical optical cryptosystem, because its decryption system can be equivalent to a standard 4f system, and the encryption key and decryption key are the same, it is still essentially a linear system, This leaves great hidden dangers for the security of the system. The attack method can only obtain the key of the encryption system successfully by using only one pair of input phase information and the corresponding output intensity information, thereby improving the feasibility of the attack implementation.