Analysis of singular phase based on double random phase encoding using phase retrieval algorithm
Analysis of singular phase based on double random phase encoding using phase retrieval algorithm
复制标题
DOI：
10.1016/j.optlaseng.2020.106300
复制
发表时间：
2020-11-01
影响因子：
4.6
通讯作者：
Suzuki, Hiroyuki
中科院分区：
文献类型：
--
作者：
Nakano, Kazuya;Suzuki, Hiroyuki
我们分析了基于相位检索的奇异相位的性质。相位可以从已知明文攻击的结果中估计出一种典型的光学加密技术，即双随机相位编码。奇异阶段生成的解密密钥只能用于解密用于攻击的已知密文图像。然而，是否有未知的密文图像可以使用奇异密钥（具有奇异属性的相位密钥图像）解密，这是不明显的。因此，我们通过改变空间平面上的明文图像和随机相位掩码两个参数来制备各种密文图像，并通过解密这些未知的密文图像来分析奇异密钥的性质。结果表明，对仅改变明文图像生成的未知密文图像进行解密，即可获得已知的明文模式。而对仅改变随机相位掩码生成的未知密文图像进行解密时，则得不到任何模式。这些情况都表明密码分析失败了。然而，当获得已知明文模式时，表明已知和未知随机相位掩码之间的相关性很高，这为攻击者提供了重要线索。
We analyze the properties of the singular phase based on phase retrieval. The phase can be estimated from the result of the known-plaintext attack on a typical optical encryption technique, namely double random phase encoding. The key generated by the singular phase for decryption can be used to decrypt only the known ciphertext image used for the attack. However, it is not obvious whether any unknown ciphertext image can be decrypted using the singular key (a phase key image that has the singular property). Therefore, we prepared various ciphertext images by changing two parameters, namely the plaintext image and a random phase mask in the spatial plane, and analyzed the properties of the singular key by decrypting these unknown ciphertext images. The results show that when the unknown ciphertext images generated by changing only the plaintext image are decrypted, the known plaintext pattern is obtained. In contrast, when the unknown ciphertext images generated by changing only the random phase mask are decrypted, no pattern is obtained. These cases both indicate that cryptanalysis failed. Nevertheless, when the known plaintext pattern is obtained, it indicates that the correlation between the known and unknown random phase masks is high, giving the attacker an important clue.