Optical encryption has provided a new insight for securing information; however, it is always desirable that high security can be achieved to withstand the attacks. In this Letter, we propose a new method via learning complex scattering media for optical encryption. After the recordings through complex scattering media, a designed learning model is trained. The proposed method uses an optical setup with complex scattering media to experimentally record the ciphertexts and uses a learning model to generate security keys. During the decryption, the trained learning model with its parameters is applied as security keys. In addition, various parameters, e.g., virtual phase-only masks, can be flexibly applied to further enlarge key space. It is experimentally demonstrated that the proposed learning-based encryption approach possesses high security. The proposed method could open up a new research perspective for optical encryption.

中文翻译：

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学习复杂的散射介质以进行光学加密。

光学加密为保护信息提供了新的见解。但是，始终希望能够获得高安全性以抵御攻击。在这封信中，我们提出了一种通过学习复杂的散射介质进行光加密的新方法。通过复杂的散射介质进行录制后，将训练一个设计好的学习模型。所提出的方法使用具有复杂散射介质的光学装置来实验地记录密文，并使用学习模型来生成安全密钥。在解密期间，将经过训练的学习模型及其参数用作安全密钥。另外，可以灵活地应用各种参数（例如，仅虚拟相位的掩码）来进一步扩大键空间。实验证明，提出的基于学习的加密方法具有很高的安全性。