To enhance the security in optical image encryption scheme and to safeguard it from the invaders, this paper proposes a new scheme using devil’s toroidal lens masks (DTLMs) and QR decomposition in gyrator transform (GT) domain. The proposed cryptosystem utilizes DTLMs which are the complex phase masks designed using the combination of a phases of devil’s mask (\({\rm DM})\) and toroidal mask \(\left({\rm TM}\right)\). QR is an operation used to decompose the matrix and is utilized to supersede the phase-truncation (PT) task in the traditional phase-truncated Fourier transform (PTFT). Hence, the proposed method is immune to the attacks to which the PTFT-based cryptosystems are vulnerable. The cryptosystem is asymmetric as both the encryption and decryption processes are different along with different encryption and decryption keys. The private keys produced during the encryption method are utilized in the decryption process to retrieve the original image. The decryption process can be realized with both the digital and the modified optical architecture. Recommended scheme strengthens the safety of DRPE by growing the key capacity and the number of parameters for safety and vigorous against diverse protection.

为了增强光学图像加密方案的安全性并保护其免受入侵者的侵害，本文提出了一种使用魔鬼环形透镜掩模（DTLM）和回转器变换（GT）域中的QR分解的新方案。所提出的密码系统利用 DTLM，这是使用魔鬼掩码 ( \({\rm DM})\)和环形掩码\(\left({\rm TM}\right)\)的相位组合设计的复杂相位掩码. QR 是一种用于分解矩阵的操作，用于取代传统相位截断傅里叶变换 (PTFT) 中的相位截断 (PT) 任务。因此，所提出的方法不受基于 PTFT 的密码系统易受攻击的攻击。密码系统是非对称的，因为加密和解密过程不同，加密和解密密钥也不同。在加密方法中产生的私钥在解密过程中被用来检索原始图像。解密过程可以通过数字和修改后的光学架构来实现。推荐方案通过增加关键容量和安全参数数量来增强DRPE的安全性，并大力对抗多样化的保护。