基于圆谐分量的密码隐写伪装双层光学安全框架
Dual-Layer Optical Security Framework for Cryptogram Camouflage Using Circular Harmonic Components
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中文总结 AI 辅助
本研究提出基于圆谐分量的双层光学安全框架，整合光学加密与隐写伪装，可将加密信息伪装于图案中，经数值模拟验证有效，为后续实验提供可行路径。
中文摘要 AI 辅助
保护机密信息不仅需要防止未授权访问加密数据，还需隐藏受保护信息的存在。本研究提出一种计算型双层光学安全框架，将光学加密与隐写伪装整合为统一策略，基于4F光学架构，采用两类二维私钥：一类是通过圆谐分量（Circular Harmonic Components, CHC）表示的纯相位密钥，另一类是作为第二密钥的周期振幅掩码。二者协同作用，可从加密的RGB图像生成视觉差异明显的隐写图，同时确保授权用户能正确恢复原始信息。与易产生可识别密码图的传统光学加密方法不同，该方案在解密操作前将加密信息伪装于伪装图案中，提供额外保护层。数值模拟验证了加密、伪装及图像恢复的成功性，且修改私钥与周期掩码参数可生成不同隐写外观。此外，还提出基于马赫-曾德尔干涉仪与数字全息记录的潜在光学实现方案，为未来实验验证提供可行路径。本研究作为双层光学安全框架的概念验证，全面的密码分析评估超出本研究范围，留待后续工作开展。
英文摘要
Protecting confidential information requires not only preventing unauthorized access to encrypted data but also concealing the very existence of the protected information. In this work, we propose a computational dual-layer optical security framework that integrates optical encryption and steganographic camouflage into a unified strategy. The proposed method is based on a 4F optical architecture and employs two two-dimensional private keys: a phase-only key represented through Circular Harmonic Components (CHC) and a periodic amplitude mask acting as a second secret key. Their combined action generates visually diverse steganograms from encrypted RGB images while preserving the correct recovery of the original information by authorized users. Unlike conventional optical encryption methods that produce easily recognizable cryptograms, the proposed approach disguises the encrypted information within camouflage patterns, providing an additional layer of protection before any decryption process is attempted. Numerical simulations demonstrate successful encryption, camouflage, and image recovery while showing that different steganographic appearances can be generated by modifying the private key and the periodic-mask parameters. Furthermore, a prospective optical implementation based on a Mach--Zehnder interferometer and digital holographic recording is presented, providing a feasible path toward future experimental realization. The proposed methodology is introduced as a proof of concept of the dual-layer optical security framework; a comprehensive cryptanalytic evaluation is beyond the scope of this first study and is left for future work.
