Steganography is an alternative to cryptography, where information is protected by secrecy -- being disguised as innocent communication or noise -- rather than being scrambled. In this work we develop schemes for steganographic communication using Fock and coherent states in optical channels based on disguising the communications as thermal noise. We derive bounds on their efficiency in the case of an all-powerful eavesdropper, and provide explicit methods of encoding and error correction for the noiseless channel case.

翻译：隐写术是密码学的一种替代方案，其通过将信息伪装成无害通信或噪声（而非加密处理）来实现保密。本研究基于将通信伪装为热噪声的策略，提出了在光学信道中利用福克态与相干态进行隐写通信的框架。我们推导了在具有全知能力的窃听者情形下该方案的效率边界，并针对无噪声信道提供了明确的编码与纠错方法。