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

Quantum Steganography via Coherent and Fock State Encoding in an Optical Medium