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Steganography is the science of hiding and communicating a secret message byembedding it in an innocent looking text such that the eavesdropper is unawareof its existence. Previously, attempts were made to establish steganographyusing quantum key distribution (QKD). Recently, it has been shown that suchprotocols are vulnerable to a certain steganalysis attack that can detect thepresence of the hidden message and suppress the entire communication. In thiswork, we elaborate on the vulnerabilities of the original protocol which makeit insecure against this detection attack. Further, we propose a novelsteganography protocol using discrete modulation continuous variable QKD thateliminates the threat of this detection-based attack. Deriving from theproperties of our protocol, we also propose modifications in the originalprotocol to dispose of its vulnerabilities and make it insusceptible tosteganalysis.

Hide and seek with quantum resources: New and modified protocols for quantum steganography