2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/209162We show how continuous variable systems can allow the direct communication of messages with an acceptable degree of privacy. This is possible by combining a suitable phase-space encoding of the plain message with real-time checks of the quantum communication channel. The resulting protocol works properly when a small amount of noise affects the quantum channel. If this noise is non-tolerable, the protocol stops leaving a limited amount of information to a potential eavesdropper.6 pages, 5 figures, REVTeXQuantum PhysicsOpticstext