2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/114537In 2004, Ba An Nguyen [Phys. Lett. A 328, 6-10] has presented a Quantum Dialogue scheme for simultaneously communicating their messages. In this comment, we show that the quantum dialogue scheme is not secure against the intercept-and-resend attack and we propose a modified scheme which is secure against that attack.1figureQuantum Physicstext