2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/92135We propose an entanglement-based protocol for two people to simultaneously exchange their messages. We show that the protocol is asymptotically secure against the disturbance attack, the intercept-and-resend attack and the entangle-and-measure attack. Our protocol is experimentally feasible within current technologies.4 pages, Revtex4Quantum Physicstext