2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150930We show that a secure quantum protocol for coin tossing exist. The existence of quantum coin tossing support the conjecture of D.Mayers [Phys.Rev.Lett. 78, 3414(1997)] that only asymmetrical tasks as quantum bit commitment are impossible.withdrawlQuantum Physicstext