2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/90278We review the quantum version of a well known problem of cryptography called coin tossing (``flipping a coin via telephone''). It can be regarded as a game where two remote players (who distrust each other) tries to generate a uniformly distributed random bit which is common to both parties. The only resource they can use to perform this task is a classical or quantum communication channel. In this paper we provide a general overview over such coin tossing protocols, concerning in particular their security.LaTeX2e, 13 pages, 1 figureQuantum Physicstext