This invention relates to a method and system to ensure the safe use of magnetic strip cards in order to prevent the theft of information contained in the magnetic strip of a industry standard magnetic strip card. Security system enabling the safe use of magnetic strip cards that implements the method, composed of a half-cylinder, equipped with a special slot of a thickness almost similar to the magnetic strip card and wide of one card length, a mechanical card loading and rotating device, card presence and position sensors, electrical motors for the mechanical system, an overall electronic command and control module and the physical security box containing all parts of the system.