SMART CARD HAVING AN OPTICAL COMMUNICATION CIRCUIT AND A METHOD FOR USE THEREOF

摘要

A system for carrying out a secure transaction between a data transaction device and a client machine, wherein the data transaction device includes at least one optical sensor for receiving from an application a light beam modulated with data that informs a user of the data transaction device of a return code for sending to the client machine in order to complete the transaction. The client machine includes a modulator for modulating a signal representative of a light beam with data associated with a transaction code so as to form a modulated light beam signal, and a display driver coupled to the modulator and responsive to the modulated light beam signal for illuminating a display device so that at least some pixels thereof emit a light beam that is modulated with the data. A verification unit verifies a return code issued by a user of the data transaction device, and a transaction processor is coupled to the verification unit for processing the transaction in accordance with the transaction code if the return code matches the transaction code or a function thereof.