Patent ID: 7392396
Filing Date: 2008-06-24
Classification: G06F,G06Q

Abstract:
1. A transaction device for receiving a user input, the transaction device comprising: a user-interfaceable surface, coupled to at least one source of electrical potential so as to generate an x-axis signal and a y-axis signal as a function of the at least one source of electrical potential and a location of the user input; a signal generating unit generating a random signal; and an arithmetic unit generating an encrypted output signal by adding the random signal to at least one of the x-axis signal and the y-axis signal, wherein the adding comprises at least one of (i) combining the random signal with the at least one source of electrical potential and (ii) combining the random signal with the at least one signal, and wherein the signal generating unit comprises: a random digital signal generator; and a digital-to-analog converter coupled to receive output from the random digital signal generator, wherein an output from the digital-to-analog converter is the random signal.