Secure and portable payment system

Abstract

Payment systems are provided that utilize a portable device, and in particular, payment systems that utilize a first portable device that belongs to a seller and a second portable device that belongs to a buyer, but do not utilize a point of sale (POS) device.

1 . A method for making a payment for a financial transaction utilizing a portable device, comprising the steps of:
 selecting a software application stored on the portable device;   selecting a digitally signed document stored on the portable device;   transmitting the digitally signed document;   speaking an amount for the financial transaction;   generating an acoustic signal, wherein the acoustic signal includes the amount for the financial transaction;   generating, by a speaker of the portable device, the acoustic signal;   receiving, by a microphone of a seller portable device, the acoustic signal;   analyzing the acoustic signal to determine a computed voiceprint;   receiving, by the seller portable device, the digitally signed document;   analyzing the digitally signed document to determine a signed voiceprint;   comparing the computed voiceprint and the signed voiceprint;   extracting an identity from the digitally signed document; and   charging a credit card account associated with the identity.   
     
     
         2 . A method for identifying an entity, comprising the steps of:
 receiving a digital signature from the entity, wherein the digital signature includes a signed voiceprint;   requesting a spoken phrase from the entity, wherein the spoken phrase comprises one or more requested words;   receiving the spoken phrase from the entity;   utilizing speech recognition technology to recognize words of the spoken phrase;   comparing the recognized words to the requested words;   analyzing the spoken phrase to determine a computed voiceprint;   verifying the received digital signature;   comparing the computed voiceprint and the signed voiceprint; and   extracting the entity's identity from the digital signature.   
     
     
         3 . The method of  claim 2 , further comprising the step of displaying the entity's identity. 
     
     
         4 . The method of  claim 2 , further comprising the step of displaying the spoken phrase.