Patent ID: 7636438
Filing Date: 2009-12-22
Classification: G06Q,G07F

Abstract:
1. A method for conducting an authenticated data exchange transaction between a data carrier having an integrated circuit and an external device with which the data carrier exchanges data, comprising the steps of: establishing a first bidirectional transmission channel between the data carrier and the external device, the first bidirectional transmission channel being configured to exchange signals having signal patterns between the data carrier and the external device; establishing a second bidirectional transmission channel between the data carrier and the external device, the second bidirectional transmission channel being configured to exchange signals having signal patterns between the data carrier and the external device, wherein the second bidirectional transmission channel is logically separated from the first bidirectional transmission channel, the separation of the first and second bidirectional transmission channels being such that data transmission via one bidirectional transmission channel does not interfere with data transmission via the other bidirectional transmission channel and the second bidirectional transmission channel is activable during the total time period between activation and deactivation of the data carrier; and conducting the authenticated data exchange transaction between the data carrier and the external device wherein authentication data and transaction data associated with the authentication data are exchanged between the data carrier and the external device in part via the first bidirectional transmission channel and in part via the second bidirectional transmission channel, comprising having the data carrier generate a signal required for authenticity testing; transmitting the signal for authenticity testing from the data carrier to the external device or a signal required for generating the signal for authenticity testing from the external device to the data carrier at least partly via the second bidirectional transmission channel; and having the external device receive the signal for authenticity testing, and deciding on the basis of the received signal whether the data carrier is authentic.