Patent ID: 8289136

Claim:
A Radio Frequency (RF) payment device comprising: a first and a second RF transponder configured to receive a device authentication code from an RF Identification (RFID) reader; a unique device encryption key corresponding to a device identification code associated with the RF payment device; a hand geometry sensor configured to detect a proffered hand geometry sample to create proffered hand geometry sample data, wherein the hand geometry sensor is configured to detect a false proffered hand geometry sample based on hand scan characteristics; and a device authentication circuit configured to use the unique device encryption key to encrypt the device authentication code and a device account code associated with the RF payment device to create an encrypted device authentication code and an encrypted device account code; wherein the first and the second RF transponder is configured to transmit at least one of the encrypted device authentication code and the encrypted device account code to the RFID reader, and wherein the hand geometry sensor comprises a switch configured to place the first and the second RF transponder in at least one of a selectivity mode or an inclusivity mode, wherein the selectivity mode includes enabling purchase of an item using a selected account number and the inclusivity mode includes the first and the second RF transponder in an operational mode permitting the first and the second RF transponder to be responsive to interrogation.