Secure NFC forwarding from a mobile terminal through an electronic accessory

1. A mobile terminal comprising:

a processor configured to execute an application in a memory to generate transaction data;

a NFC circuit configured to:

receive the transaction data responsive to the processor executing the application; and

encrypt the transaction data to output NFC encrypted transaction data;

a wireless network circuit configured to:

establish a wireless network link with an accessory device, wherein the accessory device is separate from the mobile terminal;

encrypt the NFC encrypted transaction data to output combined wireless network+NFC encrypted transaction data; and

transmit the combined wireless network+NFC encrypted transaction data through the wireless network link to the accessory device for relay to another NFC enabled communication device,

wherein the NFC circuit comprises a first NFC circuit, wherein the wireless network link comprises a Bluetooth link, and wherein the wireless network circuit comprises a Bluetooth circuit configured to:

receive encrypted transaction response data via the Bluetooth link from the accessory device that is encrypted by a second NFC circuit of the another NFC enabled communication device with a NFC encryption and is further encrypted by a Bluetooth circuit of the accessory device with a Bluetooth encryption; and

decrypt the encrypted transaction response data to remove the Bluetooth encryption while leaving the NFC encryption to output NFC encrypted transaction response data; and

wherein the first NFC circuit is further configured to:

decrypt the NFC encrypted transaction response data to remove the NFC encryption to generate transaction response data; and

output the transaction response data for use by the application.

2. The mobile terminal of claim 1 , wherein the wireless network link comprises a Bluetooth link, and wherein the wireless network circuit comprises a Bluetooth circuit configured to:

establish the Bluetooth link to the accessory device;

encrypt the NFC encrypted transaction data to output combined Bluetooth+NFC encrypted transaction data; and

transmit the combined Bluetooth+NFC encrypted transaction data through the Bluetooth link to the accessory device for relay to the another NFC enabled communication device.

3. The mobile terminal of claim 1 , wherein the processor is further configured to command the accessory device to proxy communications between the mobile terminal and the another NFC enabled communication device.

4. The mobile terminal of claim 3 ,

wherein the wireless network link comprises a Bluetooth link, and

wherein the processor is further configured to command the accessory device to forward a first data received via the Bluetooth link from the mobile terminal to the another NFC enabled communication device via a NFC link between the accessory device and the another NFC enabled communication device, and to forward a second data received via the NFC link from the another NFC enabled communication device to the mobile terminal via the Bluetooth link.

5. The mobile terminal of claim 4 , wherein the processor is further configured to command the accessory device to not perform NFC encryption of the first data received via the Bluetooth link from the mobile terminal before transmission via the NFC link to the another NFC enabled communication device.

6. The mobile terminal of claim 1 , wherein the wireless network link comprises a Bluetooth link, and wherein the wireless network circuit comprises a Bluetooth circuit configured to transmit combined Bluetooth+NFC encrypted transaction data by performing operations comprising:

converting the combined Bluetooth+NFC encrypted transaction data to a Bluetooth analog signal;

modulating the Bluetooth analog signal with a Bluetooth carrier signal to generate a Bluetooth output signal; and

transmitting the Bluetooth output signal via a Bluetooth antenna through the Bluetooth link to the accessory device.

7. The mobile terminal of claim 6 , wherein

the NFC circuit is further configured to:

convert the NFC encrypted transaction data to an NFC analog signal;

modulate the NFC analog signal with an NFC carrier signal to generate an NFC output signal; and

transmit the NFC output signal via an NFC antenna through a NFC link while the Bluetooth output signal is being transmitted by the Bluetooth circuit through the Bluetooth link to the accessory device.

8. The mobile terminal of claim 1 , wherein the wireless network circuit comprises a Bluetooth circuit, and wherein:

the NFC circuit is further configured to output the NFC encrypted transaction data as a digital serial stream to the Bluetooth circuit.

9. The mobile terminal of claim 1 , wherein the NFC circuit is configured to be selectively disabled from transmitting the NFC encrypted transaction data through an NFC antenna.