Interface deactivation for communication between electronic appliances

1. A method for controlling the flow of data in a near field communication appliance having an interposed element and a plurality of secure elements connected to the interposed element, the method comprising:

receiving a first communication, sent by an external appliance, which is intended for an application located in one of the secure elements;

determining whether a first one of the secure elements contains the application; and

deactivating an interface from the interposed element to the first secure element if the first secure element does not contain the application.

2. The method of claim 1 , wherein the first secure element begins communication with the external appliance if the first secure element contains the application.

3. The method of claim 1 , wherein the interposed element determines whether the first secure element contains the application, and wherein the interposed element forwards the first communication to a second one of the secure elements if the first secure element does not contain the application.

4. The method of claim 1 , wherein the interposed element deactivates the interface no later than after a defined time tInterface off if the first secure element does not contain the application.

5. The method of claim 1 , further comprising buffer-storing the first communication in the interposed element.

6. The method of claim 1 , further comprising beginning a transparent communication between the external appliance and the secure element which contains the application.

7. The method of claim 1 , wherein the external appliance is an NFC reader and the near field communication appliance is a mobile terminal with an NFC function.

8. The method of claim 1 , wherein the interposed element is an NFC frontend.

9. The method of claim 1 , further comprising measuring in order to prevent data collisions between the secure elements by using targeted power management.

10. The method of claim 1 , wherein the communication between the external appliance and the near field communication appliance is based on ISO 14443.

11. The method of claim 10 , wherein information at a level of ISO 14443 layer 3 is handled by one of the secure elements or by the interposed element.

12. A near field communication system, comprising:

a near field communication appliance, comprising:

a plurality of secure elements; and

an interposed element connected to the secure elements,

wherein the near field communication appliance is operable to:

receive a first communication, sent by an external appliance, which is intended for an application located in one of the secure elements;

determine whether a first one of the secure elements contains the application; and

deactivate an interface from the interposed element to the first secure element if the first secure element does not contain the application.

13. The near field communication system of claim 12 , wherein the first secure element is operable to begin communication with the external appliance if the first secure element contains the application.

14. The near field communication system of claim 12 , wherein the interposed element is operable to determine whether the first secure element contains the application and forward the first communication to a second one of the secure elements if the first secure element does not contain the application.

15. The near field communication system of claim 12 , wherein the interposed element is operable to deactivate the interface no later than after a defined time t Interface — off if the first secure element does not contain the application.

16. The near field communication system of claim 12 , wherein the near field communication appliance is further operable to buffer-store the first communication in the interposed element.

17. The near field communication system of claim 12 , wherein the near field communication appliance is further operable to begin a transparent communication between the external appliance and the secure element which contains the application.

18. The near field communication system of claim 12 , wherein the external appliance is an NFC reader and the near field communication appliance is a mobile terminal with an NFC function.

19. The near field communication system of claim 12 , wherein the near field communication system is a mobile terminal.