Device for authenticating wanted NFC interactions

1. A system for activating an NFC device, comprising:

a sensor module, configured to receive an input signal, wherein the input signal is generated by a user contact with an electronic device; and

a measuring module, configured to:

measure the strength of the input signal;

determine whether the input signal meets a predefined threshold;

activate the NFC device included within the electronic device when the input signal meets a predefined threshold; and

deactivate the NFC device when the input signal does not meet the predefined threshold, and

wherein communication between the NFC device and another NFC device only occurs when the input signal generated by the user contact meets the predefined threshold.

2. The system of claim 1 , wherein the measuring module is further configured to activate a tag mode on the NFC device.

3. The system of claim 1 , wherein the measuring module is further configured to deactivate a tag mode on the NFC device.

4. The system of claim 1 , further comprising:

a plurality of casings, wherein each casing includes the sensor module.

5. The system of claim 1 , wherein the sensor module is a resonance device that includes an oscillating circuit and the measuring module includes a frequency detection module.

6. The system of claim 5 , wherein the resonance device includes a conductive ink.

7. The system of claim 5 , wherein the resonance device includes a printed circuit board (PCB).

8. The system of claim 1 , wherein the sensor module is a pressure sensor and the measuring module is a resistance measuring module.

9. The system of claim 1 , further comprising a light source configured to emit light and wherein the measuring module is a photodetector.

10. The system of claim 1 , wherein the measuring module is a frequency detection module that measures the change in the frequency emitted by an antenna module.

11. The system of claim 1 , wherein the sensor module includes a conductive surface and wherein the measuring module is an RF circuit.

12. A computer-implemented method for activating an NFC device comprising:

sensing an input signal, wherein the input signal is generated by a user contact with an electronic device;

measuring the strength of the input signal;

determining whether the strength of the input signal meets a predefined threshold;

activating the NFC device that is included within an electronic device when the input signal meets the predefined threshold; and

deactivating the NFC device when the input signal does not meet the predefined threshold, and

wherein communication between the NFC device and another NFC device only occurs when the input signal generated by the user contact meets the predefined threshold.

13. The method of claim 12 , further comprising sensing a plurality of input signals from a plurality of casings attached to the electronic device.

14. The method of claim 12 , wherein the activating further comprises activating a tag mode on the NFC device.

15. The method of claim 12 , wherein the deactivating further comprises deactivating a tag mode on the NFC device.

16. The method of claim 12 , wherein the measuring further comprises measuring a change in frequency.

17. The method of claim 12 , wherein the sensing further comprises sensing a change in a tuning element.

18. The method of claim 12 , wherein the measuring further comprises measuring resistance of an electric circuit.

19. The method of claim 12 , wherein the sensing further comprises sensing pressure on a casing of the electronic device.

20. The method of claim 12 , wherein the sensing further comprises sensing a light reflected from a light source.

21. The method of claim 12 , wherein the measuring further comprises measuring the rate of reflection of a light reflected from a light source.

22. A non-transitory computer readable medium having instructions retrieved thereon that, when executed by a computing device, cause the computing device to perform operations for activating an NFC device comprising:

sensing an input signal, wherein the input signal is generated by a user contact with an electronic device;

measuring the strength of the input signal;

determining whether the strength of the input signal meets a predefined threshold;

activating the NFC device that is included within the electronic device when the input signal meets the predefined threshold; and

deactivating the NFC device when the input signal does not meet the predefined threshold, and

wherein communication between the NFC device and another NFC device only occurs when the input signal generated by the user contact meets the predefined threshold.

23. A system for activating an NFC device, comprising:

a plurality of sensor modules that include a conductive material on a plurality of casings on an electronic device, wherein each sensor module is configured to receive an input signal, the input signal is generated by a user contact with conductive material on each casing;

an insulating material that surrounds each sensor module; and

a measuring module, configured to:

measure the strength of the input signal;

determine whether the input signal meets a predefined threshold;

activate the NFC device included within the electronic device when the input signal meets a predefined threshold when contact with the electronic device occurs; and

deactivate the NFC device when the input signal does not meet the predefined threshold,

wherein communication between the NFC device and another NFC device only occurs when the input signal generated by the user contact meets the predefined threshold.

24. The system of claim 23 , wherein at least two of the sensor modules are in parallel and each sensor module senses shorting when contact occurs with the electronic device on each casing that includes the respective sensor module.

25. The system of claim 23 , wherein the measuring module is an ohmmeter.