Method for generating a protective electromagnetic field for a card reading device
View Patent ↗The invention describes a device for a self-service terminal which contains a card reading device, for preventing the possibility of data on a card which is to be read by the card reading device 10 being spied-out by means of a spying-out apparatus which is installed in the vicinity of the card reading device 10 . The device comprises a protection apparatus 26 for generating a protective electromagnetic field which is suitable for impairing the functioning of the spying-out apparatus. The protection apparatus is controlled by a control unit 24 of the card reading device, which control unit also controls a card transportation apparatus 18 and/or a reading apparatus 20, 22 of the card reading device, such that the protective field is changed during reading of the card in the card reading device 10 such that it is ensured that reading of the card in the card reading device 10 is not impaired.
1. A card reading device for preventing data from being read from a magnetic strip card by a spying-out device installed proximate to the card reading device by a third party with fraudulent intent comprising:
a protective field generator and an inductor for generating a protective electromagnetic field that is operable to impair the spying-out device;
a reading head for reading the magnetic strip card; and
a control unit for controlling at least one of the protective field generator, a card transportation apparatus, and the reading head, the control unit modifies the protective electromagnetic field when the card is read by the card reading device to prevent the card reading device from being impaired by the protective electromagnetic field.
2. The device of claim 1 , wherein the protective electromagnetic field is switched off when the card is being read by the card reading device.
3. The device of claim 1 , wherein the control unit controls the protective field generator such that the protective electromagnetic field is modified only when part of a magnetic track of the card is within the card reading device.
4. The device of claim 1 , wherein the control unit reestablishes the protective electromagnetic field after the card is read by the card reading device.
5. The device of claim 1 , wherein the protective field generator is within a housing of the card reading device.
6. The device of claim 5 , wherein the inductor is integrated in one of a mouthpiece and a cover mounted at an exterior of the housing.
7. The device of claim 6 , wherein at least one of the mouthpiece and the cover includes plastic.
8. The device of claim 7 , wherein the inductor is encapsulated in one of the mouthpiece and the cover.
9. The device of claim 1 , wherein the protective electromagnetic field is an alternating electromagnetic field with a frequency of from 20 to 50 kHz.
10. The device of claim 1 , further comprising a sensor system that is operable to identify the presence of the spying-out device.
11. The device of claim 10 , wherein the sensor system comprises a metal detector operable to identify metallic components of the spying-out device.
12. The device of claim 11 , wherein the metal detector is connected to a first inductor for generating a primary electromagnetic field and a second inductor for detecting a secondary electromagnetic field that is modified by interaction of the primary electromagnetic field with metallic components of the spying-out device.
13. The device of claim 1 , wherein the control unit instructs the protective field generator to reestablish the protective electromagnetic field before a magnetic track of the card has completely exited the card reading device.
14. The device of claim 1 , wherein the protective electromagnetic field is an alternating electromagnetic field with a frequency of from 40 to 50 kHz.