# Patent

## Title
Apparatus for prevention of reading of magnetic cards

## Abstract

A card reading machine includes a card reader for reading data on a magnetic card and a device for preventing reading of the data on the magnetic card by illegal card reading devices operatively associated with the card reading machine. The device for preventing may include an oscillator, a driver circuit and a coil for generating electromagnetic signals similar to data on a card. A method for preventing reading of data on a magnetic card by in illegal card reader in operative association with an apparatus having a card reader intended to read the data on the magnetic card includes producing a signal ruining the data collected by the illegal card reader. The apparatus having a card reader may include an insertion slot in which case the method may further include producing the signal near the insertion slot.

## Background
TECHNICAL FIELD
This invention is regarding prevention of reading of cards with a magnetic stripe by undesired people.
Some people with bad intentions read the information on the stripes of magnetic cards belonging to clients at automated teller machines (ATM) owned by banks and accessible for utilization by banks' clients by reading them by means of a device (card reader) that they stick in the card insertion slot of an ATM machine and store this information, and afterwards copy this information onto another card and can Access clients' accounts and this process continues until it is noticed or the account is depleted. Our invention has been designed to prevent this situation, and to prevent banks and banks' clients from suffering from a loss.
For this purpose, to prevent the electronic card fastened by sticking in the card insertion slot of an automated teller machine by people with bad intentions from accurately reading and consequently recording, that is, for the purpose of ensuring that the reader makes errors during the reading process, near where this device can possibly be installed, a coil with a ferrite core is placed and signals similar to the data on a card but self-repeating are formed around this coil. As the reader cannot precisely read the data on a card, it will not be able to record, and people with bad intentions will not capture the data on the magnetic card.



BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 shows the block diagram of the invention.
FIG. 2 shows the way that a regular ATM machine operates as a block.
FIG. 3 shows positioning of the illegal copying device.
FIG. 4 is the illustration of the way in which the device is connected to an ATM machine.



DESCRIPTION OF INVENTION
The purpose of this invention is to prevent reading of cards with a magnetic stripe in the restricted area. For this purpose, the block diagram in FIG. 1 is made.
In order to attain this purpose, it is required that an electromagnetic field be created around an inductive charge (4).
For this electromagnetic field to be created, the electronic circuit made needs to have a power input (10) and this power input should be regulated in line with the required voltage values. +12V (2) and +5V (3) are the regulating circuits. For ruining the data obtained by the card reading device during reading, the electromagnetic field required to be formed needs to be in certain frequencies. This frequency is obtained at oscillator A (6). Conveying frequency is produced at oscillator B (5). It is conveyed to coil L1 (4) over the driver circuit (9) and it spreads from here as electromagnetic wave. If coil L1 (4) is removed from its setting, this is noticed through the feedback (8) path and the control output (7) is positioned as an abnormal situation indicator. The same situation also applies to power input (10). If power input (10) is interrupted for some reason, the power circuit (1) will not operate and the control output (7) will be in abnormal status.
As this device can be utilized anywhere, it is actually designed to be utilized in ATM's. Its connection to ATM's will be described below.
The card reader (13) circuit obtains the power that is needed for it to operate from the power supply (11) unit; and when a card comes to the card insertion slot (14), the card reader (13) unit reads and evaluates the data on this card and communicates them to the computer (15) in the ATM. There are no problems as far as here. The problem will start when another card reader (16) is installed in front of the card insertion slot (14) and on the exterior surface of the ATM device.
As it is required that the card desired to be inserted into the card insertion slot (14) pass through the illegal card reader (16), the data 5 on the card will be read and stored by the illegal card reader (16) also. This is an undesired situation. To prevent this, a coil (17) is placed immediately underneath the card insertion slot (14). The coil's forming an electromagnetic field in the way desired is attained. The process of operating this coil performed by the device (12). The device (12) obtains its power from the ATM power supply (10) (11), and ensures that the card reader unit (13) is also fed. If there is a problem in the coil (17) or the power supply (11), the card reader unit (13) will not operate and as it will not be possible for the card to enter the card insertion slot (14), as the card will not pass through the illegal card reader, no data will be read and it will not be able to perform recording. If there is no problem whatsoever with the power supply or the other elements, in this case, due to the electromagnetic field spread by the coil (17), the illegal card reader will not be able to perform reading and as a result will not be able to record the data on a card that passes through it.

## Claims

1. A card reading machine comprising:
a card reader for reading data on a magnetic card; and
a device for preventing reading of the data on the magnetic card by an illegal card reading devices operatively associated with the card reading machine,
wherein the device for preventing reading comprises a coil for generating signals when the magnetic card is passed along the illegal card reading device, the signals being so similar in frequency range to signals generated by the magnetic card being passed along the illegal card reading device, that coil generated signals and signals generated by the magnetic card being passed along the illegal card reading device create combined signals from which the coil generated and the passing of the magnetic card generated signals cannot in practice be filtered from each other.

2. The card reading machine of claim 1, wherein the device for preventing reading further comprises an oscillator and a driver circuit, wherein the oscillator, the driver circuit and the coil produce the signals similar in frequency range to signals generated by the magnetic card being passed along the illegal card reading device.

3. The card reading machine of claim 1, further comprising a card insertion slot for receiving the magnetic card in operative association with the card reader, the device preventing reading providing an electromagnetic field combining with the signals generated by the magnetic card being passed along the illegal card reading device operatively associated with the insertion slot.

4. The card reading machine of claim 3, wherein the device preventing reading further comprises an oscillator and a driver circuit.

5. The card reading machine of claim 4, wherein the signals generated by the coil are self-repeating.

6. The card reading machine of claim 4, further comprising a control operatively associated with the coil to indicate an abnormal situation if the coil is removed.

7. The card reading machine of claim 6, further comprising the control indicating an abnormal situation if power to the coil is interrupted.

8. The card reading machine of claim 7, further comprising the control disabling the power circuit.

9. The card reading machine of claim 6, wherein the operative association between the coil and the control is provided by a feedback path.

10. The card reading machine of claim 4, wherein the coil is placed near the insertion slot.

11. The card reading machine of claim 1, wherein the card reading machine is an automated teller machine.

12. The card reading machine of claim 1, wherein the magnetic card comprises a magnetic stripe on the card.

13. A device for preventing reading of data on a magnetic card by an illegal card reading device at a card reading machine, the device comprising means for providing an electromagnetic field ruining the data obtained by the illegal card reader, wherein the means for providing the electromagnetic field comprises a coil for generating signals so similar in frequency range to signals generated by the magnetic card being passed along the illegal card reading device that coil generated signals and signals generated by the magnetic card being passed along the illegal card reading device create combined signals from which the coil generated and the passing of the magnetic card generated signals cannot in practice be filtered from each other.

14. The device of claim 13, wherein the means for providing the electromagnetic field further comprises an oscillator and a driver circuit.

15. The device of claim 14, further comprising a power input, a control and a control output.

16. The device of claim 15, further comprising a feedback path from the coil to the control, wherein the control output is positioned as an abnormal situation indicator if the coil is removed.

17. The device of claim 16, wherein the control output is positioned as an abnormal situation indicator if power to the device is interrupted.

18. A method of preventing reading of data on a magnetic card by an illegal card reader in operative association with an apparatus having a card reader intended to read the data on the magnetic card, the method comprising:
producing a signal ruining the data collected by the illegal card reader,
wherein the signal so similar in frequency range to signals generated by the magnetic card being passed along the illegal card reading device that coil generated signals and signals generated by the magnetic card being passed along the illegal card reading device create combined signals from which the coil generated and the passing of the magnetic card generated signals cannot in practice be filtered from each other.

19. The method of claim 18, wherein the apparatus having a card reader intended to read data on a magnetic card comprises an insertion slot for the magnetic card, the method further comprising:
producing the signal near the insertion slot.

20. The method of claim 18, wherein the signal produced is self-repeating.