JPH11328507A - Prepaid card system, recorder, reader/writer, ticket issuing machine and illegal card use prevention method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the use of an illegal card by forgery such as copying. SOLUTION: A recorder marks a flaw imparting part E2 at the time of issuing a prepaid card 6, performs magnetic detection with the flaw imparting part E2, quantizes a detected magnetic waveform, enciphers card information with quantization information as a key and records it in a card information storage part E1. At the time of using the prepaid card 6, a reader/writer performs the magnetic detection with the flaw imparting part E2, decodes the enciphered card information recorded in the card information storage part E1 with the quantization information obtained by quantizing the detected magnetic waveform as a key and updates the card information in accordance with the amount of consumed money or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prepaid card system, a recording device, a reading device, a ticket issuing machine, and a method for detecting an unauthorized card, which prevents use of an unauthorized card due to forgery of copying or the like.

[0002]

2. Description of the Related Art A prepaid card system has been realized in which a prepaid card storing money amount information having a monetary value is used to pay for a rental of a game medium or the like. The prepaid card system includes, for example, a recording device installed at a card issuer, a ticket issuing machine installed at each store, a reading device, and the like. The recording device records (encodes) initial information including a card ID, a face value, and the like on the prepaid card. The prepaid card on which the initial information is recorded is sold to each store from the card issuer, for example.

In each store, for example, a prepaid card purchased from a card issuer is stored in a ticket issuing machine. The ticketing machine is
In response to a prepaid card purchase request from the user, the prepaid card stored therein is taken out, and predetermined information such as a ticketing date is recorded and a ticket is issued. The issued prepaid card is used by a user, for example, in a reading device at a store. The reading device confirms that the inserted prepaid card is usable, for example, by checking the balance, and then, according to the amount of payment (consumption amount), information on the amount of money or the like recorded on the prepaid card. Record and discharge.

[0004]

However, in such a system as described above, data of an unused prepaid card is copied to a used prepaid card whose balance has been exhausted (that is, the balance has become zero yen). There is a possibility that a fraudulent act of forging a fraudulent card and attempting to use it again will be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has a prepaid card system, a recording device, a reading device, a ticket issuing machine, and a device for preventing use of an illegal card which can prevent use of an illegal card due to forgery of copying or the like. The aim is to provide a method.

[0006]

In order to achieve the above object, a prepaid card system according to a first aspect of the present invention comprises: a recording device for recording card information including money information on a prepaid card; A reading device that processes a prepaid card on which predetermined information is recorded by the recording device, and a prepaid card system, wherein the prepaid card system includes a flaw applying means for flawing a predetermined area of the prepaid card, A first reading unit that magnetically reads the predetermined area of the prepaid card; a first quantization unit that quantizes a magnetic waveform read by the first reading unit; The card information is encrypted by using the information of the magnetic waveform quantized by the first quantizing means as a key, and Recording means for recording in the read information recording area, wherein the reading device magnetically reads the predetermined area of the prepaid card to be processed, and the reading apparatus reads the predetermined area. A second quantizing means for quantizing the magnetic waveform, and an encryption recorded in the card information recording area of the prepaid card, using information of the magnetic waveform quantized by the second quantizing means as a key. Decrypting means for decrypting the obtained card information, updating means for updating the card information decrypted by the decrypting means according to a consumption amount, and updating the card information by the updating means. Means for encrypting the quantized magnetic waveform information as a key and recording the encrypted information in the card information recording area.

According to such a configuration, for example, the recording device scratches a predetermined area of the prepaid card, and the information (quantized information) obtained by quantizing the magnetic waveform detected for the area is used as a key to generate card information ( Information, etc.) is recorded in an encrypted form. The reading device decrypts the encrypted card information using information obtained by quantizing a magnetic waveform detected in a predetermined area of the set prepaid card as a key, updates the card information in accordance with the amount of money consumed, etc. Encrypted information is used as a key and recorded. Generally, when a prepaid card is read by a magnetic head or the like, noise or the like is detected. The detected noise varies from card to card, but since the amplitude is small, it is difficult to identify the card using the noise. However, in the present system, by damaging the card by the flaw applying means, the amplitude of the detected magnetic waveform can be further increased, and the difference between the magnetic waveforms in each card can be clarified. For this reason,
The quantization information used for encrypting the card information in the recording device is substantially unique for each prepaid card.
Therefore, for example, even if a fraudulent card in which data of an unused prepaid card has been copied is set in a reading device on a used prepaid card having no balance, the encrypted card information cannot be decrypted, Use of the unauthorized card can be prevented.

The flaw applying means may further comprise means for flawing the predetermined area of the prepaid card by rotating a roller provided with a scratch portion for flawing the surface of the prepaid card.

Further, a prepaid card system according to a second aspect of the present invention is provided with a recording device for recording card information including money amount information on a prepaid card having a predetermined area with a flaw, and disposed in each store. A reading device for processing a prepaid card on which predetermined information is recorded by a recording device, wherein the recording device comprises: a first reading means for magnetically reading the predetermined area of the prepaid card; A first quantizing means for quantizing a magnetic waveform read by the first reading means, and encrypting the card information by using information of the magnetic waveform quantized by the first quantizing means as a key, Recording means for recording the information in a card information recording area of the prepaid card, wherein the reading device reads the predetermined value of the prepaid card to be processed. Second reading means for magnetically reading an area, second quantizing means for quantizing a magnetic waveform read by the second reading means, and magnetic field quantized by the second quantizing means. Using the information of the waveform as a key, decryption means for decrypting the encrypted card information recorded in the card information recording area of the prepaid card, and decryption by the decryption means according to the consumption amount Updating means for updating the card information; and means for encrypting the card information updated by the updating means using the quantized magnetic waveform information as a key and recording the encrypted information in the card information recording area. .

In the prepaid card system according to the first and second aspects, the reading device determines whether or not the result of decryption by the decryption means is appropriate. The apparatus may further include a determination unit that identifies the target card as an unauthorized card and prohibits use of the card.

A recording device according to a third aspect of the present invention is a recording device for issuing a prepaid card used in a prepaid card system, wherein the reading device magnetically reads a predetermined area of the prepaid card. Means, a quantizing means for quantizing the magnetic waveform read by the reading means, and an encrypting means for encrypting card information including money amount information using information of the magnetic waveform quantized by the quantizing means as a key. And recording means for recording the card information encrypted by the encryption means in a card information recording area of the prepaid card.

The recording apparatus may further include a flaw applying means for applying flaws to the predetermined area of the prepaid card prior to the magnetic reading by the reading means.

A reading device according to a fourth aspect of the present invention uses a key as quantization information obtained by quantizing a magnetic waveform detected by magnetically reading a predetermined area having a flaw. A reading device for processing a prepaid card in which card information including amount information is encrypted and recorded in a card information recording area, wherein the reading unit magnetically reads the predetermined area of the prepaid card to be processed Means, a quantizing means for quantizing a magnetic waveform read by the reading means, and information of the magnetic waveform quantized by the quantizing means recorded as a key in the card information recording area of the prepaid card. Decrypting means for decrypting the encrypted card information, and updating the card information decrypted by the decrypting means according to the consumption amount. And means, said card information updated by said updating means, encrypts information of the quantized magnetic waveform as a key, and means for recording the card information recording area.

According to such a configuration, a card including money amount information is used as a key with quantized information obtained by quantizing a magnetic waveform detected by magnetically reading a predetermined area having a flaw. When the information is encrypted and the prepaid card recorded in the card information recording area is used, the reading device quantizes the information obtained by quantizing the magnetic waveform detected in the predetermined area of the set prepaid card. , The encrypted card information is decrypted and updated. Generally, when a prepaid card is read by a magnetic head or the like, noise or the like is detected. The detected noise varies from card to card, but since the amplitude is small, it is difficult to identify the card using the noise. However, by damaging the card, it is possible to increase the amplitude of the detected magnetic waveform and to clarify the difference between the magnetic waveforms in each card. For this reason, the quantization information used for encrypting the card information is substantially unique for each prepaid card. Therefore, for example, when a fraudulent card in which data of an unused prepaid card is copied is used for a used prepaid card that has run out of balance, the encrypted card information cannot be decrypted in the reading device. , The use of the unauthorized card can be prevented.

The reading device determines whether or not the result of decryption by the decryption means is proper. If the result of the determination is improper, the reading device identifies the prepaid card to be processed as an unauthorized card and prohibits use. Means may be further provided.

The ticket issuing machine according to a fifth aspect of the present invention uses a key as quantization information obtained by quantizing a magnetic waveform detected by magnetically reading a predetermined area having a flaw. A ticket issuing machine for issuing a prepaid card in which card information including amount information is encrypted and recorded in a card information recording area, wherein the storage means stores a prepaid card to be issued; and the storage means Reading means for taking out the prepaid card stored in the prepaid card and magnetically reading the predetermined area of the prepaid card; a quantizing means for quantizing a magnetic waveform read by the reading means; and Using the quantized magnetic waveform information as a key, the encrypted card information recorded in the card information recording area of the prepaid card is Decryption means for encrypting, and the card information decrypted by the decryption means, including predetermined ticketing information, encrypting the quantized magnetic waveform information as a key, and recording in the card information recording area Means.

According to such a configuration, a card including money amount information is used as a key with quantized information obtained by quantizing a magnetic waveform detected by magnetically reading a predetermined area having a flaw. When the information is encrypted and the prepaid card recorded in the card information recording area is issued, the ticketing machine uses the information obtained by quantizing the magnetic waveform detected in the predetermined area of the set prepaid card as a key. Then, the encrypted card information is decrypted and a predetermined ticket issuing process is performed. Generally, when a prepaid card is read by a magnetic head or the like, noise or the like is detected.
The detected noise varies from card to card, but since the amplitude is small, it is difficult to identify the card using the noise. However, for example, by damaging the card by the scratch applying means, it is possible to further increase the amplitude of the detected magnetic waveform and to clarify the difference in the magnetic waveform in each card. For this reason, the quantization information used for encrypting the card information is substantially unique for each prepaid card. Therefore, for example, when a fraudulent card in which data of an unused prepaid card is copied to a used prepaid card with no balance left is set in the ticketing machine as a card to be issued, in the ticketing machine,
Since the encrypted card information cannot be decrypted, ticketing of the unauthorized card can be prevented.

The ticketing machine determines whether or not the decryption result by the decryption means is proper. If it determines that the result is inappropriate, the ticketing machine identifies the prepaid card to be processed as an unauthorized card and prohibits ticketing. Means may be further provided.

Further, a method for preventing unauthorized card use according to a sixth aspect of the present invention includes a recording device for recording predetermined information on a prepaid card, and a prepaid card arranged at each store and recording the predetermined information by the recording device. A method for preventing unauthorized use of a card in a system including a reading device for processing a card, wherein a scratching step of scratching a predetermined area of the prepaid card; and A first reading step of reading the data, a first quantization step of quantizing the magnetic waveform read by the first reading step,
A recording step of encrypting card information by using the information of the magnetic waveform quantized by the first quantization step as a key and recording the card information in a card information recording area of the prepaid card; A second reading step of magnetically reading the predetermined area of the prepaid card to be processed, a second quantization step of quantizing a magnetic waveform read by the second reading step, and Using the information of the magnetic waveform quantized by the quantization step as a key, a decryption step of decrypting the encrypted card information recorded in the card information recording area of the prepaid card, Updating the card information decrypted by the decrypting step; updating the card information by the updating step The card information, and encrypts information of the quantized magnetic waveform as a key, and a step of recording the card information recording area.

The method for preventing unauthorized card use determines whether or not the decryption result in the decrypting step is proper. If it is determined that the result is incorrect, the prepaid card to be processed is identified as a fraudulent card, and its use is determined. May be further provided.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A prepaid card system according to an embodiment of the present invention will be described below with reference to the drawings. This prepaid card, as shown in FIG.
It includes a recording device 1, a ticket issuing machine 2, a reading device 3, a relay device 4, a center 5, and the like. The recording device 1 and the center 5 are installed at the card issuer, and the ticket issuing machine 2, the reading device 3, and the relay device 4 are installed at each store.

As shown in FIG. 2, the prepaid card 6 used in the present system includes a card information storage unit E1 in which predetermined card information (for example, card ID, face value, issue date, balance, etc.) is recorded. And a flaw applying section E2 to which flaws are applied by the recording apparatus 1.

The recording device 1 is a device for recording and issuing card information on a prepaid card 6 at a card issuer. As shown in FIG. 3, the recording apparatus 1 includes a card transport unit 11, a card reading unit 13, and a scratching roller 1.
5, a control unit 17, and a storage unit 19.

The card transport section 11 transports the prepaid card 6 inserted into a reception port (not shown) and supplies it to the card reading section 13 or the scratch applying roller 15. Card Reading Department 1
Reference numeral 3 includes a magnetic head and the like, and reads / writes data (magnetic information or magnetic noise) recorded on the prepaid card 6 supplied from the card transport unit 11 in accordance with an instruction from the control unit 17. Scratched roller 15
As shown in FIG. 4, for example, has a plurality of scratching sections for scratching the prepaid card 6, and in accordance with an instruction from the control section 17, a predetermined area of the prepaid card 6 supplied from the card transport section 11. Scratch.

The control unit 17 damages the flaw applying unit E2 of the prepaid card 6 to be issued via the flaw applying roller 15. After the scratching, the control unit 17 magnetically detects the scratching unit E2 of the prepaid card 6 via the card reading unit 13 as shown in FIG. 5, and as a result, detects the detected magnetic waveform. Is quantized. Next, the control unit 17 encrypts the card information read from the storage unit 19 using the information (quantized information) obtained by quantizing the magnetic waveform as an encryption key, and records it in the card information storage unit E1 of the prepaid card 6. I do.

The storage unit 19 stores card information and the like to be recorded on the prepaid card 6 to be issued.

The ticketing machine 2 stores a prepaid card 6 on which card information is recorded by the recording device 1, takes out the prepaid card 6 stored therein in response to a purchase request from a user, and performs a predetermined ticketing process. And discharge.

The reading device 3 is connected to, for example, a vending machine (not shown) for renting out game media and the like, accepts the prepaid card 6 on which ticketing processing has been performed by the ticketing machine 2, and allows the vending machine to use the user. Is a device for updating amount information and the like recorded on the prepaid card 6 in accordance with the value of the game medium lent to the company. The reading device 3 includes a data reading unit 31, a control unit 33, a storage unit 35, and a communication unit 37, as shown in FIG.

The data reading unit 31 includes a magnetic head or the like, and reads / writes data (significant magnetic information) from / to the prepaid card 6 inserted into a card insertion slot (not shown) according to an instruction from the control unit 33. Do.

The control unit 33 performs magnetic detection on the flaw applying unit E2 of the inserted prepaid card 6 via the data reading unit 31, and quantizes the detected magnetic waveform as a result. Next, the control unit 33 decrypts the encrypted card information recorded in the card information storage unit E1 of the prepaid card 6 using the information (quantized information) obtained by quantizing the magnetic waveform as a decryption key. I do. Next, the control unit 3
3 performs a predetermined check based on the card information and the like obtained by the decryption process. This check includes, for example, checking whether or not the card information is correctly decrypted, whether or not the balance in the card information is equal to or less than the face value. When an error is detected in this check, the control unit 33 recognizes the inserted card as an unauthorized card and executes a predetermined error process.

When all of the above checks are completed normally, the control unit 33 updates the balance in the decrypted card information according to the consumption amount, and responds to the discharge request of the prepaid card 6 and the like. Using quantization information as an encryption key,
The updated new card information is encrypted and recorded in the card information storage unit E1 of the prepaid card 6. At this time, the control unit 33 generates sales information including information such as a consumption amount and a use date, and accumulates and stores the sales information in the storage unit 35. Further, the control unit 33 transmits the sales information stored in the storage unit 35 to the communication unit 37.
To the relay device 4 at a predetermined timing through the relay device 4.

The storage unit 35 stores sales information and the like generated by the control unit 33 when the prepaid card 6 is used. The communication unit 37 controls communication between the reading device 3 and the relay device 4.

The relay device 4 collects and collects sales information and the like in each reading device 3 in the store, and transmits the collected information to the center 5 at a predetermined timing. The center 5 includes a computer or the like for controlling the entire system, and stores and manages sales information and the like received from the relay device 4 of each store.

In the present system, a predetermined area of the prepaid card 6 to be issued in the recording device 1 is damaged, and information obtained by quantizing a magnetic waveform magnetically detected in the predetermined area is stored in the prepaid card. It is used for encrypting card information recorded on the card 6. Generally, when the prepaid card 6 is read by a magnetic head or the like, noise or the like is detected. The detected noise varies from card to card, but since the amplitude is small, it is difficult to identify the card using the noise. However, in the present system, by damaging the card with the flaw applying roller 15, the amplitude of the detected magnetic waveform can be further increased, and the difference between the magnetic waveforms in each card can be clarified. For this reason, the quantization information recorded by the recording device 1 is substantially unique for each prepaid card 6.

Therefore, for example, when data of an unused card B is dead-copied to a used prepaid card A having a balance of 0 yen, the card A and the card B are attached to the scratch applying section E2. Since the scratches are different, the information obtained by quantizing the magnetic waveform detected from the scratch applying unit E2 in the copy destination card A is the encryption key (quantization) of the encrypted card information copied to the card A. Information). As a result, the reading device 3 on which the copy destination card A is set is recorded in the card information storage unit E1 with the information obtained by quantizing the magnetic waveform detected from the scratching unit E2 of the prepaid card 6 as a key. Even if the decrypted data is decrypted, the encrypted data cannot be restored. As a result, use of an unauthorized card due to dead copy or the like can be prevented. Further, for example, by not fixing the rotation start position of the flaw applying roller 15, the pattern of flaws applied to each prepaid card 6 can be made different.

Next, the operation of the recording device 1 and the reading device 3 which are characteristic portions of the present system will be described. First, the operation of the recording apparatus 1 will be described with reference to the flowchart in FIG. The recording device 1 removes the prepaid card 6 stored in the storage unit (not shown) in response to, for example, an external issuance instruction of the prepaid card 6, and rotates the flaw applying roller so that the flaw applying unit E2 of the card is damaged. (Step S11). At this time, for example, in order to make the pattern of the flaw applied to the card unique for each card, the rotation start position of the flaw applying roller 15 is not fixed. Next, the recording device 1 performs magnetic detection on the flaw applying section E2 of the prepaid card 6 (step S12), and quantizes the detected magnetic waveform (step S13). The recording device 1 encrypts the card information including the card ID, the bill amount, the issue date, and the like using the quantization information obtained by the quantization of the magnetic waveform as a key, and stores the card information in the card information storage unit E of the prepaid card 6
1 (step S14).

In this way, the prepaid card 6 on which the encrypted card information is recorded is issued. The issued prepaid card 6 is supplied to each store, stored in the ticket issuing machine 2 in the store, and provided to the user in response to a purchase request.

Next, the operation of the reading device 3 when the user uses the prepaid card 6 will be described with reference to the flowchart of FIG. For example, the user inserts the prepaid card 6 into the card slot of the reading device 3 in order to use it. In response to this, the reading device 3 performs magnetic detection on the flaw applying portion E2 of the inserted prepaid card 6 via the data reading portion 31 (step S2).
1). Next, the reading device 3 quantizes the magnetic waveform detected in step S21 (step S22). Next, the reader 3 reads the card information storage section E of the prepaid card 6.
The encrypted data recorded in No. 1 is read, and the data is subjected to a decryption process using the quantization information obtained by quantizing the magnetic waveform in step S22 as a decryption key (step S23).

Next, the reading device 3 determines whether or not the card information has been correctly decrypted based on the decrypted card information and the like obtained in step S23, and whether or not the balance in the card information is equal to or less than the face value. A predetermined check process such as whether or not is performed (step S24).

In the check processing of step S24,
If any of the check results result in an error, the reading device 3 recognizes the card as an unauthorized card and executes a predetermined error process such as turning on an error lamp (not shown) without returning the card. (Step S31).

In the check processing in step S24,
If all checks are completed successfully, the reading device 3
The balance or the like in the decrypted card information is updated according to the consumption amount (step S25). Next, the reading device 3
Is, for example, in response to a discharge request of the prepaid card 6,
An encryption process is performed on the updated new card information using the quantization information acquired in step S22 as a key (step S26). After the completion of the encryption processing in step S26, the reading device 3 records the encrypted card information in the card information storage unit E1 of the prepaid card 6 (step S27). In addition, the reading device 3 has a
Sales information including information such as the date of use is generated and stored in the storage unit 35 (step S28), the prepaid card 6 is ejected (step S29), and the process is terminated.

As described above, the reading device 3 performs magnetic detection on the scratched portion E2 of the inserted prepaid card 6, and uses the quantized information obtained by quantizing the detected magnetic waveform as a key to obtain a card. The information is encrypted and recorded in the card information storage unit E1. As described above, since the quantization information, which is a key used for encrypting the data in the card information storage unit E1 of the prepaid card 6, differs for each card, for example, the used prepaid card 6 having a balance of 0 yen is used. ,
When an unauthorized card in which data of the unused prepaid card 6 is copied is used, the reading device 3 uses the quantized information obtained by quantizing the magnetic waveform of the card and the quantized information used for encrypting the card information. Since the quantization information, which is the encryption key, does not match, the illegality can be easily detected.

Further, the ticket issuing machine 2 performs magnetic detection on the scratch applying section E2 on the prepaid card 6 to be issued, similarly to the reading device 3, and quantizes the detected magnetic waveform. The data in the card information storage unit E1 is decrypted using the obtained quantization information as a key, the decrypted card information includes predetermined ticketing information, and is encrypted using the quantization information as a key. You may record and issue a ticket.

Also, this prepaid card system,
The prepaid card is not limited to a system used for paying for a game medium or the like, and can be applied to various uses.

The timing at which the card is scratched is not limited to the above embodiment. For example, before the encoding process in the recording device 1, the recording device 1 or another dedicated device may scratch each card in advance. In this case, in the encoding process, the recording device 1 detects and quantizes the flaw already applied to the card, and uses it as an encryption key for encrypting the card information.

In the above description, the flaw is applied only to the flaw applying part E2. However, the present invention is not limited to this. May be magnetically detected.

[0047]

As described above, according to the present invention,
For example, a recording device scratches a predetermined area of a prepaid card, and encrypts and records card information (money information and the like) using information (quantized information) obtained by quantizing a magnetic waveform detected for the area as a key. The reading device decrypts the encrypted card information using information obtained by quantizing a magnetic waveform detected in a predetermined area of the set prepaid card as a key, updates the card information in accordance with the amount of money consumed, etc. Encrypted information is used as a key and recorded.

Generally, when a prepaid card is read by a magnetic head or the like, noise or the like is detected. The detected noise varies from card to card, but since the amplitude is small, it is difficult to identify the card using the noise.
However, in the present system, by damaging the card by the flaw applying means, the amplitude of the detected magnetic waveform can be further increased, and the difference in the magnetic waveform in each card can be clarified. For this reason, the quantization information used to encrypt the card information in the recording device is substantially unique for each prepaid card. Therefore, for example, even if a fraudulent card in which data of an unused prepaid card has been copied is set in a reading device on a used prepaid card having no balance, the encrypted card information cannot be decrypted, Use of the unauthorized card can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration of a prepaid card system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a structure of a storage area of a prepaid card used in the prepaid card system of FIG. 1;

FIG. 3 is a block diagram schematically illustrating a configuration of a recording device used in the prepaid card system of FIG. 1;

FIG. 4 is a view for explaining a flaw applying roller.

FIG. 5 is a diagram for explaining encrypted card information recorded on a prepaid card by the recording device of FIG. 3;

FIG. 6 is a block diagram schematically illustrating a configuration of a reading device used in the prepaid card system of FIG. 1;

FIG. 7 is a flowchart for explaining the operation of the printing apparatus of FIG. 3;

FIG. 8 is a flowchart for explaining the operation of the reading device of FIG. 6;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 recording device 2 ticket issuing machine 3 reading device 4 relay device 5 center 6 prepaid card 11 card transport unit 13 card reading unit 15 scratching roller 17 control unit 19 storage unit 31 data reading unit 33 control unit 35 storage unit 37 communication unit

Claims (12)

[Claims] 1. A prepaid card comprising: a recording device for recording card information including money amount information on a prepaid card; and a reading device arranged at each store and processing a prepaid card on which predetermined information is recorded by said recording device. In the system, the prepaid card system includes a flaw applying unit that applies a flaw to a predetermined area of the prepaid card, wherein the recording device magnetically reads the predetermined area of the prepaid card, A first quantizing means for quantizing the magnetic waveform read by the first reading means, and encrypting the card information by using information of the magnetic waveform quantized by the first quantizing means as a key;
Recording means for recording in a card information recording area of the prepaid card, wherein the reading device magnetically reads the predetermined area of the prepaid card to be processed;
Second quantizing means for quantizing the magnetic waveform read by the reading means, and the card information recording area of the prepaid card using the magnetic waveform information quantized by the second quantizing means as a key. Decrypting means for decrypting the encrypted card information recorded in the storage means, updating means for updating the card information decrypted by the decrypting means in accordance with the amount of consumption, and updating by the updating means. Means for encrypting the card information using the quantized magnetic waveform information as a key, and recording the encrypted card information in the card information recording area. 2. The scratching means further comprises means for scratching the predetermined area of the prepaid card by rotating a roller provided with a scratch portion for scratching the surface of the prepaid card. The prepaid card system according to claim 1, characterized in that: 3. A recording device for recording card information including amount information on a prepaid card having a predetermined area with a flaw,
A reading device arranged at each store and processing a prepaid card on which predetermined information is recorded by the recording device, wherein the recording device magnetically reads the predetermined area of the prepaid card. A first reading unit, a first quantizing unit for quantizing a magnetic waveform read by the first reading unit, and information of the magnetic waveform quantized by the first quantizing unit as a key. Encrypt card information,
Recording means for recording in a card information recording area of the prepaid card, wherein the reading device magnetically reads the predetermined area of the prepaid card to be processed;
Second quantizing means for quantizing the magnetic waveform read by the reading means, and the card information recording area of the prepaid card using the magnetic waveform information quantized by the second quantizing means as a key. Decrypting means for decrypting the encrypted card information recorded in the storage means, updating means for updating the card information decrypted by the decrypting means in accordance with the amount of consumption, and updating by the updating means. Means for encrypting the card information using the quantized magnetic waveform information as a key and recording the encrypted card information in the card information recording area. 4. The reading device determines whether or not the result of the decryption by the decryption means is proper. If the result of the determination is incorrect, the reading device identifies the card to be processed as an unauthorized card and prohibits use. The prepaid card system according to any one of claims 1 to 3, further comprising means. 5. A recording device for issuing a prepaid card used in a prepaid card system, comprising: reading means for magnetically reading a predetermined area of the prepaid card; and a magnetic waveform read by the reading means. Quantizing means for quantizing; encrypting means for encrypting card information including money amount information using magnetic waveform information quantized by the quantizing means as a key; card information encrypted by the encrypting means Recording means for recording in a card information recording area of the prepaid card. 6. The recording apparatus according to claim 5, wherein the recording apparatus further comprises a flaw applying means for applying flaws to the predetermined area of the prepaid card prior to the magnetic reading by the reading means. Recording device. 7. Card information including amount information is encrypted using quantization information obtained by quantizing a magnetic waveform detected by magnetically reading a predetermined area having a flaw as a key, A reading device for processing a prepaid card recorded in a card information recording area, comprising: reading means for magnetically reading the predetermined area of the prepaid card to be processed; and a magnetic waveform read by the reading means. Quantizing means for quantizing, and decrypting the encrypted card information recorded in the card information recording area of the prepaid card, using the information of the magnetic waveform quantized by the quantizing means as a key. Decrypting means, updating means for updating the card information decrypted by the decrypting means in accordance with the consumption amount, and updating by the updating means The serial card information, encrypts information of the quantized magnetic waveform as the key, reading apparatus characterized by comprising, a means for recording the card information recording area. 8. The reading device determines whether or not the decryption result by the decryption means is proper. If the decryption result is inappropriate, the reading device identifies the prepaid card to be processed as an unauthorized card and prohibits use. The reading device according to claim 7, further comprising a determination unit that performs the determination. 9. Card information including amount information is encrypted using quantization information obtained by quantizing a magnetic waveform detected by magnetically reading a predetermined area having a flaw as a key, A ticket issuing machine for issuing a prepaid card recorded in a card information recording area, comprising: storage means for storing a prepaid card to be issued; and taking out the prepaid card stored in the storage means; Reading means for magnetically reading the predetermined area of the card; quantizing means for quantizing a magnetic waveform read by the reading means; and information on the magnetic waveform quantized by the quantizing means as a key. Decoding means for decoding the encrypted card information recorded in the card information recording area of the prepaid card; Ticketing means for including predetermined ticketing information in the decrypted card information, encrypting the quantized magnetic waveform information as a key, and recording the information in the card information recording area. Ticketing machine. 10. The ticketing machine determines whether or not the decryption result by the decryption means is proper. If the result is incorrect, the ticketing machine identifies the prepaid card to be processed as an unauthorized card and prohibits ticketing. The ticket issuing machine according to claim 9, further comprising a determination unit that performs the determination. 11. Prevention of unauthorized use of a card in a system including a recording device for recording predetermined information on a prepaid card, and a reading device disposed at each store and processing a prepaid card on which the predetermined information is recorded by the recording device. A method of applying a flaw to a predetermined area of the prepaid card, a first reading step of magnetically reading the predetermined area of the prepaid card in the recording device, and a first reading step. A first quantization step of quantizing the read magnetic waveform; and card information encryption using the information of the magnetic waveform quantized in the first quantization step as a key, and a card information recording area of the prepaid card. A recording step of recording on the reading device, when using the prepaid card,
A second reading step of magnetically reading the predetermined area of the prepaid card to be processed, a second quantization step of quantizing a magnetic waveform read by the second reading step, and a second quantization step. Decrypting the encrypted card information recorded in the card information recording area of the prepaid card, using the information of the magnetic waveform quantized by the encrypting step as a key, An update step of updating the card information decrypted by the decryption step; and the card information updated by the update step,
Encrypting the quantized magnetic waveform information as a key,
Recording the information in the card information recording area. 12. The fraudulent card use prevention method, comprising: judging whether or not the decryption result in the decrypting step is proper; if determining that the result is incorrect, identifying the prepaid card to be processed as a fraudulent card; The method according to claim 11, further comprising a determining step of prohibiting the use of the card.