JPH05182034A - Forgery preventing method - Google Patents

Abstract

PURPOSE:To precisely prevent forgery by setting information obtained by means of continuously reading first information and second information, which are recorded in different areas, to be third information and setting information obtained in a state where at least one of first or second information is rewritten to be fourth information so as to execute a prescribed processing. CONSTITUTION:In a magnetic reader, the waveform of card characteristic information '1' and the waveform of '2' are synthesized as first information. Information by synthesized card characteristic information and user information (b) is set to be fourth information. Thus, a device where noise occurs cannot read card characteristic information and cash is not withdrawn. Namely, fourth information which is read differs in third information consisting of user information (b) being other's second information and card characteristic information '2' of first information, and in characteristic information as first information recorded in a first information recording area, and it discriminated to be fourth information. Thus, forgery is detected.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a forgery prevention method.

[0002]

2. Description of the Related Art In recent years,
Forgery crimes are occurring. For example, as magnetic cards such as cash cards and credit cards are widely used in the field of magnetic cards, crimes such as forgery and misuse of cards are also occurring. An example of the card forgery method in the case of a cash card is as follows. 1) Counterfeit Case 1 Magnetic recording medium for cash card (usually formed in stripes, commonly called magnetic stripe)
In, a bank code number, a deposit account number, and a personal identification number are magnetically recorded as user information. For example, a person who is involved in issuing a card can know the user information, so it is extremely easy to forge the card. That is, forgery can be easily performed by applying a card owned by the forger to the magnetic recording device to erase his or her own user information and newly magnetically recording the user information on the card of another person who is trying to forge. In this case, the card issuing person is responsible for the recording conditions such as the position of the first magnetic recording symbol (bar code) (the distance from the end of the magnetic recording medium to the first magnetic recording symbol) and the magnetic recording density (the number of bits). If you know enough, you can forge without any trouble. 2) Counterfeit Case 2 For user information, steal the PIN code of the card of the withdrawal operator from the operation of the person withdrawing cash with an automatic teller machine,
Moreover, it can be easily known from the bank code number and the deposit account number described in the balance statement discarded by the drawer (which is sent from the payment machine together with cash. It is often discarded). Therefore, the counterfeiter can carry out a forgery by putting a card owned by the forger on the magnetic recording device to erase his or her own user information and newly magnetically recording the user information of the other person who is known as described above. in this case,
When the counterfeiter's card is dipped in a developer, it appears as an image of a magnetic recording symbol (bar code). If you look at it, you can judge the recording conditions such as the position of the first magnetic recording symbol and the magnetic recording density (bit number). Since it is possible, magnetic recording can be performed in exactly the same way as another person's card. As described above, since the magnetic card can easily erase information and newly record information, an effective means for preventing forgery has not been established. In view of the above points, an object of the present invention is to provide an anti-counterfeiting method effective for appropriately preventing counterfeiting such as card forgery.

[0003]

A forgery prevention method according to the present invention uses a first information recorded in a first information recording area and a second information recorded in a second information recording area. A method for preventing forgery of a recording medium, comprising: third information, which is information obtained by continuously reading the first information and the second information, and the first information or the second information. There is the fourth information, which is the information obtained by continuously reading the first information and the second information when at least one of the information is rewritten, and the fourth information is obtained by the information reading device. The first information recorded in the one information recording area and the second information recorded in the second information recording area are continuously read, and the read first and second information are The first information and the second information as the third information And whether the information obtained by continuously reading the information with the information reading device is the third information or the fourth information, thereby preventing forgery. It is characterized in that In the method of the present invention, the first information recorded in the first information recording area and the second information recorded in the second information recording area are read by the information reading device without overlapping. In addition, the first information and the second information are different from each other.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. An example in which the method of the present invention is applied to the magnetic card field will be described as an example. In FIG. 1, reference numeral 1 denotes a magnetic card used for carrying out the method of the present invention. The magnetic card 1 records a low coercive force magnetic layer 2 as a second information recording area for recording second information and the first information. The multi-layer magnetic recording medium 4 including the high coercive force magnetic layer 3 as the first information recording area is formed on the card substrate 5.

The coercive force of the magnetic material differs between the low coercive force magnetic layer 2 and the high coercive force magnetic layer 3 by at least three times or more. That is, the coercive force of the high coercive force magnetic layer 3 has a value three times or more the coercive force of the low coercive force magnetic layer 2. The plan view of the magnetic card 1 is shown in FIG.
As shown in the figure, the recording medium 4 is formed in a stripe shape. Although FIG. 1 is shown as a vertical cross-sectional view taken along the line XX of FIG. 8, FIG. 1 is not shown as an accurate cross-sectional view, but is shown schematically for convenience of description. Therefore, hatching showing a cross section is also omitted. This situation is the same in FIGS. 2 and 3. The recording medium 4 is not limited to the stripe shape, the area of the recording medium 4 can be arbitrarily selected, and the longitudinal end of the recording medium 4 and the end of the card substrate 5 are not aligned. It may be one. The coercive force of the magnetic layers 2 and 3 can be arbitrarily selected, and various combinations of the two can be used. Generally, the coercive force of the magnetic layer standardized in the magnetic recording system is 300 Oe, 650 Oe, 1050 Oe, 30
There is 00Oe, and in the case of a cash card, it is currently 65
0 Oe is used. Therefore, also in the present invention, a magnetic layer 2 having a coercive force of 650 Oe can be used. In this case, the magnetic layer 3 is the coercive force material 650O of the magnetic layer 2.
Since it is necessary to have a coercive force that is three times as large as e or more, e.g., a coercive force of 3000 Oe can be used as the magnetic layer 3. An example in which the coercive force of the magnetic layer 2 is 650 Oe and the coercive force of the magnetic layer 3 is 3000 Oe will be described below.

Information is recorded on the magnetic card 1 having the magnetic recording medium 4 having the above-described structure as follows.
First, after the magnetic card 1 is manufactured, a magnetic card manufacturer applies the magnetic card 1 to a magnetic recording device to magnetically record the card-specific information a as the first information on the recording medium 4. In this case, the card-specific information recording area 6 as a first information recording area is provided in the recording medium 4 in advance, and the information a is recorded in the recording area 6. For example, in FIG. 8, an area on the right side of the dotted line 7 shown on the recording medium 4 is given as the card unique information area 6. In this embodiment, the magnetic layer for the purpose of recording the card-specific information a is not the low coercive force magnetic layer 2 but the high coercive force magnetic layer 3.
Generally, when magnetically recording on a magnetic layer, it is necessary to apply a magnetic field at least three times the coercive force of the magnetic layer. Therefore, in the case of this embodiment, it is necessary to apply a magnetic field of 9000 Oe to 10000 Oe in order to record the card specific information a on the magnetic layer 3. At this time, information a is also recorded on the magnetic layer 2 at the same time (FIG. 1B). Card-specific information a as the first information
Can be any card number, card symbol, etc., but must identify the card. Therefore, a certain card unique information a is given only to a certain card, and another card unique information is given to another card.

Next, the magnetic card manufacturer uses the magnetic recording device to erase the information a, which is the first information recorded on the magnetic layer 2. Generally, in order to erase the information recorded in the magnetic layer, it is necessary to apply a magnetic field at least three times the coercive force of the magnetic layer, as in the case of recording. Therefore, in the case of the present embodiment, 2000 is required to erase the information a from the magnetic layer 2.
It is necessary to apply a magnetic field of Oe. Now, assume that the information a is erased from the magnetic layer 2 by applying a magnetic field of 2000 Oe. Here, at least 90 is required to erase even the information a of the magnetic layer 3.
Since the magnetic field of 00 Oe is required, the information a of the magnetic layer 3 is not erased, but only the information a of the magnetic layer 2 is erased. In this case, if the coercive force of the magnetic layer 3 is less than three times the coercive force of the magnetic layer 2, the magnetic layer 3 is affected and there is a risk of demagnetization. In the present embodiment, the coercive force of the magnetic layer 3 has a value which is three times or more the coercive force of the magnetic layer 2 so that such a problem does not occur. Thus, the magnetic card 1 in which the card-specific information a as the first information is recorded only in the magnetic layer 3 is obtained (FIG. 1C).

Next, for example, a magnetic card issuer (for example, a bank, a credit company, etc.) places the magnetic card 1 on the magnetic recording device to magnetically record the user information b as the second information. In this case, recording is performed in the user information recording area 8 which is the second information recording area of the recording medium 4. In FIG. 8, an area on the left side of the dotted line 7 shown on the recording medium 4 is given as a user information recording area 8. At present, magnetic recording devices installed in banks, credit companies, etc. have a magnetic field of about 2000 Oe, so in the user information recording performed by the magnetic card issuer, the information b is recorded only on the magnetic layer 2 and the magnetic layer 2. Not recorded in 3. The user information b as the second information may be the same as the conventional one. For example, in the case of a cash card, the user information b includes a bank code number, a deposit account number, a personal identification number and the like.
Used as. Then, the card specific information a as the first information is recorded in the high coercive force magnetic layer 3 of the card specific information recording area 6, and the second coercive information a is recorded in the low coercive force magnetic layer 2 of the user information recording area 8. The magnetic card 1 on which the user information b is recorded is issued (FIG. 1D). The first information (card unique information) and the second information (user information) are continuously read and become the third information. Further, in the magnetic card shown in FIG. 1D, since the first information and the second information are recorded in the information recording areas 6 and 8, they can be read without overlapping when being read by the information reading device.

Next, the principle of anti-counterfeiting of the present invention will be described by taking as an example the case where the above magnetic card is a cash card. First, a case where a card forgery is performed using an unissued card in which only card-specific information is recorded will be described. In the unissued card, the user information as the second information is not recorded in the magnetic layer 2 as shown in FIG. 2A, but the card-specific information a as the first information is recorded in the magnetic layer 3. ing. Here, it is assumed that "1" is recorded as the card unique information a. It is assumed that this card is used to record the card unique information of another person and the user information b which the card counterfeiter can know in his / her duties.
Here, it is assumed that the card unique information a of another person is "2". In this case, since the magnetic recording device installed in the bank has a magnetic field of about 2000 Oe as described above, the card specific information a and the user information b are recorded only on the magnetic layer 2. In this case, the card unique information “2”
And "1" are superimposed on each other and recorded (Fig. 2B).

When the counterfeiter tries to withdraw cash by using the counterfeit card in an automatic teller machine installed in a bank, the magnetic reader reads the waveform of the card-specific information "1" and "2" as the first information. Since the waveforms are combined (the combined card-specific information and the user information b form the fourth information), noise is generated, and as a result, the device cannot read the card-specific information. , Cash is not withdrawn. That is, the information (fourth information) read by the reading device is the third information including the user information b which is the second information of the other person and the card unique information “2” which is the first information. The forgery is detected and prevented by making a difference in the unique information as the first information recorded in the first information recording area, and by discriminating it as the fourth information. If the card-specific information "2" is not recorded in the recording area 6, the combination of the card-specific information a and the user information b will be different, and the device will generate an inaccuracy signal, and cash will also be generated. Will not be withdrawn. Further, as will be described later, the card unique information "1" cannot be erased at the beginning.

Next, a case where the counterfeiter makes a forgery by using his own card will be described. As shown in FIG. 3A, the card unique information a and the user information b are recorded on the card owned by the counterfeiter. Here, the card unique information a
Is "3". The counterfeiter erases the information recorded on his card and tries to newly record information on another person's card. Here, as described above, since the normally usable magnetic recording device has a magnetic field of about 2000 Oe, the user information b recorded in the magnetic layer 2 can be erased, but the card-specific information " 3 "
Remain unerased (FIG. 3B). It is assumed that card unique information a and user information b'of another person's card which have been known by some means are recorded on this card. Here, it is assumed that the card unique information a of another person is “2” as described above. For the same reason as described above, the information a and b'are recorded only in the magnetic layer 2, and the card-specific information "2"
And "3" are overlaid and recorded (Fig. 3C). Even if this card is used, the magnetic reading device cannot read it for the same reason as described above, so crime is prevented.

Next, an example of a method of manufacturing a card applied to the present invention will be described. FIG. 4 shows a case of manufacturing by a transfer method, in which a peeling layer 10, a low coercive force magnetic layer 2, a high coercive force magnetic layer 3, and an adhesive layer (heat seal type) 11 are sequentially laminated on a support 9. The magnetic transfer tape made of the above is closely contacted with the card base material 5 via the adhesive layer 11 to heat and press to transfer the heat, and then the support 9 is peeled off (FIG. 4A) and further heated and pressed to be embedded in the card base material 5. Be flush with each other (Fig. 4
B). A 25 μm thick polyester film or the like can be used as the support 9, a 1-3 μm thick polyester resin or a butyral resin or the like can be used as the release layer 10, and a vinyl chloride resin or the like can be used as the card substrate 5. Adhesive layer 11
Usually has a thickness of 5 to 10 μm. The thickness of each of the magnetic layers 2 and 3 is usually 10 to 15 .mu.m, and those having a residual magnetic flux of 1.4 maxwell / cm are usually used.

In order to prevent mutual interaction between the magnetic layers 2 and 3 (for example, when the magnetic layers 2 and 3 are laminated, the surface of the lower layer is dissolved by a solvent to form surface irregularities).
As shown in, a barrier layer 12 having a thickness of 10 μm or less may be interposed between the magnetic layers 2 and 3. As the barrier layer 12, a synthetic resin film, aluminum foil or the like can be used.

FIG. 6 shows a case of manufacturing by the coating method, in which the magnetic layer 3, the magnetic layer 2,
For example, a protective layer 13 made of a synthetic resin film is sequentially coated, heated and pressed, and embedded in the card base material 5 to be flush with each other.

FIG. 7 shows a case where the magnetic layer 3 and the magnetic layer 2 are formed on the base film 14 by the laminating method.
The protective layer 13 is laminated in order, and the base film 14 is attached to the card substrate 5 via the adhesive layer 15 so that the base film 14 is on the card substrate 5 side. Embedding is flush with each other. In the structures shown in FIGS. 6 and 7, the barrier layer 12 can be provided between the magnetic layers 2 and 3. 4B to 7 are vertical sectional views taken along the line YY of FIG.

Next, specific examples of the present invention will be shown. EXAMPLE A magnetic recording device was used to magnetically record predetermined card specific information (first information) in a card specific information recording area of a multilayer magnetic recording medium of a magnetic card with a magnetic field of 10,000 Oe, and then a low coercive force was applied by a magnetic field of 2000 Oe. The card-specific information on the magnetic layer was erased. Then, predetermined user information (second information) was recorded in the user information recording area by a magnetic field of 2000 Oe. The card unique information and the user information are continuously read and become the third information. Next, the user information was erased by a magnetic field of 2000 Oe, and another user information and card unique information different from the user information and the card unique information were recorded by the magnetic field of 2000 Oe. Then, when this magnetic card was applied to a magnetic recording / reading device, noise was observed and it was impossible to read.

[0018]

As described above, according to the method of the present invention, the information obtained by continuously reading the first information and the second information recorded in different information recording areas from each other is referred to as "third information". The information obtained by being continuously read in a state in which at least one of the first information or the second information is rewritten is referred to as “fourth information”, and the first information is read by the information reading device. Both the first information recorded in the information recording area and the second information recorded in the second information recording area are checked, and thus the first and second information read by the device. By making the information consisting of the third information correspond to the first information and the second information, it is possible to discriminate whether the information is the third information or the fourth information. It can be prevented. Such a method of the present invention can be effective forgery prevention means when applied to various fields, not limited to the field of magnetic cards such as cash cards and credit cards.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a process of recording each information on a magnetic card used for implementing the present invention.

FIG. 2 is an explanatory diagram showing a process of card forgery.

FIG. 3 is an explanatory diagram showing another example of a card forgery process.

FIG. 4 is a vertical cross-sectional view showing a configuration example of a magnetic card used for implementing the present invention.

FIG. 5 is a vertical cross-sectional view showing another configuration example of the magnetic card.

FIG. 6 is a vertical cross-sectional view showing another configuration example of the magnetic card.

FIG. 7 is a vertical cross-sectional view showing another configuration example of the magnetic card.

FIG. 8 is a plan view of a magnetic card used for implementing the present invention.

[Explanation of symbols]

 4 Recording Medium 6 First Information Recording Area (Card Unique Information Recording Area) 8 Second Information Recording Area (User Information Recording Area) a First Information (Card Unique Information) b Second Information (User Information)

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Claims (3)

[Claims] 1. A method for preventing forgery of a recording medium having first information recorded in a first information recording area and second information recorded in a second information recording area, the method comprising: Third information, which is information obtained by continuously reading the first information and the second information, and information in which at least one of the first information or the second information is rewritten. There is a fourth information which is information obtained by continuously reading the first information and the second information in a certain case, and the first information recorded in the first information recording area by the information reading device. And the second information recorded in the second information recording area are continuously read, and the read first and second information are the first information as the third information. Check if there is a correspondence with the second information above. An anti-counterfeiting method, comprising: determining whether the information continuously read by an information reading device is the third information or the fourth information to prevent forgery. 2. The first information recorded in the first information recording area and the second information recorded in the second information recording area can be read by the information reading device without overlapping. The forgery prevention method according to claim 1. 3. The first information recorded in the first information recording area and the second information recorded in the second information recording area are different from each other. Counterfeit prevention method.