JP2743917B1 - Card type recording medium and its validity verification method - Google Patents

Abstract

A magnetic card that is difficult to forge and illegally use is provided. Kind Code: A1 The same information as magnetic data is previously recorded on a magnetic card by a Fourier transform (FF) of a fingerprint pattern of the user.
T) The frequency spectrum pattern is superimposed on the frequency spectrum pattern, and the pattern is inversely FFT-transformed and printed on a magnetic card.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic card such as a credit card and a cash card, and more particularly to a technique for verifying the validity of the card.

[0002]

2. Description of the Related Art Conventionally, as a technique for verifying a legitimate owner of a magnetic card such as a credit card or a cash card, for example, as shown in Japanese Patent Application Laid-Open No. 64-76270, a magnetically encrypted The ID of the owner is stored, the ID is decrypted from the card, and the ID is separately input by the owner.
By verifying that the card is a legitimate owner of the card (hereinafter referred to as “first conventional technology”).

[0003] Japanese Patent Application Laid-Open No. 06-135187 discloses that
A magnetic card is disclosed in which a photograph of the face of the owner is printed on the card in addition to the magnetic data originally stored on the card, and data obtained by encrypting the photographic information is also printed. In the technology described in this publication, the encrypted photo information is decrypted,
The identity of the face photograph with the image information is collated, and the validity of the card is mechanically determined (hereinafter, “second related art”).

[0004]

In the first prior art,
Since the information of the card is recorded only with the magnetic information, the same card can be created if the third party easily copies the magnetic information as it is.

[0005] Further, even in the second prior art in which a card has a photograph or the like, the same card can be made by directly copying. Further, since data correlated with the face photograph is printed, the contents can be easily analyzed based on the photograph data of the card. Further, according to the prior art 2, when a photograph portion or an encrypted photograph information portion of a card is greatly damaged, there is a possibility that a genuine card is mistaken for a forged card.

According to the present invention, the information to be put on the magnetic card is provided in both the magnetic data and the pattern of the card, and the third
It is an object of the present invention to prevent a person from duplicating a card and to easily determine if the card is duplicated, thereby improving security.

[0007]

SUMMARY OF THE INVENTION A magnetic card decryption system according to the present invention is provided with a magnetic data decrypting method so that when a third party illegally duplicates the magnetism of a card, it is possible to easily determine whether the card is a duplicated card. In addition to the above, by providing a means for inserting information into the pattern of the card, a means for easily judging whether or not an illegal copy is provided is provided.

More specifically, the original card pattern is subjected to FFT (Fast Fourier Transform) processing on the owner's fingerprint pattern, which is the basis of the card pattern, to convert it into frequency domain information. The ID information is added to a frequency component having a high energy with the information in the frequency domain,
The result of the addition is converted from the frequency domain into a two-dimensional image by inverse FFT processing, and a pattern of a fingerprint pattern in which ID information is embedded in the card is printed.

The fingerprint pattern of the card is read by a reader, the image is converted into frequency domain information by FFT processing, the fingerprint of the owner is read by the reader, and the data is subjected to FFT processing to obtain the information in the frequency domain. Then, a difference from the converted ID is obtained, and ID information is extracted.

The data read by the card magnetic reader as before is decrypted and decoded to extract ID information. The ID information and the ID information extracted from the card pattern are compared, and if the ID is the same, it is determined that the card is an original card, and if the ID is different, the card is an illegally copied card.

[0011] In the magnetic card of the present invention, in addition to ordinary magnetic information, ID information is also inserted into the pattern of the card. For this reason, even if only the magnetic data is copied, it is not regarded as the same card unless the pattern portion is copied. By comparing the ID information extracted from the pattern of the card with the ID information extracted from the magnetic data, it is possible to easily identify an illegal copy of the card. Also, if the pattern contains ID information, the ID information will be imprinted on the place where the energy of the frequency component of the pattern is strong, so that it is impossible for an amateur to distinguish it. Even if the difference between the patterns is found, it is impossible to extract the ID information unless the fingerprint pattern of the person exists.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a fingerprint pattern of a card is read by a card image reader 6, and the image is read by an FF.
Fast Fourier transform is performed at T7. Read your fingerprint pattern with fingerprint pattern reader 10 and read the data
Fast Fourier transform is performed by FT11. The subtracter 8 calculates the FFT
The ID information 9 is extracted by subtracting the FFT 11 output from the 7 outputs.

Further, the magnetic data of the card is read by the card magnetic reader 1, the code is decoded by the decoding process 2 and the ID information 3 is extracted.

The comparator 4 compares the ID information 9 extracted from the pattern of the card with the ID information 3 extracted from the magnetic data. to decide.

Next, a method for producing the card 6 will be described. In this card, ID information is embedded in the fingerprint pattern of the card in advance. A method of embedding ID information will be described in detail with reference to FIG.

A personal fingerprint pattern 12 to be printed on a card
Is converted to the frequency domain by the FFT 11 and the ID information 9
Is added to the band where the frequency component is strong by the adder 13. In this case, since the minute ID information is added to the place of the strong energy, the original image is hardly affected.

Next, the result is converted into a two-dimensional image image by the inverse FFT 14 to create a pattern to be printed on the card, and the fingerprint pattern printer 15 prints a fingerprint pattern on the card as shown in FIG. . Here, the printed fingerprint pattern is an image that cannot be visually distinguished from its own fingerprint pattern 12, and this pattern looks the same even if the ID information is different.

The ID information 9 is encrypted by the encryption 16 and the magnetic tape maker 17 creates magnetic information on the magnetic stripe (18 in FIG. 3) of the card.

By the above-described method, a card in which the ID information of the card is imprinted on both the magnetic data and the pattern of the fingerprint pattern of the card can be obtained.

Returning to FIG. 1, the card created by the above-mentioned method is first read by the fingerprint pattern reader 6 with the pattern of the card, and the read image is converted into frequency domain information by the FFT 7. Then, a frequency spectrum of the fingerprint pattern + ID information is generated, and this spectrum is shown as 20 in FIG. Next, the owner's fingerprint pattern 1 read by the fingerprint reader 10 of FIG.
2 is converted into the frequency domain by the FFT 11, the fingerprint data frequency spectrum 2 as shown in FIG.
2 is obtained. When the subtractor 8 subtracts the fingerprint data frequency spectrum 22 from the fingerprint pattern + ID information frequency spectrum 20, only the ID information portion is extracted as shown in the ID information frequency spectrum 21.

The magnetic data is read by the magnetic reader 1 of the card, and the information is decoded in a decoding process 2 to extract the ID information 3.

Next, ID information 9 extracted from the pattern of the fingerprint pattern of the card and I information extracted from the magnetic data of the card
The D information 3 is compared by the comparator 4, and in the determination circuit 5, if the same ID information, the card is determined to be a legitimate card, and if the ID information is different, the card is determined to be an illegally copied card. .

The above processing can be realized by a computer or the like storing a program. That is, the program for executing the above processing can be stored in a storage medium such as a floppy disk, and can be executed by a computer loaded with the program from the storage medium.

[0025]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, the fingerprint image of the card is read by the card image reader 6. FFT7 and FF
T11 is a fast Fourier transform that divides into 25 frequency bands, and the number of quantizations for each frequency band is 16 bits. The fingerprint pattern read from the card by the FFT 7 is subjected to the fast Fourier transform, and the fingerprint pattern read by the fingerprint reader 10 is subjected to the fast Fourier transform by the FFT 11, and the subtractor 8 subtracts the result.
The bit ID information 9 is extracted.

The magnetic data of the card is read by a card magnetic reader 1, and the data is decoded by decoding 2 to extract 32-bit ID information 3.

The comparator 4 compares the 32-bit ID information 9 extracted from the pattern of the fingerprint pattern of these cards with the 32-bit ID information 3 extracted from the magnetic data, and outputs 0 when they are the same, If it is different, it outputs 1 and the determination circuit 5 determines that it is a valid card when it is 0 and that it is an illegally copied card when it is 1.

First, a 32-bit I is added to the card pattern in advance.
Embed the D information. A method of embedding ID information will be described in detail with reference to FIG. The fingerprint pattern 12 to be printed on the card is converted into the frequency domain by the FFT 11 and the 32-bit ID information 9 is added by the adder 12 to the band where the frequency component is strong. The FFT 11 is a Fast Fourier Transform that divides into 25 frequency bands, and the number of quantizations for each frequency band is 16 bits. In this case, since the minute ID information is added to the place of strong energy, it has almost no effect on the fingerprint pattern of the user. The addition method at this time is to divide the 32-bit ID information into 4 bits × 3 bits, 3 bits × 4 bits, and 2 bits × 4 bits and add them in order from the place where the energy of the frequency component of the original image is strong. To go. Next, the result is inverse FFT14
Is converted into a two-dimensional image, a pattern to be printed on a card is created, and a fingerprint pattern printer 15 prints a fingerprint pattern on the card. Here, the printed image is an image that cannot be visually distinguished from the fingerprint pattern 12, and all the patterns look the same even if the ID information is different.

Further, the 32-bit ID information 9 is encrypted by encryption 16 and the magnetic tape maker 17 creates magnetic information on the card.

In the above method, the 32-bit ID information is
A card is imprinted on both the magnetic data and the fingerprint pattern of the card.

First, the card created by the above-described method is
When the pattern of the card is read by the fingerprint pattern reader 6 and the image is converted into frequency domain information by the FFT 7, the result is shown as a fingerprint pattern + ID information frequency spectrum 20. Next, the user's own fingerprint pattern 12 is
When converted to the frequency domain by 1, the data becomes as shown in the fingerprint data frequency spectrum 22, and the subtractor 8 converts the frequency spectrum 20 of the fingerprint pattern + ID information into
When the fingerprint data frequency spectrum 22 is subtracted, FIG.
As shown in the figure, the ID information 21
As shown in (1), only the part of the ID information is extracted. The spectrum of only the ID information is rearranged in the reverse order of the order in which the spectrum was previously written on the card, and returned to the 32-bit ID information.

Further, the magnetic data is read by the magnetic reader 1 of the card, and the information is decoded in a decoding process 2 to extract 32-bit ID information 3.

Next, the comparator 4 compares the 32-bit ID information 9 extracted from the pattern of the fingerprint pattern of the card with the 32-bit ID information 3 extracted from the magnetic data of the card. 0 is output, and if different, 1 is output. In the determination circuit 5, when the value is 0, the card is a legitimate card, so that the process proceeds to the normal card processing. When the value is 1, the card processing is stopped because the card is illegally copied. .

Next, a second embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 6, the principle is basically the same as that of FIG. 1, and a DCT (discrete cosine transform) used in image compression such as JPEG is used for a portion corresponding to the FFT in FIG. At this time, in the first embodiment, the frequency domain conversion is performed for all information of the fingerprint pattern. However, in the second embodiment, when the pattern of the card is created,
The user's own fingerprint pattern is divided into fine images (blocks) of 8 × 8 dots in advance, and the fingerprint is imprinted using DCT. In this case, the ID information 9 indicates that the fingerprint pattern is 8 × 8.
Because ID information is imprinted on all the areas that are finely divided into dots, even if the card is scratched or your fingerprint has some scratches, even if there is a slight scratch on your fingerprint, due to the correlation of the data on the undamaged part, For example, the majority decision process has a new feature that ID information can be extracted if there is a certain degree of damage.

[0037]

The first effect is that the information and ID of the magnetic card are
This means that ID information can be collated with image information on which information is imprinted. This makes it easier to judge whether a card has been illegally copied or an original card. The reason is that the ID information is printed on the pattern of the magnetic card so that it is not recognized that the ID information is included in addition to the magnetic portion of the magnetic card.

The second effect is that the ID information can be easily confirmed even if the data in the magnetic portion of the magnetic card is broken. Thus, even if the magnetic data is destroyed by the influence of the external magnetism, the ID information is imprinted on the pattern, so that the information can be read to determine whether the card is an original card.
The reason is that the pattern portion is not affected by magnetism and the ID information is not broken.

[Brief description of the drawings]

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a flowchart for creating a card according to the embodiment of the present invention.

FIG. 3 is a card diagram of an embodiment of the present invention.

FIG. 4 is a diagram illustrating the principle of the present invention.

FIG. 5 is an ID information extraction diagram according to the embodiment of the present invention.

FIG. 6 is a block diagram of one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Card magnetic reading 2 Decoding 3 ID information 4 Comparator 5 Judgment circuit 6 Card image pattern reader 7 FFT (Fast Fourier transform) 8 Subtractor 9 ID information 10 Fingerprint reading 11 FFT 12 Personal fingerprint pattern 13 Adder 14 Reverse FFT 15 Fingerprint pattern printer 16 Encryption 17 Magnetic tape maker 18 Card magnetic information 19 Card fingerprint pattern 20 Fingerprint data + ID information frequency spectrum 21 ID information frequency spectrum 22 Fingerprint data frequency spectrum 23 DCT (discrete cosine transform) ) 24 DCT

Claims (9)

(57) [Claims] 1. A card-type recording medium including a data area in which data including ID information of an owner is recorded and an image area in which image data is recorded. One image data is converted to frequency domain data, the ID information is added to the converted frequency domain data, and the added data is inversely converted to an image signal. 2. A card-type recording medium on which image data of item 2 is recorded. 2. The card-type recording medium according to claim 1, wherein the ID information of the data area is encrypted and recorded. 3. The card-type recording medium according to claim 2, wherein the first image data is a fingerprint image of an owner. 4. The card-type recording medium according to claim 3, wherein the conversion process to the data in the frequency domain is a Fourier transform. 5. The frequency domain data conversion process is a discrete cosine transform performed on each of blocks obtained by dividing the first image data into a plurality of blocks. Item 4. A card-type recording medium according to Item 3. 6. A card-type recording medium including an area in which data including ID information of an owner is recorded and an image area in which image data is recorded, wherein the image area includes a second information specifying the owner himself. One image data is converted to frequency domain data, the ID information is added to the converted frequency domain data, and the added data is inversely converted to an image signal. A first step of restoring the ID information from the card-type recording medium and reading data in the image area, the method comprising: A second step of performing a conversion process on the data in the area to data in the frequency domain to generate first converted image data; and transmitting the same image data as the first image data to the storage medium. A third step of obtaining the second converted image data by converting the obtained image data from the outside and converting the obtained image data into the data of the frequency domain, and a second converted image from the first converted image data A fourth step of comparing difference data obtained by subtracting the data with ID information restored from the card-type recording medium and judging the validity of the storage medium. A method for verifying the validity of a recording medium. 7. The method according to claim 6, wherein the conversion process to the data in the frequency domain is a Fourier transform. 8. The method according to claim 1, wherein the conversion processing into the data in the frequency domain is a discrete cosine conversion performed on each of blocks obtained by dividing the first image data into a plurality. Item 7. A method for verifying the validity of a card-type recording medium according to Item 6. 9. The step of comparing the difference data obtained for each block with ID information restored from the card-type recording medium, and performing the determination based on a majority decision of the comparison result. 9. The method according to claim 8, wherein the validity of the card-type recording medium is verified.