JPS60153580A - Method for deciding legality of card - Google Patents

Abstract

PURPOSE:To obtain a card legality deciding method comparatively prevented from disturbance by encoding and decoding writable data in the 2nd recording part on the basis of the data in the 1st recording part inherently included in a card. CONSTITUTION:To write data in the card C, the card C is inserted into a card device, the data in the 1st recording part 3 of the card C are read out by a recording data reading head 5 and the value of a medium variable (m) is stored in an encoding part 10 of a function operating part AU1 through the 1st reading data processing part 8. When the data (x) to be recorded are inputted to the encoding part 10 of the function arithmetic part AU1, conversion is executed by a previously fixed function f(x, m). Recording data converted by the encoding part 10 are written in the 2nd recording part 2 of the card C by a writing head 6 through a writing data processing part 11. To decide the legality of the data read out from the card C, the data in the 1st and 2nd recording parts 2, 3, the medium variable (m) is extracted and the data (y) are converted as reversed function f<-1>(y, m).

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a technology for proving the validity of a card itself, which requires high confidentiality, such as when used for payment.

(Prior Art) Conventional methods for proving validity have been to use a special recording method on the card, or to attach a special mark to the card, and to check for the presence or absence of the mark. However, in many cases, these are expensive, and once the recording method is determined, there is a risk that they will be vulnerable to forgery and the like.

An easy idea to prevent this is to encrypt the card device, but with encryption using the same key data, there is a high risk that the key data will be revealed by verifying multiple cards, so the card cannot be used as a special However, if a legitimate card was obtained in some way, it had the disadvantage that it could easily be made to perform the same functions as other cards by tampering with the data.

(Object of the invention) The present invention solves the conventional drawbacks as described above.
The object of the present invention is to provide a card validity determination method that allows a card usage system that is relatively resistant to interference to be constructed with a simple configuration.

(Structure of the Invention) For the above purpose, the present invention provides a card with a first recording section that is not rewritable and in which recording is performed at least at the time of issuance or manufacturing, and a second recording section that is capable of reading and writing. is a functional operation for decoding the data read from the second recording section of the card using the data read from the first recording section of the card as a parameter, and encoding the data written to the second recording section. To determine the validity of the card, predetermined common data is set in part of the data of the second recording part of the card, and when the data of the second recording part of the card is read, The card is recognized as a legitimate card by the existence of the genuine data in part of the recording unit data of the card.

(Example) An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a first embodiment of a card used in the card validity determination system of the present invention, in which (a) is a plan view and (b) is a side view. As shown in the figure, the card C has a first recording section (medium) 3 on the card board 1 that cannot be rewritten and a second recording section (medium) 2 that can read and write. at least at the time of publication or at the time of manufacture
is being recorded.

FIG. 2 is a block diagram of a card device showing a first embodiment of the card validity determination method of the present invention. In the figure, 4 is the second
5 is a recording data reading head of the first recording section 3; 6 is a data writing head for the second recording section 2; 7 is a recording data of the second recording section 2. A second read data processing unit that shapes, aligns, and dinotals the output of the reading head 4; and 8 a first read data processor that shapes, aligns, and dinotals the output of the first recording head 5; 9 is an encoding unit of a function operation unit AUI that decodes the output from the first read data processing unit 8 as a parameter, and 10 is a function that encodes the output from the first read data processing unit 8 as a parameter. Encoding unit of calculation unit AUI, 1
1 is a write data processing unit that aligns and shapes write data to the second recording unit 2 to the write head 6 according to a driving waveform;
2 is a common data generation unit that generates predetermined common data a;
13 is a card validity determining unit which compares the recorded data in the common data recording unit of the reading citator with the common data from the common data generating unit 12 and outputs an OK signal to the double signal determination output terminal 14 if they match; 15 is a write data input Terminal 16 is a read data output terminal.

As shown in the figure, in order to write data to this card C, first insert the card C into the card device, read the data in the first recording section 3 of the card C using the recorded data reading head 5, and then read the data in the first recording section 3 of the card C. The value of the parameter m is stored in the encoding unit 10 of , via the first read data processing unit 8. Next, the data X to be recorded, including the common data a that is not used for validity verification, is transferred to the input terminal 15 and transferred to the function calculation unit AI.
When input to the encoding unit 10 of Jl, the encoding unit 10 converts it using a predetermined function f(x, m). It goes without saying that the function calculation unit AU1 does not need to perform data processing unit verification log processing as long as it can realize a function calculation that has a unique solution using the inverse function f-'(y, m). The recording data y=f(x, m) that has been converted into f(x, m) by the encoding unit 10 is subjected to array conversion and waveform shaping by the write data processing unit 1, and is then sent to the write head 6. is written to the second recording section 2 of the card C.

Next, in order to read data from this card C and determine its validity, the data y recorded in the second recording section 2 and the recorded data M of the first recording section 3 are transferred to the second recording section. The reading head 4 and the second read data processing section 7 and the first recording section are read by the reading head 5 and the first read data processing section 8, and the first recording section is read by the first read data processing section 8. Extract the parameter m from the data M and use the function calculation unit AUI
The decoding unit 9 transforms the data y in the second recording unit 2 using an inverse function f-'(y, m). Therefore, if the card is valid, the common data a is incorporated in the inversely converted data f-'(y, m). The validity of this card can be determined by comparing it with the output a from . This is output to the validity determination output terminal 14. Further, the recording data is outputted to the output terminal 16. It should be noted that it is not necessary to use all the records in the first recording section 3 with the parameter m of the function operation section AU on the card, and it is not necessary to use them in the same recording order. Naturally, as described above, according to the present invention, since the validity of a card can be determined only by the card and the card device, there is an advantage that a card usage system that is relatively less susceptible to interference can be constructed with a simple configuration.

FIG. 3 shows an example of a card used in the second embodiment of the present invention, in which (A) is a plan view, (←) is a right side view, and (C) is a left side view. Note that the same functional parts as in FIG. 1 are given the same reference numerals. As shown in the figure, card-specific data n
This is a case where the data is recorded on a part 2' of the second recording section 2 of the card C'. For convenience of explanation, the recording part of the unique data n is shown all at once in the figure, but this is the second recording part 2.
It goes without saying that there is no problem even if they are dispersed in a certain arrangement.

FIG. 4 is a block diagram of a card device showing a second embodiment of the present invention. Note that the same functional parts as in FIG. 2 are given the same reference numerals. In the figure, 17 is the first function operation unit A
A unique data extraction processing unit 18 extracts data unique to the card C' from the output data of the decoding unit 9 of U1 and arranges and outputs the remaining data; The decoding section 19 of the second function operation section AU2 decodes the input data using data as a parameter, and the decoding section 19 decodes the input data using data unique to the card C' from the data processing section 17 as a parameter. The encoding unit 20 of the second function operation unit AU2 adds data unique to the card C′ from the data processing unit 17 to the output of the encoder 19 of the second function operation unit AU2, arranges the data, and arranges the data unique to the card C′. This is a unique data insertion processing unit for inputting to the encoding unit 10 of the function operation unit AU.

As shown in the figure, in order to write data to the card C', first insert the card C' into the card device shown in FIG. is read, and encoder 1 of the first function operation unit AUI
0 through the first read data processing section 8. Then, when the data X to be recorded including the common data a used for validity verification is inputted from the input terminal 15 to the encoding unit 19 of the second function operation unit AU2, the second It is converted by a function g(x, n) using data n specific to the card C' extracted from the read data of the recording unit 2 as a parameter. For the function g(x, n), the first function operation unit AU,
As with the function f(x9m), any function can be used as long as the uniqueness of the solution is established. Note that when writing to the card for the first time, n must be given not by the data from the unique data extraction processing section 17 but by another unique data setting means (not shown). The data z, which has been transformed by the function g (X r n ), is processed by the unique data insertion processing unit 20
(However, in the figure, (z ten n
), (10n) are convenient expressions indicating that n is added. ), first function operation unit AU, encoding unit 1
It is input to 0.

The first encoding unit 10 further applies a function transformation f((z+n), m) to the input data using a parameter m, and then outputs it to the write data processing unit 11. The write data processing section 11 performs alignment, waveform shaping, etc. on the write data, outputs the data to the write head 6, and writes it into the second recording section 2 of the card C'.

Next, in order to read the data from the card C' and determine its validity, the data recorded in the second recording section 2)'-f
((Z+n), m) and the recorded data M of the first recording section 3 are transferred to the second recording section reading head 4, the second read data processing section 7, and the first recording section reading head 5 and the first recording section, respectively. The read data processing unit 8 reads 9, the first read data processing unit 8 extracts the parameter m from the data M of the first recording unit 3, and the decoding unit 9 of the first function calculation unit AU1 extracts the parameter m from the data M of the first recording unit 3. The data y in the second recording section 2 is transformed by an inverse function f'(
y, m). If the card is legal, the result is z+n=
g(x, n)+n (However, +n is a convenient expression to indicate that it is added to g(x, n).)
It should be. Next, from the data that has undergone the first decoding, n is extracted and removed by the unique data extraction unit 17 ((-n) in the figure is also an expression for convenience), and the second function calculation unit AU2 The data is input to the decoding unit 18 of.

The second decoding unit 18 performs inverse function transformation g −′ (Z +
n) and sends the result to the validity determining unit 13. The validity determining unit 13 checks whether the common data a sent from the common data generating unit 12 is incorporated in a predetermined position of the data sent from the second decoding unit J8, and determines whether the common data a is incorporated. If so, an output indicating that the card is valid is output to the validity determination result output terminal 14.

In this way, by incorporating card-specific data into the recorded data A- of the second recording section 2 and performing the second encoding using this data as a parameter, it is possible to perform a more rigorous and sophisticated verification of the card's validity. Become something. Further, if the first encoding and the second encoding are separated, there is an advantage that interference becomes more difficult. Note that the recording method of the card used in the present invention may be magnetic recording, semiconductor recording, optical recording, or the like.

In particular, the recording in the first recording section 3 of the card only needs to be readable, so it may be something like a printed barcode. However, a recording method for the first recording section 3 that can further enhance the effects of the present invention will be described next.

FIG. 5 is a diagram for explaining the reading mechanism in the case where the first recording part 3 of the card is a thin film part with different film thicknesses, and the brightness and darkness due to interference of reflected light is read as a recorded code. As shown in the figure, when light is emitted from the light emitting section 23, a portion is reflected at point B, and a portion is reflected at the interface C between the thin film 2 and the substrate 22, and reaches the light receiving section 24. This ABF and A
The optical path difference of BCDF is given by L""2d54-.

(See Kyoritsu Physics Course 11. Optical Physics (written by Takashi Kushida), page 50). However, nl is the refractive index of light in air, d is the film thickness,
θ1 is the incident angle, and n2 is the refractive index of the thin film O. Here, if the film thickness d is constant and the positional relationship between the light emitting part 23, the light receiving part 24, and the card surface does not change, the reflected light input to the light receiving part 24 is n ,〈n2〈n3 or nl > n2 >
When n3, it is always bright when L=pλ (where p is an integer), and when n2< nl + n3, L=(p
+1) λ results in bright constant light. However, n3 is the refractive index of the substrate 22. Here, if the film thickness d according to the present invention is changed with respect to the recording direction of the card, the light reflected to the light receiving section 24 will vary in brightness and darkness according to the change in the film thickness d. can be treated as recorded data.

Note that if the film thickness is changed stepwise to satisfy L = pλ, L = (p + 2) Even if the number does not reach 24, it may be regarded as part of the recording data, and therefore, there is no particular need for the step-like shape. It is extremely easy to create such a thin film by applying recent laser recording and processing techniques, and it is also extremely easy to make random numbers recorded in the first recording section, which is necessary in the present invention.

By configuring the first recording section 3 of the card in this manner, the incident angle θ1 can be set to a value unique to the card device, which has the advantage of making it less susceptible to interference by others. Although no particular measures are taken at the interface between the first recording section 2 and the substrate 22 in FIG. 5, it is easily possible to insert a highly reflective substance into the interface. . Furthermore, it is easy to attach a light-transmitting protective film to the card. Furthermore, if the film thickness is also changed in a direction perpendicular to the recording reading direction, it becomes even more difficult to read without knowing detailed design data such as the reading position.

Furthermore, it is easily possible to widen the width of the recording section or to use a plurality of recording sections to record a plurality of parallel data.

Next, FIG. 6 is a diagram for explaining the reading method of the first recording section 3, which has a structure in which a medium having a different light transmittance depending on the wavelength of light is dispersed in a transparent polymer medium. (a) is a diagram for explaining the configuration of the recording section when the first recording section is a polymeric medium in which media with different vectors are dispersed in a transparent film, and (b) is a diagram showing G in (,). -Explanatory diagram when reading records along line G', (C) is H- in (,) figure
FIG. 3 is a cross-sectional view of the first recording section taken along line H'.

In FIG. 6(,), a transparent polymer medium 26, which is the main constituent material of the first recording section, is sandwiched between a transparent support film (not shown) that also serves as a protective film on the card 25, or other appropriate means. The card 25 is held at a fixed position by the card 25. Mediums 27 to 30 having different light transmitting spectral distribution characteristics are dispersed in a transparent plastic polymer medium 26 (which may have light transmitting spectral distribution characteristics). Here, for explanation, medium 2
It is assumed that the transmission spectrum distribution of 7 to 30 is as shown in FIG.
It is assumed that the numbers correspond to numbers 7 to 30. Figure 6 (b
), the light from the light emitter 32 passes through the transparent space formed in the member 31, which is a guide for the light and the card, and passes through the medium 26 that is located in the first recording section of the card, and then passes through the transparent medium 26 in the first recording section of the card. It passes through the gap and reaches the light receiver 33.

Now, when the light emitter 32 emits white light, light having a spectral distribution as shown in FIG. 8 is input to the light receiver 33 as the card moves. Note that the shaded area is the area that does not allow light to pass through.

Although this may be detected as is, in order to simplify the reading, the emission spectrum of the light emitter 32 as shown in 1 in FIG. J
, , and L, and light transmission and light blocking by the light medium may be measured. In addition, the light emitter 32. A plurality of sets of light receivers 33 are prepared, and their spectra are 1. It is also conceivable to use J, ni, or L. For example, if the second reading position is placed at the line HH' in FIG. 6(a), the cross section of the first recording section 26 through which the light passes is shown in FIG. 6(C).
Shown below.

Now, the data structure of the first recording section is shown in Figure 9, assuming that the detected spectrum at the position G-G' in Figure 6 (,) is ■, and the detected spectrum at the position H-H' is J. show. 9th
In the figure, the case where the light receiver 33 detects light is shown as 1.

By configuring the first recording section of the card in this way, the system provider can select the reading position, the spectrum of the reading light, etc. as appropriate, making the parameter variables used in the method of the present invention private. It has the advantage of being possible. In this case, the random number recording data can be created very easily by, for example, making a tape in which media with different spectral distributions are appropriately dispersed in a polymeric medium, cutting the tape as appropriate, and incorporating it into a card.

(Effects of the Invention) As described above in detail, according to the present invention, since the card can encode the original recorded data using the data in its own first recording section, it is possible to encode other valid data recorded with the same type of data. Even if compared to other cards, it would take a great deal of effort to uncover the recorded contents, it would be practically impossible to unravel it, and it would be less susceptible to interference by forgery or the like. Furthermore, if data unique to the card, such as a serial number, is added to the recorded data in the second recording section of the card, and the recorded data is encoded using this as a parameter, the effect is that it is less susceptible to interference. In addition, when using a regular card, the card device is relatively simple, and the validity of the card can be determined based only on the data written on the card, increasing the added value of the card and allowing it to be used in a wide range of applications. Moreover, by specially configuring the first recording section, the degree of freedom in designing the high-secrecy chamber in stem construction is further increased, making it less susceptible to interference such as forgery, etc., and the effects are further increased. .

[Brief explanation of the drawing]

FIG. 1 shows a first embodiment of a card used in the judgment method of the present invention, (a) is a plan view, (b) is a side view, and the second view shows the first embodiment of the same judgment method. 3 shows a second embodiment of the card, in which (a) is a plan view, (b) is a right side view, (c) is a left side view, and (c) is a left side view. The figure also shows a configuration diagram of a card device showing a second embodiment of the determination method, and FIG. Figure 6 (,), which is a diagram to explain the reading principle of the configuration, explains the configuration of the recording section when the first recording section of the card is a polymeric medium in which media with different light transmission spectra are dispersed. Fig. 6(b) is an explanatory diagram for reading records along line GG' in Fig. 6(a), and Fig. 6(c) is an explanatory diagram for reading records along line GG' in Fig. 6(a). A cross-sectional view of the first recording section along line H', FIG. 7 is a diagram for explaining the light transmission spectrum distribution characteristics of the medium in FIG. 6, and FIG. 8 is a diagram for explaining the transmission spectrum distribution characteristics of the medium in FIG. Figure 9 is a diagram for explaining the receiving side spectral distribution when using . FIG. 7 is a diagram showing the output of the light receiving section when line reading is performed using light of wavelength J. 1...Card board, 2...Second recording section (medium), 2'
... Unique data recording section of the second recording section, 3...
First recording unit (medium), c, c'... card, 4
, 5... to read, l-', 6... to write, de,
7... Second read data processing unit, 8... First read data processing unit, 9... Decoding unit, 10... Encoding unit, 1... Write data processing unit, 12... Common data generation unit, 13... Validity determination unit, 14... Validity determination output terminal, 15... Write data input terminal, 16... Read data output terminal, 17... Unique data extraction processing section, 18... decoding section, 19... encoding section, 20...
- Unique data insertion processing unit, 21...thin film, 22...
Card board, 23... Light emitting section, 24 Light receiving section, 25.
...Card, 26...First recording unit medium, 27-30
...first recording medium, 31, 31'...guide portion, 32...light emitter, 33...light receiver, AU,...
・Function operation unit (first), AU2...Function operation unit (second)
)

Claims (4)

[Claims] (1) The card has an unrewritable first recording section that records different data for each card, and a second recording section that can be rewritten or additionally recorded, while the card device has the first recording section of the card. means for reading data in the recording section of the card and the second recording section; means for writing data in the second recording section; Equipped with a function calculation unit for decoding data read from the recording unit and encoding data written to the second recording unit, and mediating data in the first recording unit of the card read by the card device. The data to be recorded on the card is encoded using the function calculation unit as a variable and recorded in the second recording unit, and when reading the first record, the second record of the card read by the card device is encoded. A method for determining the validity of a card in which data read from a first recording section by the function calculation section is used as a parameter to decode the data of the second recording section of the card. Common data is set, and when the second recording section data of the card is read, the card is recognized as a valid card because the common data is included in a part of the second recording section data. A card validity determination method characterized by: (2) The card has a first recording section that is not rewritable and records data that differs from card to card, and a second recording section that can be rewritten or additionally recorded, and a portion of the data in the second recording section is included. is configured with data fixed to the card, and the card device includes means for reading data in the first recording section and second recording section of the card, means for writing data in the second recording section, and means for writing data in the first recording section and second recording section of the card. A first function operation for decoding the data read from the second recording section of the card using the data read from the first recording section as a parameter, and encoding the data written to the second recording section. and a second function operation section that decodes and encodes the remaining data in the second recording section using the specific data read from the second recording section as a parameter, and reads the record. At the time of storage, the data in the first recording section and the second recording section of the card are read 9, and the data in the second recording section is read using the first function calculation section using the data in the first recording section as a parameter. decrypt the card, extract data specific to the card from the decrypted data, and use the second function calculation unit to further extract the remaining data of the decoded data using the extracted unique data as a parameter. A method for determining the validity of a card, which is characterized in that the card is decrypted and recognized as a valid card if predetermined common data is present in the data that has been decrypted twice. (3) Claims 1 and 2, characterized in that a part of the structure of the first recording section of the card is a thin film with a non-uniform thickness that allows interference by reflected light. Card validity determination method. (4) Claims 1 and 2, characterized in that the first recording section of the card is composed of a polymer layer in which a plurality of light-transmitting materials having different squictre distributions of transmitted light are dispersed. Card validity determination method described in section.