JPH06106884A - Information recording medium, data recording method thereof, and authenticity determination method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an information recording medium capable of optically reading data and obtaining legitimate data against falsification of the data. A rewritable information recording section and a non-rewritable recording section or a print recording section are formed on a visible information recording surface of an information recording medium, and a unique ID code is recorded in the non-rewritable information recording section or the print recording section for rewriting. Secret key data is generated from the unique ID code in the type information recording section by a parameter secret to a third party and a predetermined algorithm, and the authentication code and the rewrite data generated from the secret key data and the rewrite data by the predetermined algorithm And record. As a result, the authentication code is changed every time the rewriting data is recorded. An authentication code is generated for each collation of the information recording medium, and authenticity is confirmed by comparison and collation with the previously recorded authentication code. Further, the non-rewritable information recording section is made to be an irreversible heat-sensitive recording layer, so that
The D code can be set when the card is issued.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for preventing forgery / falsification of an information recording medium having an information recording section capable of recording visible information, and in particular, a plurality of information recording sections capable of recording visible information are formed. Information recording medium and its recording method and its authenticity determination method.

[0002]

2. Description of the Related Art In recent years, a magnetic recording medium having a magnetic recording portion made of a magnetic recording material formed on a card substrate has been used as an information recording means, particularly a credit card,
It is used as a highly versatile information recording medium such as a cash card and an ID card. These can be applied to information devices and the like, which enables high-speed mass processing of information, and has been considered to be highly convenient for users. By the way, when a card such as a prepaid card (hereinafter referred to as a card) in which a certain amount of money is set as magnetic information is used, the user can know the usage status of the card by using the magnetic recording of the card. The magnetic recording layer which is the current balance by reading the information of the section with a reading device or by punching holes according to the number formed and displayed on the side edge of the card as a guide for the amount of money the card has. However, there is an inconvenience that it is only possible to know the approximate amount of money data recorded in, but not accurate information. Further, the magnetic data recorded in the magnetic recording unit cannot completely prevent falsification, alteration, and forgery, and even if the data obtained by converting the data using a certain algorithm is written, there is nothing to copy. There is a drawback of the magnetic recording medium that it has no effect.

Therefore, regarding the former, JP-A-59-1
No. 99284, JP-A-60-18388 or Japanese Utility Model Application Laid-Open No. 57-177235, the magnetic recording portion and other visible information recording means include a low melting point metal thin film layer or a thermosensitive color recording layer. Form an information recording part, and in parallel with recording on the magnetic recording part, sequentially add to the visible information recording part by heating printing using a thermal head as usage information the amount data such as prepaid amount or balance at the time of card use. Thus, it is possible to visually confirm the usage information without using a reading device. However, it is very convenient because the usage information such as transaction date, balance, etc. recorded on such a card can be accurately grasped, but in order to record the latest usage information as much as possible, Since the recording area is limited, the size of one character is inevitably reduced, and the recorded information is difficult to visually recognize.

On the other hand, as described in, for example, Japanese Patent Laid-Open No. 53-46041, which is composed of a reversible heat-sensitive recording material, heat printing using a thermal head is used to repeat coloring and erasing at specific temperatures. By forming a visible information recording part that can rewrite information with, and rewriting the usage information, the latest usage information can be displayed.
Since rewriting is possible, there is a risk of being tampered with, altered, or forged, and therefore unsuitable for recording usage information such as monetary data.

The latter is magnetically concealed and visually invisible as disclosed in Japanese Patent Laid-Open No. 622430/1987, which is a means for preventing forgery such as duplication of data by judging the validity of the magnetically recorded data in the magnetic recording section. This is a magnetic recording card in which the card-specific data that is concealed as possible, the variable data, and the security data formed according to the algorithm from this variable data and the card-specific data described above are recorded in the magnetic recording unit. There is a method in which security data formed according to an algorithm from data and card-specific data is compared and collated with security data already recorded in the magnetic recording unit to determine authenticity.

Further, as in Japanese Patent Laid-Open No. 3-212790, pixel and image position data printed on a card,
The conversion data is written to the card by encryption processing from the position data and electronic data, and the pixels printed on the card,
There is a method in which the position data of an image is detected, the conversion data is inversely converted using this position data, the registration data is taken out and collated with the registration data to determine the authenticity.

[0007]

However, in combination with the above-mentioned magnetic recording portion, a thermal recording type visible information recording portion composed of a low melting point metal thin film layer or a thermosensitive color recording layer is formed, and a prepaid amount or a balance is set for each. In a card that records monetary data as history information and allows visual confirmation of history information, the magnetic recording unit cannot completely prevent falsification of magnetic data, and the visible information recording unit is recorded. It is very convenient because you can accurately grasp the history information such as transaction date, balance, etc. However, if it is a non-rewritable type, the recording area is limited and it is necessary to add update data. Inevitably reduces the size of one character, so the recorded information is difficult to see, and the thermal recording type visible information recording unit has two problems that a third party can easily write history information. In addition, even if the visible information recording unit is rewritable, it has the characteristic that only the latest information can be displayed at all times because the information can be recorded / erased. Since the information recording unit has a problem of being tampered with, there is a risk of falsification, and it is unsuitable for recording history information such as amount data. In particular, in the case where an unreasonable gain is to be obtained by intentionally erasing or destroying magnetic data and falsifying the visible information recording portion, the above-mentioned magnetic data authenticity discriminating means cannot be used. No, you cannot get valid magnetic data for that card.

Therefore, the present invention is an information recording medium formed with a visible information recording portion capable of optically reading data, particularly visually, and obtaining legitimate data against falsification of this data. The purpose is to provide.

[0009]

DISCLOSURE OF THE INVENTION The present invention, which has been made to achieve the above object, comprises a rewritable recording section which is optically writable / readable and a non-rewritable recording section which is optically readable on a substrate. An information recording medium that is formed and has rewritable information and an authentication code in a rewritable recording section and a unique ID code in a non-rewritable recording section.

Further, the unique ID code of the optically readable non-rewritable recording section formed on the substrate is read,
Based on the rewriting information in the optically readable rewritable recording section and a predetermined algorithm, secret key data is generated from the unique ID code by using a predetermined parameter that is secret to a third party, and based on the predetermined algorithm. , A data recording method of an information recording medium for recording an authentication code generated from rewriting information using secret key data.

Further, the unique ID code of the optically rewritable non-rewritable recording portion formed on the substrate is read,
The rewriting information and the authentication code recorded in the optically readable rewritable recording unit are read, and secret key data is generated from the unique ID code by using a predetermined parameter that is secret to a third party based on a predetermined algorithm. Then, based on a predetermined algorithm, an authentication code is generated from the rewrite data using the secret key data, and the authenticity of the information recording medium is determined by comparing and collating with the authentication code recorded in the rewritable recording unit. This is a method for determining the authenticity of an information recording medium.

[0012]

According to the present invention, the rewritable information recording portion and the non-rewritable recording portion or the print recording portion are formed on the visible information recording surface of the information recording medium, and the non-rewritable information recording portion or the print recording portion is unique. An ID code is recorded, secret key data is generated from a unique ID code by a parameter and a predetermined algorithm that are secret to a third party, and rewriting of the rewritable information recording unit is performed by the secret key data and a predetermined algorithm. By recording the authentication code generated from the data, the authentication code is changed and recorded every time the rewrite data is recorded on the information recording medium. Further, it is possible to confirm the authenticity by generating an authentication code for each collation and comparing and collating with the previously recorded authentication code. In addition, by making the non-rewritable information recording section an irreversible heat-sensitive recording layer, the unique ID
The code can be set when the information recording medium (card) is issued.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a plan view of the information recording medium of the present invention, FIG. 2 is a sectional view of the information recording medium of the present invention taken along the line AA ′ of FIG. 1, and FIGS. FIG. 6 is a cross-sectional view showing an embodiment, FIG. 5 is a schematic diagram showing a data flow at the time of writing recorded on the information recording medium of the present invention, and FIG. 6 is data recorded on the information recording medium of the present invention. FIG. 7 is a schematic diagram showing a flow of data for generation / collation of an authentication code, particularly when reading, and FIG. 7 is a configuration diagram showing a configuration of a terminal device that performs data processing of the information recording medium of the present invention.

Reference numeral 1 in FIG. 1 denotes an information recording medium of the present invention, which is, for example, a prepaid card to which a predetermined value is added in advance. In this prepaid card (hereinafter referred to as a card), two magnetic recording means are formed on the same surface side in addition to the visible information recording means of the present invention for visually displaying the present value situation. Reference numeral 11 denotes a visible information recording surface for recording visible information. The visible information recording surface 11 has a rewritable information recording section 12 and a non-rewritable information recording section 13. In FIG. 2, an information recording medium 1 has a structure in which a magnetic recording layer 3, an irreversible thermosensitive recording layer 4, and a reversible thermosensitive recording layer 5 are sequentially laminated on a substrate 2, and the magnetic recording layer 3 and the reversible thermosensitive recording layer 3 are arranged. Recording layer 5
For example, rewrite data d such as the amount of money and an authentication code X described later are recorded, and a unique ID code Z is recorded on the irreversible thermosensitive recording layer 4. These data are OCR characters such as numbers, characters and marks. The irreversible thermosensitive recording layer 4 and the reversible thermosensitive recording layer 5 form the visible information recording surface 11. In this embodiment, the non-rewritable information recording section 12 is the irreversible thermosensitive recording layer 4, and the non-rewritable information recording section 13 is the reversible thermosensitive recording layer 5. In another embodiment described later, the unique ID code recorded in the rewritable information recording unit 12 may be formed by printing. Further, fixed information 8 such as a design such as a picture or a pattern, a date, a notification, etc. is arbitrarily printed on the surface of the information recording medium 1 of the present invention, for example, the transaction date, the amount of money such as yen in the rewriting data. May form a currency unit of.

If desired, an anchor layer 6 may be provided between the magnetic recording layer 3 and the irreversible thermosensitive recording layer 4 / reversible thermosensitive recording layer 5, and a protective layer 7 may be provided on the uppermost surface.

The base 2 is made of polyvinyl chloride, polyester,
Resins such as polycarbonate, polymethylmethacrylate, polystyrene and polyethylene terephthalate, paper, synthetic paper and the like can be used alone or in combination as a composite. Further, its shape can be selected according to the application such as a card shape or a sheet shape, and further, it is appropriately selected from the above materials in consideration of the physical properties required according to the application, such as strength, rigidity, hiding power, and light opacity. be able to. In the present invention, the base 2 is a so-called card having a rectangular shape,
The thickness is about 188 to 250 μm, and the material is polyethylene terephthalate (PET).

The magnetic recording layer 3 is made of a magnetic material such as γ-Fe ₂ Co ₃ , Co-coated γ-Fe ₂ Co ₃ , Fe ₃ Co ₄ , and Ba ferrite, and a synthetic resin such as vinyl chloride resin, polyester resin, urethane resin or the like. Alternatively, the coating liquid dispersed in the vehicle may be applied and dried using a coating / printing method such as a roll coating method, a knife edge method, a spin coating method, a gravure printing method, an offset printing method, a silk printing method, and a thickness of 1
It is formed with a thickness of about 0 to 15 μm.

In the present embodiment, the irreversible thermosensitive recording layer 4 may be of a dye coloring type, a metal compound coloring type, a dispersion of these in a polymer binder, or a metal removing type. In this embodiment, It is a metal removal type. The former is for recording information by coloring or discoloring by heating of a thermal printing means such as a thermal head, and the latter is a metal thin film made of a low melting point metal by heating of a thermal printing means such as a thermal head. Information is recorded by melting and removing the layer.

In the dye coloring type, the metal compound coloring type, and those in which these are dispersed in a polymer binder, (1) Dye coloring type The diazo dye is composed of a diazo compound, a coupler agent, and a basic agent. The compound has the general formula Ar-N
= N = X-M, Ar is substituted or unsubstituted phenyl, biphenyl, benzocarbazole, diphenyl sulfide, etc., X is halogen or HSO _4, etc., M is zinc chloride, cadmium chloride, tetra Boron fluoride or the like. The coupler agent is a substituted or unsubstituted phenol,
Naphthol, resorcin, catechol and the like, and basic agents include urea, thiourea, guanidine and the like. Further, it is composed of a combination of a color developer having a phenolic hydroxyl group and a leuco dye, and examples of the leuco dye include crystal violet lactone, 3-indolino-3-p-dimethylaminophenyl-6-dimethylaminophthalide, and 3
-Diethylamino-7-chlorofluorane, 2- (2-
Chlorophenylamine) -diethylaminofluorane,
2- (2-fluorophenylamino) -6-diethylaminofluorane, 2- (2-fluorophenylamino)
-6-Di-n-butylaminofluorane, 3-diethylamino-7-cyclohexylaminofluorane, 3-diethylamino-5-methyl-7-t-butylfluorane, 3-diethylamino-6-methyl-7-ani Rinofluorane, 3-diethylamino-6-methyl-7-p-
Butylanilinofluorane, 3-cyclohexylamino-6-chlorofluorane, 2-anilino-3-methyl-
6- (n-ethyl-p-toluidino) -fluorane, 3
-Pyrrolidino-6-methyl-7-anilinofluorane,
3-pyrrolidino-7-cyclohexylaminofluorane, 3-n-methylcyclohexylamino-6-methyl-7-anilinofluorane, 3-n-ethylpentylamino-6-methyl-7-anilinofluorane, etc. Can be used. Further, as the color developer, 4,4′-isopropylidenephenol, benzyl-p-hydroxybenzoate, 4,4′-dihydroxy-3,5′-diallyldiphenylsulfone, methyl-bis (hydroxyphenyl) acetate, gallic acid Esters, p-phenylphenol and the like can be used.

(2) Metal compound coloring type As the metal compound coloring type, ferric stearate
Combination of ferric myristylate with tannic acid / gallic acid, Ag / Pb / Hg / Th salt of oxalic acid with thiouric acid / sodium thiosulfate, Ni / Co / Cu salt of stearic acid and CaS / SrS・ A combination with BaS, a combination of silver oxalate / mercury oxalate and glycerine / polyhydroxy alcohol, a combination of silver behenate / silver stearate and hydroquinone / spiroindan, ferric laurate / ferric pelargonate and Combination with thiosemicarbazides, combination of lead caproate / lead behenate and thiourea derivative, combination of ferric stearate / copper stearate with lead dibutylthiocarbamate, nickel acetate and thiooxalic acid / thioacetamide Combination of organic amine molybdate and polyvalent aromatic Combination of a Dorokishi compounds can be used.

The polymer binder as a binder may be a methacrylic resin such as hydroxyethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, starch, styrene-maleic acid copolymer, polymethylmethacrylate / polyethylmethacrylate alone. Alternatively, a copolymer, polystyrene, an acrylic-styrene copolymer, a polyester resin, a chroman resin, an ABS resin, nitrocellulose or the like can be used.

The above-mentioned dye-coloring type and metal compound-coloring type are respectively dispersed in a polymer binder as a binder, and an appropriate forming method such as a roll coating method, a knife edge method, a spin coating method, a gravure method is used. It is formed by coating and drying using a coating / printing method such as a printing method, an offset printing method, a silk printing method or the like to have a thickness of about 3 to 8 μm.

In the metal removal type, tin, bismuth, tellurium, cadmium, indium, aluminum,
Low melting point metals such as lead and zinc and their alloys can be used,
The thickness is appropriately selected in consideration of toxicity, usage conditions, etc., and is formed to a thickness of about 500 to 1000 μm by using a forming method such as a vacuum deposition method, a sputtering method, and a plating method.

In the present invention, the reversible thermosensitive recording layer 5 is made of a material which exhibits different states depending on the heating temperature by heating by a heating printing means such as a thermal head. The different state means, for example, an optically different state in which it becomes cloudy when the temperature is T2 or higher and becomes transparent when the temperature is T1 or higher and lower than T2 (where T1 <T2). According to this
Information is visibly recorded by heating and printing at a temperature of T2 or higher by a heating and printing means such as a thermal head, and when the rewritable recording layer 5 is heated at T1 or higher and lower than T2, the clouded portion becomes transparent, This allows the information to be erased. By repeating recording and erasing in this way, the visible information can be rewritten on the visible information recording surface.

The reversible thermosensitive recording layer 5 is formed by dispersing a low molecular weight substance in a polymer resin or by dissolving the high molecular weight resin and the low molecular weight substance in an organic solvent. Is polyvinyl chloride resin; vinyl chloride-
Vinyl acetate copolymers, vinyl chloride-acrylate copolymers, vinyl chloride-vinyl acetate-vinyl alcohol copolymers, vinyl chloride copolymers such as vinyl chloride-vinyl acetate-maleic acid copolymers, polyvinylidene chloride, chloride Vinylidene chloride-vinyl chloride copolymers, vinylidene chloride-acrylonitrile copolymers and other vinylidene chloride copolymers; polyamide resins; silicone resins; polyacrylate or polymethacrylate resins or their copolymers, etc. A mixture of two or more kinds is used.

The low molecular weight substances include higher alcohols such as alkanols, carkanediols, halogenalkanols and halogenalkanediols; higher aliphatic amines; alkanes, alkenes, alkynes and halogen-substituted products thereof; cycloalkanes, cycloalkenes, cyclones. Cyclic compounds such as alkynes; saturated carboxylic acids, unsaturated monocarboxylic acids, dicarboxylic acids or their esters, amides, ammonium salts; acrylic carboxylic acids or their esters, amides, ammonium salts; thioalcohols or their carboxylic acid esters; thiocarboxylic There are acids or their esters, amides, and ammonium salts, and these may be used alone or in combination of two or more. Then, the coating liquid containing these is applied to a coating / printing method such as a spin coating method, a roll coating method, a knife edge method, an offset printing method, a gravure printing method, or a screen printing method to obtain a thickness of 5 to 10
It is formed to about μm.

The protective layer 7 has a protective effect against scratches and scratches from the outside.
Carboxymethyl cellulose, polyvinyl alcohol, starch, styrene-maleic acid copolymers, homopolymers or copolymers of methacrylic resins such as polymethylmethacrylate / polyethylmethacrylate, polystyrene, acrylic-styrene copolymers, polyester resins, chroman resins , ABS resin, resin such as nitrocellulose, fluorine resin, resin mixed with silicon resin, UV offset ink, etc. are appropriately selected in consideration of abrasion resistance and slipperiness, and spin coating method, roll coating method, A coating / printing method such as a knife edge method, an offset printing method, a gravure printing method, or a screen printing method is used to form a film having a thickness of about 1 to 5 μm.

The anchor layer 6 is provided to improve the adhesion of the irreversible thermosensitive recording layer 4 to the magnetic recording layer 3, and is a resin having a good affinity with the irreversible thermosensitive recording layer 4, such as hydroxy. A homopolymer or copolymer of methacrylic resin such as ethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, polymethylmethacrylate / polyethylmethacrylate, or polyester resin is used, and a coating method such as a spin coating method, a roll coating method, or a knife edge method. Is used to form a film having a thickness of about 1 to 5 μm.

FIGS. 3 and 4 show other embodiments of the information recording medium of the present invention, and the construction of the information recording medium of the present invention is not limited to these. 3 is the same as that shown in FIG. 1 except that the irreversible thermosensitive recording layer 4 is not provided and the print recording section 17 recording the unique ID code Z ′ is formed by a printing method such as offset printing, silk printing or gravure printing. It is the same as the information recording medium. Further, FIG. 4 is the same as the configuration of the information recording medium of FIG. 1 or 3 except that the magnetic recording layer 3 is not provided.

The flow of data recorded on the information recording medium 1 of the present invention will be described with reference to FIGS. As shown in FIG. 5, when writing data, according to this, the unique ID code Z set when the card is issued, the prepayment balance,
The rewrite data d such as the last transaction date is recorded in the rewritable information recording unit 12, the unique ID code Z is read, and the prepayment balance is updated by using the transaction data such as the payment amount and new rewrite data d. To generate. This rewriting data d
(Note that the rewriting data may be only the prepaid balance or only the transaction date), and the authentication code X is generated as follows. First, a predetermined algorithm f is calculated from the parameter P and the unique ID code Z that are secret to a third party.
Based on K, the secret key data K unique to the card represented by K = f (Z, P) is generated, and based on the predetermined algorithm f from this secret key data K and the rewriting data d, X = f (d, An authentication code X represented by K) is generated. In this case, the authentication code X is the rewrite data d such as the prepaid balance and the last transaction date.
And the parameter P is unknown,
Almost difficult to decipher.

The rewriting data d such as the authentication code X, the prepaid balance, and the last transaction date is recorded in the rewritable information recording section 12.

The algorithm f used at the time of data generation may be different from that at the time of generation of the card-specific secret key data K and at the time of generation of the authentication code X.

FIG. 6 shows a flow of data for generation and verification of the authentication code X, particularly when reading data, in which the rewriting data d ′ such as the prepayment balance and the last transaction date is read from the rewriting type information recording unit 12, Similarly, the authentication code X ′ is generated. First, the parameter P that is secret to a third party
The card-specific secret key data K represented by K = f (Z, P) is generated from the unique ID code Z and the unique ID code Z, and the predetermined algorithm is calculated from the secret key data K and the rewriting data d. An authentication code X ′ represented by X = f (d ′, K) is generated based on f. The authentication code X recorded from the rewritable information recording unit 12 is read out, and this is compared and collated with the generated authentication code X ′ to determine the authenticity.

FIG. 7 shows a terminal device 30 for writing to and reading from the information recording medium 1 of the present invention.
2 shows a schematic configuration of. A to F show the flow of each data. Reference numeral 31 denotes a known reader / writer device that writes data in the information recording medium 1 and reads data from the information recording medium 1, and includes a magnetic head that writes and reads data in a magnetic recording unit (not shown), and magnetic data writing. A rewritable information recording unit 1 having a read circuit
2 has a thermal head (heating means) for selectively writing and erasing data and its control circuit, and an optical reading means such as a CCD camera for reading and its control circuit. These are arbitrarily selected based on the configuration of the device.

Reference numeral 32 denotes a data processing device, the processing contents of which are determined according to the use of the device. In this embodiment, the prepaid balance data is updated according to the usage amount based on the use of the prepaid card. The data processing device 32 is connected to an input device 33, which is a device for inputting data used for updating prepaid balance data, such as a usage amount, and a display device 34, which is a device for displaying the progress of data processing. 33
Is connected to a keyboard or an external storage device, and data is input online or offline. As the display device 34, a known CRT, LCD or the like is used.

Reference numeral 35 denotes an encryption device, which has secret key data K,
The authentication data X is generated by the method described above. Furthermore, the IC card I that stores the parameter P sent to the encryption device 35 when the secret key data K is generated, and the IC card reader / writer 36 that reads the parameter P from the IC card I
Are connected. The IC card I cannot be accessed from the outside.

The writing of data in the terminal device 30 is performed from the non-rewritable information recording section of the information recording medium 1 to the unique I
The rewrite data d (data A) / authentication code X including the transaction date, the balance, etc. is read from the D code Z and the rewritable information recording unit, and the unique ID code Z and the rewrite data d (data B) are transferred to the encryption device 35. Then, the authentication code X ′ (data C) is generated, and after comparison and collation, the updated rewriting data d ′ and the unique ID code Z (data D) are sent to the encryption device 35,
The authentication code X ″ (data E) is generated, and the updated rewriting data d ′ / authentication code X (data F) is written in the rewritable information recording unit of the information recording medium 1 by the reader / writer device 31.

On the other hand, for verification, the authentication code X is read at the same time as the rewriting data d consisting of the unique ID code Z, the transaction date and the balance when updating the data, and the unique ID code Z and the transaction date and the balance are read by the above method. The authentication code X ′ is generated from the rewrite data d consisting of, and the authentication code X and the authentication code X ′ are collated, and it is determined whether or not they match. If they match, the data update of the card is permitted at the time of data update, and the rewrite data d as described above.
And the new rewrite data d ′ and the authentication code X ″ generated based on the rewrite data d ′ are written in the rewritable information recording section of the information recording medium 1. If they do not match, the handling of the card is rejected. .

In particular, in the present invention, a magnetic recording unit (not shown) may be combined and the data processing performed in the rewritable information recording unit of the above-described embodiment may be similarly performed, or only the rewritable data may be recorded, Regarding generation and verification of the authentication code, the rewriting data / authentication code of the rewritable information recording section and the unique ID code of the non-rewritable information recording section may be used to compare and verify the authentication code.

Further, the data in the rewritable information recording section which is optically read / written when the magnetic recording section is destroyed for some reason can be used as a backup. For example, even if the magnetic recording unit is destroyed for some reason and the rewrite data in the rewritable information recording unit may be tampered with, the authentication code X and the unique ID code Z
Also, it is possible to know the presence or absence of tampering by comparing and collating the authentication code X'calculated from the rewriting data d, and even if the authentication code X is tampered with, it does not match the authentication code X'and is an invalid card. Can prevent use. Further, the data in the magnetic recording section can be reproduced from the data in the rewritable information recording section. When the data in the rewritable information recording unit is used for collation, the operator visually confirms each data and manually inputs the necessary data from the input device 33, and the obtained authentication code X ′ and the card are input to the card. By checking the displayed authentication code X, the presence or absence of falsification can be confirmed. Furthermore, if the authentication code X is entered at the same time as the data entry, it is possible to confirm the authenticity determination on the display device 34.

The data recorded in the above-mentioned optically writable and readable rewritable recording section may be code data such as a bar code and a Carla code in addition to the OCR character, and these should be written together with the OCR character. As a result, the data can be viewed and the code data reader can be made simple and inexpensive.

[0042]

As described above, according to the present invention, the authentication code and the rewriting data are recorded in the rewritable information recording section of the information recording medium, and the unique ID code is recorded in the non-rewritable information recording section or the print recording section. Since it is recorded, by comparing and collating the already recorded authentication code with the newly generated authentication code, even if the rewrite data has been tampered with, the tampering can be easily found from the mismatch of the authentication codes. .
Further, by updating and recording the rewriting data in the rewriting-type information recording section, it is possible to always display the latest data of the history information, and the card user can easily confirm the balance. Further, even when combined with a magnetic recording unit, even if magnetic data is copied, it is possible to detect forgery by copying by comparing and collating the authentication code. Further, even if the magnetic recording portion is destroyed, the destroyed data can be easily reproduced by using the rewriting data of the rewritable information recording portion.

[Brief description of drawings]

FIG. 1 is a plan view of an information recording medium of the present invention.

FIG. 2 is a sectional view of the information recording medium of the present invention taken along the line AA ′ in FIG.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a schematic diagram showing a flow of data at the time of writing recorded on the information recording medium of the present invention.

FIG. 6 is a schematic diagram showing a data flow when generating and collating an authentication code, particularly when reading data recorded on the information recording medium of the present invention.

FIG. 7 is a configuration diagram showing an example of a configuration of a terminal device that performs data processing of the information recording medium of the present invention.

[Explanation of symbols]

 1, 10 and 20 Information recording medium 2 Base 3 Magnetic recording layer 4 Irreversible thermosensitive recording layer 5 Reversible thermosensitive recording layer 6 Anchor layer 7 Protective layer 8 Fixed information 11 Visible information recording surface 12 Rewritable information recording part 13 Non-rewritable type Information recording unit d Rewriting data X, X ', X "Authentication code Z, Z' Fixed ID code 17 Printing recording unit 30 Terminal device 31 Reader / writer device 32 Data processing device 33 Input device 34 Display device 35 Cryptographic device 36 IC card reader Writer I IC card

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location G06K 19/10 G07F 7/12 7/08 9256-3E G07F 7/08 B 9256-3EM (72 ) Inventor Kazuya Hirano 1-11-2 Higashikanda, Chiyoda-ku, Tokyo Inside U-Card Co., Ltd.

Claims (7)

[Claims] 1. A rewritable recording section that is optically writable and readable and a non-rewritable recording section that is optically readable are formed on a substrate, and the rewritable recording section has rewrite data and authentication. An information recording medium having a code, wherein the non-rewritable recording section has a unique ID code. 2. The rewritable information recording part is a reversible thermosensitive recording layer, which comprises an organic low molecular weight substance as a main component in a resin material when heated and whose transparency reversibly changes depending on temperature.
The information recording medium according to claim 1, wherein the non-rewritable information recording section is a print recording layer formed by printing. 3. The rewritable information recording section is a reversible thermosensitive recording layer, which comprises an organic low molecular weight substance as a main component in a resin material when heated and whose transparency reversibly changes depending on temperature.
2. The information recording medium according to claim 1, wherein the non-rewritable information recording section is a heat-sensitive coloring layer that develops color when heated or an irreversible heat-sensitive recording layer that includes a metal thin film layer that is melted and removed by heating. 4. The information recording medium according to claim 1, wherein a magnetic recording portion is formed on at least a part of the substrate. 5. The information recording medium according to claim 4, wherein the magnetic recording portion formed on at least a part of the base has rewriting data, an authentication code, and a unique ID code. 6. A unique ID code of an optically readable non-rewritable recording section formed on a base is read, and the optically readable rewritable recording section is rewritten based on rewriting data and a predetermined algorithm. Generating secret key data from the unique ID code using a predetermined parameter that is secret to the three parties, and recording an authentication code generated from the rewrite data using the secret key data based on a predetermined algorithm. A method for recording data on an information recording medium characterized by the above. 7. A unique ID code of an optically readable non-rewritable recording section formed on a substrate is read, and rewriting data and an authentication code recorded in the optically readable rewritable recording section are read. A secret key data is generated from the unique ID code using a predetermined parameter that is secret to a third party based on a predetermined algorithm, and an authentication code is generated from the rewrite data using the secret key data based on a predetermined algorithm. And authenticating the information recording medium by comparing and collating with the authentication code recorded in the rewritable recording unit.