JP2003016419A - Card with high security - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a card with high security which is very difficult to illegally use. SOLUTION: The card has a 1st recording medium where noise factors are distributed at random and a 2nd recording medium which has no noise factor and some of the noise factors which are distributed at random are taken in from a specific area of the 1st recording medium to generate a random number which can be neither forged nor predicted, thereby obtaining the high security.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new card settlement system, and it is almost impossible to forge a card, and even if the card is forged, it is rare to use the card. Provide a card with high security that cannot be beaten.

[0002]

2. Description of the Related Art Conventionally, a magnetic card, an IC card, or a combination of a magnetic card and an IC card is used.
Payments for shopping and credit transactions are in progress. However, under the current situation, card information and personal information of other people's cards are stolen and misused, and various measures are taken.However, forged and illegally used cards are left behind. Don't

[0003]

Conventionally, payment of a card was performed using a random number, but the regularity of the random number was read, past transactions were decrypted, and the card was illegally used. The present invention provides a card with high security in which such unauthorized use is extremely difficult.
The present inventor uses a card having a first recording medium in which noise factors are randomly distributed and a second recording medium in which noise factors are not present, whereby noise factors are randomly distributed. Is unique to the card (ID
The present invention has been completed by discovering that the noise factor distributed randomly gives random numbers having no regularity.

[0004]

The present invention uses a card having a first recording medium in which noise factors are randomly distributed and a second recording medium in which no noise factors are present.
For example, in a compound having azobenzene in the molecule, the azo bond portion undergoes cis-trans conversion when exposed to light of a specific wavelength. Compounds that react to light in this way are called chromic compounds. Furthermore, if such a chromic compound is made into fine particles and dispersed in a liquid crystal and stored in a transparent plate, azobenzene will be cis-
Optical information can be stored by causing a transformer conversion. However, it is known that about several percent of the fine particles of the recording medium containing such a chromic compound have already undergone cis-trans conversion by the light received in normal life. The distribution of the fine particles is not uniform, and the distribution of the fine particles that have already undergone cis-trans conversion is not uniform. If attention is paid to the distribution of the fine particles, all recording media using the chromic compound are the same. It can be said that there is no. Also, if a small amount of the second particles is added to the first particles and the two types of particles are mixed with a binder and then dried, the two types of particles are almost diffused by heat and have the same distribution. I don't. A specific part of this random noise factor, for example, a specific pattern of a specific area as shown in FIG. 1, is used as one of the card information (ID
If you record it as (information), most of the same things can not be done, so it will help prevent forgery of the card. The material of the first recording medium is a conventional CD-R, CD-RL or MO.
The material of the optical recording medium may be randomly distributed as a noise factor in the optical recording medium constituting the above.

The present inventor utilizes minute particles of a recording medium as a noise factor, and replaces a noise factor between a plurality of noise factors with a 1,0 signal with a particle size almost the same as the noise factor, A random number generation source was created by writing random numbers separately among the noise factors via the noise factors.
That is, as shown in FIG. 2, for example, a part A of the noise factor distribution shown in FIG. 1 is specified in a specific area of the first recording medium, and here, a random number N1 represented by a 1,0 signal is specified. , C
Write between noise factors as shown in. Then, for example, if black is set to 1 and white is set to 0 and each noise factor is read out, a new 1,0 signal, that is, a new random number (N2) can be created. This can be considered as a natural random number because the noise factors are random.

Further, in the present invention, a second recording medium in which no noise factor is present, that is, a single recording medium material is used together. As the second recording medium, conventionally used optical recording materials such as CD-R, CD-RL, MO, etc., magneto-optical recording materials and magnetic recording medium materials can be used. A recording medium is preferably used.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The card substrate of the present invention includes synthetic resins such as polyvinyl chloride, polyester, polycarbonate, polymethyl methacrylate, polystyrene and polyethylene terephthalate, natural resins, paper, synthetic paper, metal, ceramics, etc. Can be used alone or in combination as a complex. Further, its shape can be selected according to the application such as a card shape or a sheet shape, a film shape, and further, physical properties required according to the application, such as strength and rigidity,
The material can be appropriately selected from the above materials in consideration of the hiding property, the light opacity and the like.

In the present invention, as the recording medium, both a recording medium in which writing can be performed many times and a recording medium in which writing can be performed only once can be used. As such a material, a known recording material is used. For example, it is a material which undergoes reversible state change upon irradiation with a laser beam described in JP-A-2000-298878. In particular, a compound that causes a reversible phase change between an amorphous state and a crystalline state is preferable, and any known compound such as a chalcogen compound or a single chalcogen can be used. Te, Se, Ge-Sb-T
e, Ge-Te, Sb-Te, In-Sb-Te, Ag
-In-Sb-Te, Au-In-Sb-Te, Ge-
Sb-Te-Pd, Ge-Sb-Te-Se, In-S
b-Se, Bi-Te, Bi-Se, Sb-Se, Sb
-Te, Ge-Sb-Te-Bi, Ge-Sb-Te-
Examples thereof include systems containing Co, Ge-Sb-Te-Au, and systems in which gas additives such as nitrogen and oxygen are introduced into these systems. Also, Japanese Patent Laid-Open No. 2000-285505
Photochromic materials such as those disclosed in the publication can be used. For example, there are diarylethene compounds. The photochromic reaction represented by the photochromic material means that the photochromic material in the A state is irradiated with light having a wavelength λ1 having an absorption in the A state to generate a B state having absorption of a different wavelength light. , B is the reversible reaction of returning to the original A state by irradiating the photochromic material in the B state with light having a wavelength λ2 in which the B state has absorption. Therefore, in the optical recording medium 5 which is a photochromic medium, rewriting of information can be performed by making the state A and the state B correspond to the information unrecorded state, the information recorded state or the information recorded state and the information unrecorded state, respectively. It becomes a possible optical recording medium. Furthermore, JP 2000
Optical recording medium materials such as those disclosed in JP-A-263936 can also be used. That is, at least one element selected from Au, Ag, and Cu of the Ib group and In of the IIIb group,
At least one element selected from Ga and Al, and Vb
At least one element selected from the group Sb, Bi and N and at least one element selected from the group VIb Se and Te, and SbCl which is a chloride of Sb
_3, SbBr _3, and at least one compound selected from SbI _3, by using a material obtained by adding LiNbO ₃ as an oxide of Al ₂ O ₃ or Li and Nb and Al oxide, the wavelength 400nm~680nm Improves the recording sensitivity and erasing ratio for electromagnetic waves, especially laser light,
A recording medium having good repeatability is realized.

The magnetic recording material is a conventional magnetic material, which is mainly composed of Co, and Cr, Pt, T
It is possible to include at least two kinds of elements selected from a and Nb, the film structure of which is made of Co crystal grains, and the other elements are segregated at the crystal grain boundaries.
Alternatively, Co is the main component and its film structure is composed of Co crystal grains, and silicon oxide, aluminum oxide,
At least one compound selected from silicon nitride, chromium oxide, tantalum nitride, and aluminum nitride may be present. Furthermore, Co alone or C
At least 1 selected from silicon nitride, aluminum nitride, silicon oxide, aluminum oxide, and titanium nitride in an alloy containing at least two elements selected from Ta, Pt, Cr, Ti, Ni, and Nb in o. A film in which a compound of a kind is dispersed or at least one kind of compound selected from silicon nitride, aluminum nitride, silicon oxide, aluminum oxide, and titanium nitride is used, and Co alone or Co is Ta, Pt, Cr, T.
It may be a film in which an alloy containing at least two kinds of elements selected from i, Ni and Nb is dispersed.

Ferromagnetic magnetic particles usable as a noise factor in the present invention include γ-Fe2O3 and γ-Fe2O.
Mixed crystal of 3 and Fe3O4, γ-Fe2O3 coated with cobalt
Alternatively, ferromagnetic oxides such as Fe2O4 and barium ferrite, and ferromagnetic alloy powders such as Fe-Co and Fe-Co-Ni can be used.

Since it is difficult to mix ferromagnetic particles uniformly with magnetic particles, non-magnetic materials (for example, ITO, Z) are used.
nO: conductive oxide such as Al, or Si or M
It is also possible to mix the same with particles of compound semiconductor such as AlN or GaN doped with g and the like, apply it to the card base material beforehand and dry it, and then provide a normal magnetic film thereon.

In the present invention, the diameter of the fine particles which are the storage unit of the recording medium is not particularly limited as long as it can be recognized by the recognition device. However, it is desirable that the diameter of the fine particles that are the storage unit of the miscellaneous recording medium be approximately the same as the size of the sound factor. Further, in the present invention, a protective film layer may be provided to protect the surface of the recording medium. For example, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, starch, styrene-maleic acid copolymer, homopolymer or copolymer of methacrylic resin such as polymethylmethacrylate / polyethylmethacrylate, polystyrene, acrylic-styrene copolymer, acrylic. Resin, polyester resin, chroman resin, ABS resin, nitrocellulose resin, fluorine resin, resin mixed with silicon resin as it is, or dissolved or dispersed in a solvent such as toluene or xylene, spin coating method The protective layer 4 having a thickness of about 1 to 5 μm is formed by using a coating / printing method such as a roll coating method, a knife edge method, an offset printing method, a gravure printing method, or a screen printing method.
To form. Further, a thermosetting resin, an ultraviolet curable resin, a curable resin such as an electron beam curable resin, or an ink-forming resin can be used. D as a particularly hard protective film
There is LC (diamond like carbon).

The present invention can have a wide variety of embodiments. To give a typical example, mixing 1 or 0 of a non-rewritable first particle (noise factor: 1 or 0 as it is) with a second particle of 1 or 0 can be rewritten, Due to the diffusion phenomenon due to heat in the natural world, two kinds of particles are randomly distributed. A recording medium in which these two types of particles are randomly distributed is used as a first recording medium, and information to be kept secret, that is, ID information and, in some cases, personal information is written therein. Also,
A second recording medium composed of only second particles that can be rewritten to 1 or 0 is created, and card information is written therein. In the first recording medium, an array of two types of particles is read, and the second particles existing between the first particles already having a signal of 1 or 0 are generated with random numbers scattered. Write by replacing it with a signal of 1 or 0. And
A new random number can be obtained by reading the first particle and the second particle sequentially or non-sequentially.

The embodiments of the present invention are summarized as follows. (1) A card with high security having a first recording medium in which noise factors are randomly distributed and a second recording medium in which noise factors do not exist on the card surface. (2) A card with high security as described in 1 above, which is a non-rewritable recording medium having a noise factor of 1 or 0. (3) The card with high security described in the above 1, which is a recording medium in which the noise factor can be rewritten to 1 or 0. (4) A card having high security as described in 1 above, wherein the first recording medium is composed of recording medium particles of 1 or 0 that cannot be rewritten and recording medium particles that can be rewritten of 1 or 0. (5) The card with high security as described in 1 above, wherein the first recording medium and / or the second recording medium has a multilayer structure. (6) A card with high security as described in any one of 1 to 5 above, wherein the first recording medium is an optical recording medium and the second recording medium is a magnetic recording medium. The card with high security described in any one of 1 to 5 above, wherein the first recording medium is a magnetic recording medium and the second recording medium is a magnetic recording medium.
A card with high security as described in any one of 1 to 7 above, wherein a wear-resistant protective film is provided on the surface of the first recording medium and / or the second recording medium. (9) A card with high security as described in any one of 1 to 7 above, wherein the first recording medium and the second recording medium are on the same side of the card. (10) A card having high security as described in any one of 1 to 7 above, wherein the first recording medium and the second recording medium are on different sides of the card.

[0015]

EXAMPLES Various embodiments of the present invention are conceivable, and typical ones will be described below, but it goes without saying that the present invention is not limited to these. (Creating a card 1) As shown in FIG.
First, in a volatile solvent containing an adhesive, as the first recording medium 2, the first optical recording particles (noise factor) of 1 or 0 having an average particle diameter of 2 μm that cannot be rewritten and the average particle diameter of 2 μm are used.
Second optical recording particles that can be rewritten to 1 or 0 of m are mixed at a mass ratio of 8:92 until uniform,
Then it is applied to the card and dried at room temperature. Further, a second recording medium 3 composed of only magnetic recording particles which can be rewritten to 1 or 0 having an average particle diameter of 1 μm is prepared. (Creating a card 2) Azobenzene having an average particle diameter of 2.0 μm is a commercially available liquid crystal, and azobenzene: liquid crystal is 1 by mass.
Card composed of a first recording medium 2 dispersed at a ratio of 0:90, and a second recording medium 3 composed of only magnetic recording particles which can be rewritten to 1 or 0 having an average particle diameter of 2.0 μm. To create. (Creating a card 3) A card substrate 1 was coated with a volatile solvent containing an adhesive, and the first recording medium 2 had an average particle size of 0.
First magnetic recording particles (noise factor: ferromagnetic material) of which the rewriting of 1 or 0 of 05 μm is not possible, and an average particle diameter of 0.0
Second magnetic recording particles of 5 μm, which can be rewritten to 1 or 0, are mixed in a mass ratio of 5:95, mixed until uniform, and then coated on a card and dried at room temperature.
Similarly, a second recording medium 3 composed of only magnetic recording particles having an average particle diameter of 0.05 μm and rewritable to 1 or 0 is prepared. When you pass the finished card through the magnetic field,
Only the first magnetic recording particles (noise factor: ferromagnetic material) are magnetized. (Preparation of Card 4) A binder solution containing 5% by mass of ferromagnetic magnetic particles having an average particle diameter of 0.2 μm and 95% by mass of nonmagnetic particles was applied to the surface of the card substrate 1 and dried. A binder solution consisting of only magnetic particles having an average particle diameter of 0.1 μm and having a mass ratio of 20 times that of the ferromagnetic magnetic particles was prepared and applied to the surface of the coating film of the ferromagnetic magnetic particles and the non-magnetic material. Dried. Passing the resulting card through a magnetic field magnetizes only the underlying ferromagnetic material. (Preparation of Card 5) The card prepared in Example 3 was placed in a vacuum device, and sputtering was performed on the entire surface on which the magnetic recording material was prepared. The sputtering conditions are as follows: input DC power density is 1000 W / 150 mmφ, discharge gas pressure is 30 m
Torr was used as the sputtering gas. As the protective film, a DLK carbon film was formed to a film thickness of 10 nm.

(Description of system using card) FIG. 4
It will be described in detail based on. The recognition device (terminal computer) reads the ID information from the prepared card having the first recording medium and the second recording medium. The ID information is written in the first recording medium, the writing location is stored in the second recording medium, and the ID information is read out in synchronization with the writing information in the second recording medium or the first recording medium. The read ID information is sent to the host computer. The host computer judges the sent ID information and recognizes that this card has been approved. The host computer sends a transaction start signal to the recognition device (terminal computer). The terminal writer writes the random number N1 in the first recording medium. Random number N1 written in the first recording medium
Are written on a first recording medium (optical recording medium) in which noise factors are randomly distributed. Written random number N
No. 1 has a noise factor between them, so a new random number N2 is created when the noise factor is read by the terminal reader.
The recognition device (terminal computer) recognizes the generated new random number N2 and sends N2 to the host computer. When the host computer recognizes the new random number N2 sent, it sends a transaction content write start signal to the recognition device (terminal computer). Recognition device (terminal computer)
Inputs the transaction content and sends an information signal of the transaction content to the host computer. Based on the transaction content information sent to you,
The host computer writes in a book on the computer to settle the payment and sends an end signal to the recognition device (terminal computer). Depending on the case, the following process is added. Further, the host computer specifies the next transaction start random number N3 and sends it to the recognition device (terminal computer). The recognition device (terminal computer) writes the random number N3 in the first recording medium, and writes the random number N3 in the second recording medium synchronized with the first recording medium. Remove the card from the recognition device (terminal computer).

[0017]

The card of the present invention is a card having a first recording medium in which noise factors are randomly distributed and a second recording medium in which no noise factor is present. By incorporating a part of the noise factors randomly distributed from the specific area of the medium as ID information, it is impossible to forge and a random number N2 that cannot be predicted by anyone can be created. Compared to the conventional card, we were able to improve security significantly.

[Brief description of drawings]

FIG. 1 is a plan view of a card of the present invention.

FIG. 2 is a specific area noise factor distribution diagram of the first recording medium.

[Fig. 3] Schematic diagram of random number generation

FIG. 4 is a route diagram of a system using the card of the present invention.

[Explanation of symbols]

1 card board 2 First recording medium 3 Second recording medium

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 5/02 G11B 20/10 H 5D091 5/80 G06K 19/00 R 13/04 G07F 7/08 A 20 / 10 G06K 19/00 F F term (reference) 2C005 HA04 HB09 HB20 JA03 JA12 JA13 JB40 KA01 KA15 KA32 3E044 BA04 DA01 DC05 DD02 5B035 AA15 BB02 BB03 BB11 5D006 BB08 DA01 FA09 5D044 01 HH01 HH02 JJ21

Claims (10)

[Claims] 1. A card with high security having a first recording medium in which noise factors are randomly distributed and a second recording medium in which noise factors do not exist on a card surface. 2. The card with high security according to claim 1, wherein the recording medium is a non-rewritable recording medium having a noise factor of 1 or 0. 3. A card with high security according to claim 1, wherein the card is a recording medium in which the noise factor can be rewritten to 1 or 0. 4. The card with high security according to claim 1, wherein the first recording medium is composed of recording medium particles which cannot be rewritten with 1 or 0 and recording medium particles which can be rewritten with 1 or 0. 5. The card with high security according to claim 1, wherein the first recording medium and / or the second recording medium has a multilayer structure. 6. The first recording medium is an optical recording medium,
The card with high security according to any one of claims 1 to 5, wherein the second recording medium is a magnetic recording medium. 7. The first recording medium is a magnetic recording medium,
The card with high security according to any one of claims 1 to 5, wherein the second recording medium is a magnetic recording medium. 8. A card with high security according to any one of claims 1 to 7, wherein a protective film is provided on the surface of the first recording medium and / or the second recording medium. 9. The card with high security according to claim 1, wherein the first recording medium and the second recording medium are on the same side of the card. 10. The first recording medium and the second recording medium,
A card with high security according to any one of claims 1 to 7, which is on different sides of the card.