JP3947027B2 - Authentication system and authentication method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a personal authentication method using an optical device.
[0002]
[Prior art]
Conventionally, personal authentication in the field of security management has been performed using a password, a personal identification number, a so-called ID card possessed by each individual, and the like. Recently, an ID card using an IC card or the like has come out, but many use a magnetic medium or the like. An ID card using a magnetic medium has a problem that it can be easily copied because the structure of the magnetic medium itself is simple, and illegal ID cards are spread.
[0003]
Also, IC cards and magnetic cards are vulnerable to strong electricity and magnetism, and the contents may be destroyed. There have been various other authentication systems in the past, but many others can imitate them, and there has never been a personal authentication system with a high degree of security.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the conventional problems as described above, and an object thereof is to provide an authentication system, an authentication method, and the like that cannot be imitated by others and have a very high security level.
[0005]
[Means for Solving the Problems]
According to claim 1 of the present invention, an authentication cell consisting of a resin having optical transparency and small pieces with metallic luster dispersed in the resin and having plane portions and arranged in random directions is used for light. A light irradiating means for irradiating the light, an angle changing means for relatively changing an angle of incidence of light irradiated by the light irradiating means on the authentication cell, and an angle of light incident on the authentication cell by the angle changing means. When continuously changing, reflected light locus detecting means for detecting a two-dimensional reflection locus of light reflected by the small pieces, and the reflected light locus detected by the reflected light locus detecting means are stored in advance. There is provided an authentication system comprising authentication means for performing authentication by determining whether or not a locus is the same as a locus .
[0006]
According to claim 2 of the present invention, light is applied to an authentication cell consisting of a resin having optical transparency and small pieces with metallic luster arranged in a random orientation and dispersed in the resin and having a plane portion. A light irradiation step for irradiating, an angle changing step for relatively changing an incident angle of light irradiated by the light irradiating step to the authentication cell, and an angle for incident light entering the authentication cell by the angle changing step are continuously provided. When the reflected light trajectory is detected, a reflected light trajectory detecting step for detecting a two-dimensional reflected trajectory of the light reflected by the small piece, and a trajectory in which the reflected light trajectory detected by the reflected light trajectory detecting step is stored in advance. And an authentication step for performing authentication by determining whether or not the same trajectory is compared, and providing an authentication method .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 shows an embodiment of an authentication cell according to the present invention. The authentication cell 11 is obtained by, for example, heating and melting a polycarbonate-based colorless and transparent thermoplastic resin and adding the metal flakes 12 to cool and solidify. This size is, for example, about 2 mm square, and the metal flakes are, for example, 25 μm thick and the vertical and horizontal sizes are about 100 μm. The authentication cell is fixedly arranged on, for example, a plastic card.
[0013]
When such an authentication cell 11 is irradiated with light, the light is reflected on the metal flakes 12 arranged in random directions at three-dimensional random positions in the resin, and reflected in various directions as shown in FIG. Generate light. That is, the metal flakes 12 generate reflected light 22 with respect to the incident light 21 from the light source 20. Similarly, the other metal flakes also generate reflected light.
[0014]
Therefore, when the light source 20 is moved to the light source 30 as shown in FIG. 3, the reflection with respect to the incident light 31 becomes reflected light 32. That is, a reflected light locus 34 which is a locus pattern is generated corresponding to the movement locus 33 of the light source. Such a reflected light movement trajectory similarly occurs for other metal flakes. The number, size, position in the authentication cell, and inclination of the metal flakes are determined at random in the manufacturing process of the authentication cell, and are unique to each authentication cell. Correspondingly, the reflected light trajectory of those metal flakes is also a characteristic unique to the authentication cell, which means that replication is extremely difficult.
[0015]
An authentication device and detection system according to an embodiment of the present invention that detects and recognizes a reflected light locus having such characteristics and uses it as identification information unique to an authentication cell will be described below.
[0016]
4A, 4B, and 4C are schematic views of the authentication device and the detection system. First, in a plan view, as shown in FIG. 4A, the light source moves in the light source movement range 41 to shine light on the authentication cell 11 of the authentication device, and the reflected light locus in the detection target reflected light locus range 42. Give rise to Then, for example, a reflected light locus 44 as shown in FIG. 4B is formed with respect to the movement locus 43 of the light source.
[0017]
When this system is viewed from the side, the incident light from the light source 45 to the authentication cell 11 is reflected and received by the reflected light receiver 46 as shown in FIG. Since the light receiving range (reflected light trajectory range 42) of the reflected light receiver 46 is a limited range, a part of the reflected light from the authentication cell 11 is received.
[0018]
The reflected light trajectory information described so far is merely “analog” information, that is, a continuous reflected light trajectory for continuous light irradiation while moving, and digital is easier to handle when used as identification information. Therefore, a method of digitizing the reflected light locus information is considered.
[0019]
FIG. 5 shows an example of digitizing reflected light locus information. In this example, as shown in FIG. 5A, the light source digitally moves on the light source movement locus 52 in the light source movement range 51, stops the light at the designated coordinate position, and then emits light. On the other hand, the light receiver is constituted by a digital light receiving device using a so-called CCD element and receives the reflected light locus 54 as digital data for the reflected light locus range 53 as shown in FIG. 5B. To detect. Of course, the movement of the light source may not be digital, and the reflected light may be acquired by a two-dimensional device.
[0020]
By the way, in order to simplify the description in FIGS. 5A and 5B, only the reflected light trajectory of one metal flake has been described. However, as described above, there are a plurality of metal flakes in the authentication cell. Similarly, since the reflected light locus is generated, it means that the reflected light locus pattern 61 of n pieces of metal pieces that can be received in the reflected light locus range 42 as shown in FIG. 6A can be detected and recognized. Therefore, as shown in FIG. 6B, it can be acquired as data of a three-dimensional matrix in which n two-dimensional coordinate arrays of the digital light receiving device are collected. This is used as the unique identification information of the authentication cell. However, since there may be a large number of reflected light trajectories from the metal flakes, it may be necessary to adjust the reflected light receiving device such as limiting it to a realistic number n by limiting the light intensity at a certain level or more. .
[0021]
FIG. 7 shows a configuration example of a detector in one embodiment of the present invention. The detector 70 includes a control unit 71 that controls the movement and intensity of the light source, the timing of light emission, and the like, a light emitting unit 72 as a light source, a light receiving unit 73 that receives reflected light, and light reception information from the light receiving unit 73. It comprises a reflected light locus analyzing unit 74 for analyzing, a reflected light locus encoding unit 75 for encoding the reflected light locus, and a temporary storage unit 76 for temporarily storing code data, and outputs identification information unique to the authentication device as a unique code. To do.
[0022]
Next, the processing procedure of the detector 70 will be described with reference to the flowchart of FIG. In step S <b> 81, the light emitting unit 72 irradiates the authentication cell with light while stopped at the current position under the control of the control unit 71. In step S <b> 82, the light receiving unit 73 receives reflected light at a timing according to an instruction from the control unit 71. In step S83, the reflected light trajectory analyzing unit 74 performs analysis by mapping the reflected trajectory information from the light receiving unit 73 to a two-dimensional coordinate system and determining coordinate values. In step S84, the reflected light trajectory encoding unit 75 generates a code from the coordinate value data of the reflected light trajectory from the reflected light trajectory analysis unit 74, performs encoding, and temporarily stores the temporary storage unit 76 in a FIFO (first-in first-out) format. Remember. In step S85, it is determined whether or not the current light source position is the final position within the light source movement range (that is, detection end). If it is the final position, the process proceeds to step S86, and if it is not the final position, the process proceeds to step S87.
[0023]
In step S86, all the reflected light trajectory code sequences generated by the reflected light trajectory encoding unit 75 and temporarily stored in the temporary storage unit 76 are output, and the detection process ends.
[0024]
On the other hand, in step S87, the light emitting unit 72 moves the light source to the next light emitting position under the control of the control unit 71 in order to obtain the next reflected light trajectory information. After the movement, the process returns to step S81 to continue the analysis of the trajectory.
[0025]
The reflected light trajectory code string generated by the detector, that is, the identification code unique to the authentication device is a correspondence (relevance) between an authentication medium such as a card in which an authentication cell is incorporated and an object (person or object) holding the authentication medium. It is meaningful only after the attachment is made. For example, when it is used for individual identification such as an ID card for personal identification of a person, a vehicle body manufacturing number of a device such as an automobile, or a device manufacturing number, the correspondence between an identification code unique to the authentication device, an ID number, a manufacturing number, etc. Have to take. That is,
Authentication device unique identification code = individual number (ID number, manufacturing number) = specific person, thing is associated.
[0026]
Assume that this “individual number (ID number, manufacturing number) = specific individual, thing” is left to the user who uses the system, and “authentication device unique identification code = individual number (ID number, manufacturing number)” Is required in the final process of manufacturing the authentication cell.
[0027]
FIG. 9 shows a configuration example of such a system. That is, it comprises an authentication device identification information determination unit 91 that inputs a unique code from the detector 70 and associates it with a series of individual numbers, and an authentication device reflected light pattern database 92 that stores this. The unique code detected by the detector 70 from the authentication device is transferred to the authentication device identification information determination unit 91, and a corresponding individual number is given and stored in the authentication device reflected light pattern database 92. Further, the authentication device identification information determination unit 91 outputs the assigned individual number as the authentication device identification information, and for example, for an ID card, the authentication device identification information determination unit 91 performs association by imprinting the individual number on a card medium. Usually, after an ID card or the like incorporating an authentication cell is manufactured, it is processed by the system and provided together with an authentication device reflected light pattern database 92 in which a correspondence between an authentication device unique identification code and an individual number is recorded.
[0028]
Next, FIG. 10 shows a configuration example of an inspection / determination system for an authentication system according to the present invention. In this system, the code comparison unit 101 searches the authentication device reflected light pattern database 102 for the unique code from the detector 70 to check whether there is a match. The result of the search is notified from the code comparison unit 101 to the determination unit 103, and determines whether or not the authentication device is valid. For example, if the authentication cell is incorporated into an admission permit card or the like, the system can perform a security check as to whether or not the person who owns the card is an authorized person.
[0029]
The system using the optical authentication device described in the above embodiment is effective as an advanced personal / individual authentication system because it is extremely difficult to illegally copy the authentication device.
[0030]
By the way, in the said embodiment, while the light emission part 72 of the detector 70 was moved, the light-receiving part 73 was fixed. On the other hand, a method of fixing the light source and moving the light receiver may be used. As shown in the example of FIG. 11, the reflected light trajectory information is obtained by rotating the reflected light receiver 112 around the authentication cell 113 and the rotation 113 of the tilt of the reflected light receiver 112 interlocked with the rotation 113. Is a set of reflected light trajectories projected onto the curved surface. Therefore, the range of the reflected light trajectory pattern 61 of the single metal flake in FIG. 6 is remarkably increased, and the number of meshes in the two-dimensional coordinate array of the digital light receiving device is also increased, so that a longer code can be generated and illegal copying can be performed more. Has the effect of making it difficult.
[0031]
Alternatively, the light emitting unit 72 and the light receiving unit 73 may be fixed and the authentication cell may be moved. The authentication cell can be rotated, for example, as in the example shown in FIG. The reflected light trajectory information is projected onto the reflected light receiver 122 by the rotation 123 of the authentication cell. Further, for example, as in the example illustrated in FIG. 13, the light source 131 may be fixed and the authentication cell may be moved. The reflected light trajectory information is projected onto the reflected light receiver 132 by the movement 133 of the authentication cell.
[0032]
Furthermore, the methods of the above four embodiments can be combined. That is, a method of moving both the light source and the light receiver, a method of moving both the light source and the authentication cell, or a method of moving the light source, the light receiver, and the authentication cell. However, in this case, since the same pattern is generated depending on the position (angle) of the light source and the light receiver with respect to the authentication cell, it is necessary to remove this. For example, the light is received in the rotation range 116 of the reflected light receiver that does not overlap the rotation range of the light source in FIG. This method can also generate a long code as in the example of the embodiment (photoreceptor moving method).
[0033]
As another application example of this method, for example, when used as the admission permit described above, the photoreceiver is moved every day (the rotation 113 around the authentication cell depending on the day and the reflected light photoreceiver 112 interlocked therewith). It is also possible to recognize a different authentication device unique identification code every day with one authentication device. The authentication system based on this method has an advantage that it is almost impossible to perform fraudulent attempts to cheat the detector, such as obtaining a predetermined reflected light trajectory in advance, baking it on a film, etc., and reflecting it. .
[0034]
In addition, if a method of moving the relative positions of both the light source and the light receiver is used, an ID card incorporating a single authentication cell can be used for various different applications. For example, in the entrance check of a certain building, by setting the position (angle) of the light receiver as θ1 and setting it as θ2 in a place where another individual identification is necessary, different authentication device unique identification codes can be obtained. It is also possible to authenticate independently.
[0035]
In the above embodiment, the light source irradiated to the authentication cell is moved, and the locus pattern by the reflected light from the metal flakes built in the authentication cell is examined. However, in the present invention, the reflection pattern of light from the small piece having metallic luster in the authentication cell may be examined without moving the irradiation light. Further, in the present invention, the small piece having metallic luster that is fixedly disposed in the authentication cell may have a surface that can reflect at least one light, and may not be a thin piece.
[0036]
By the way, the resin having optical transparency used in the present invention is not only thermoplastic resin such as polycarbonate resin, but also thermosetting resin such as epoxy resin, glass or optical fiber material, DVD, CD or CD-R. A surface coating material or the like can be used, so long as it has a property of transmitting light.
[0037]
As for the small piece having metallic luster, it is preferable that the piece does not have deflection, so that the surface of the glass plate subjected to metal plating is more preferable, but mica or the like can also be used. In short, as long as it reflects light like metal, it can be used as a small piece having metallic luster of the present invention.
[0038]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain an authentication system, an authentication method, and the like that cannot be imitated by others and have a very high security level.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining an example of the structure of an optical device according to an embodiment of the invention.
FIG. 2 is a diagram for explaining an example of optical reflection of an authentication cell in an embodiment of the present invention.
FIG. 3 is a diagram for explaining an example of optical reflection of an authentication cell in an embodiment of the present invention.
FIG. 4 is a diagram for explaining an outline of a reflection trajectory detector using an authentication cell according to an embodiment of the present invention.
FIG. 5 is a diagram for explaining an example of a reflection locus detection method using an authentication cell according to an embodiment of the present invention.
FIG. 6 is a diagram for explaining an example of a reflection locus detection method using an authentication cell according to an embodiment of the present invention.
FIG. 7 is a diagram for explaining a configuration example of a detector according to an embodiment of the present invention.
FIG. 8 is a flowchart for explaining the operation of the detector according to the embodiment of the present invention.
FIG. 9 is a diagram for explaining a configuration example of an authentication system using an authentication device according to an embodiment of the present invention.
FIG. 10 is a diagram for explaining a configuration example of an authentication system using an authentication device according to an embodiment of the present invention.
FIG. 11 is a diagram for explaining another embodiment of the present invention.
FIG. 12 is a diagram for explaining another embodiment of the present invention.
FIG. 13 is a diagram for explaining another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Authentication cell, 12 ... Metal flake, 20, 45, 111, 121, 131 ... Light source, 21 ... Incident light, 22 ... Reflected light, 33, 43, 53 ... Light source movement locus, 34, 44 ... reflected light locus, 41 ... light source movement range, 42 ... reflected light locus range to be detected, 46, 112, 122, 132 ... reflected light receiver, 70 ... Detector, 71 ... Control unit, 72 ... Light emitting unit, 73 ... Light receiving unit, 74 ... Reflected light locus analyzing unit, 75 ... Reflected light locus encoding unit, 76 ... temporary code storage unit, 91 ... authentication device identification information determination unit, 92, 102 ... authentication device reflected light pattern database, 101 ... code comparison unit, 103 ... determination unit.

Claims (2)

A light irradiating means for irradiating the authentication cell comprising a small piece with a metallic luster which is arranged in a random orientation have a distributed planar portion to the resin in the resin having optical transparency, a light,
Angle changing means for relatively changing the angle of the light irradiated by the light irradiating means entering the authentication cell ;
A reflected light trajectory detecting means for detecting a two-dimensional reflection trajectory of the light reflected by the small piece when the angle at which the light is incident on the authentication cell is continuously changed by the angle changing means ;
Authenticating means for performing authentication by comparing the locus of the reflected light detected by the reflected light locus detecting means with a locus stored in advance and determining whether or not they are the same locus;
An authentication system comprising: A light irradiating step of irradiating the authentication cell comprising a small piece with a metallic luster which is arranged in a random orientation have a distributed planar portion to the resin in the resin having optical transparency, a light,
An angle changing step of relatively changing an angle of the light irradiated by the light irradiation step incident on the authentication cell ;
A reflected light locus detecting step for detecting a two-dimensional reflected locus of the light reflected by the small piece when the angle at which the light is incident on the authentication cell is continuously changed by the angle changing step;
An authentication step for performing authentication by comparing the trajectory of the reflected light detected by the reflected light trajectory detection step with a trajectory stored in advance and determining whether or not the same trajectory;
An authentication method comprising the steps of:

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