JP5023992B2 - Counterfeit discrimination system and counterfeit discrimination device - Google Patents

Description

  The present invention relates to a forgery determination system for determining counterfeit bills.

  In order to provide anti-counterfeit paper with individual information having a high anti-counterfeit effect, anti-counterfeit paper has been proposed in which individual information is given by randomly assigning a material that can be authenticated by machine reading. (For example, refer to Patent Document 1). Further, in order to prevent forgery of a certificate or the like without imposing a burden on an issuer or the like, there has been proposed a composite apparatus that performs a printing operation and a scanning operation on a sheet without discharging the sheet (for example, Patent Document 2). reference).

JP 2000-265397 A JP 2005-151466 A

By the way, discrimination of counterfeit in banknotes is performed, for example, by transmitting the feature data of the paper read by the counterfeit discrimination device to a server in which the feature data of the paper is already stored, and the feature data stored in this server And the transmitted feature data can be compared. However, for example, when the forgery determination target is issued in large quantities like a banknote, the amount of information stored in the server increases, resulting in inconveniences such as longer access time. As a result, the processing time for forgery determination also increases.
An object of the present invention is to provide a system or the like that can perform counterfeit discrimination in banknotes in a shorter time.

According to the first aspect of the present invention, the encrypted information obtained by encrypting a part of the characteristics of the medium and the encrypted information obtained by encrypting the position information about the position of the part of the medium are stored in the medium. A printing device that prints and issues banknotes, and a discrimination device that discriminates the possibility of counterfeiting of the banknotes, and the discrimination device is acquired from the banknotes issued by the printing device. a decoding means for decoding the encrypted information, based on information obtained by the decoding by the decoding unit, a first monitor which monitors the features of the part of the medium, the decoding The position information acquisition means for acquiring the position information from the information obtained by the decoding by the conversion means, and the characteristics of the part existing in the position specified by the position information acquired by the position information acquisition means of the medium A second monitor which monitors a comparison means for comparing the feature that is grasped by the first said characteristic which is grasped by the grasping means and the second gripping means, from said comparison result by said comparing means A counterfeit discrimination system including discrimination means for discriminating the possibility of counterfeiting of banknotes.
According to a second aspect of the present invention, in the medium on which the printing apparatus prints the encrypted information, a design is printed on the medium, and the characteristic of the part of the medium on which the encryption is performed is recorded on the medium. The counterfeit discrimination system according to claim 1, wherein the symbol is acquired from the medium after the symbol is printed .
The invention according to claim 3 further includes a determining unit that determines the position of the part of the medium to be encrypted, and a random number information generating unit that generates random number information, and the determining unit includes: 3. The forgery determination system according to claim 1, wherein the position of the part to be encrypted is determined based on random number information generated by the random number information generation unit .
According to a fourth aspect of the present invention, the printing apparatus includes: a conveying unit that conveys the medium; a characteristic grasping unit that grasps the partial feature from the medium conveyed by the conveying unit; and the feature grasping unit And encrypting means for encrypting the part of the features grasped by the medium, and the medium disposed downstream of the feature grasping means in the medium conveying direction by the conveying means and the medium conveyed by the conveying means. And a forming unit that forms the image on the medium as the image with the partial feature encrypted by the encryption unit, and the forming unit is formed on the medium transported by the transport unit. The pattern is formed, and the image of the part of the characteristic is formed on the upstream side of the pattern formation position in the conveyance direction of the medium by the conveyance unit. That is a forgery determination system according to any one of claims 1 to 3.
The invention according to claim 5 further includes a server connected to the discrimination device via a network and storing a decryption key used for decrypting the encrypted information, wherein the decryption means in the discrimination device comprises: 2. The forgery determination system according to claim 1, wherein the decryption is performed using a decryption key acquired from the server .
The invention according to claim 6 is the forgery determination system according to claim 1 , wherein the printing apparatus prints the encrypted information on the medium as a barcode .

According to a seventh aspect of the present invention, an encryption key used for generating the encryption information and a decryption key used by the decryption means for the decryption are generated in a relation of an asymmetric key pair. The forgery discrimination system according to claim 1 .
The invention according to claim 8 is the forgery determination system according to claim 1 , wherein the encryption key used for generating the encryption information is a secret key .
The invention according to claim 9 is printed with the encrypted information obtained by encrypting a part of the characteristics of the medium and the encrypted information obtained by encrypting the position information about the position of the part of the medium. Based on the information obtained by the obtaining means for obtaining the encrypted information from the medium, the decrypting means for decrypting the encrypted information obtained by the obtaining means, and the decryption by the decrypting means, First grasping means for grasping the characteristics of the part of the medium; position information obtaining means for obtaining the position information from information obtained by decoding by the decoding means; and the position information of the medium A second grasping means for grasping a feature of a part existing at a position specified by the position information obtained by the obtaining means; the feature grasped by the first grasping means; and the second grasping means. Comparing means for comparing the features that are grasped, a forgery distinction unit comprising a determining means for determining the likelihood of forgery in the medium from the comparison result by the comparison means.
According to a tenth aspect of the present invention, there is provided identification information acquisition means for acquiring, from the medium, identification information provided to the medium for identifying the medium from another medium, and the identification acquired by the identification information acquisition means. Transmitting means for transmitting information to a server provided outside via a network; and a decryption key stored in the server in association with the identification information and used for decryption by the decryption means from the server to the network. The counterfeit discrimination device according to claim 9, further comprising receiving means for receiving via the counter.

According to the first aspect of the present invention, it is possible to provide a forgery discrimination system capable of discriminating forgery in banknotes in a shorter time compared to the case where this configuration is not provided.
According to the fifth aspect of the present invention, it is possible to obtain the decryption key more easily than when the decryption key is distributed using a medium such as a CD-ROM.
According to the sixth aspect of the present invention, for example, the encrypted information can be acquired using a general-purpose sensor, and the forgery determination system can be configured at a lower cost.
According to the seventh aspect of the present invention, for example, it is possible to make it difficult for a malicious third party to grasp the encryption key.
According to the invention described in claim 8 , counterfeiting of banknotes by a malicious third party can be made more difficult.

According to the ninth aspect of the present invention, it is possible to provide a forgery discrimination device capable of discriminating forgery in banknotes in a shorter time compared to the case where this configuration is not provided.
According to the tenth aspect of the present invention, it is possible to obtain the decryption key more easily than when the decryption key is distributed using a medium such as a CD-ROM.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram illustrating a forgery determination system according to the present embodiment.
The counterfeit discrimination system shown in the figure is a printing device 10 that prints (issues) banknotes, a plurality of counterfeit discrimination devices (discriminator) 50 that discriminate the possibility of counterfeit bills, and is used for management of this system. A personal computer (PC) 70, a server 80 that stores information and performs predetermined processing, and a backup server 90 that backs up the server 80 are schematically configured. Note that these devices and the like are connected to a network 100 such as the Internet via relay devices such as routers 10a, 50a, 80a, and 90a. Here, the backup server 90 is installed at a location geographically distant from the server 80 in preparation for destruction such as an accident or terrorism. Moreover, although this embodiment demonstrates a banknote as an example, this counterfeit discrimination | determination system can be applied also to printed matter with possibility of forgery, such as securities, a certificate, and a ticket. That is, the banknotes include printed matter that may be counterfeited such as securities, certificates, and tickets in addition to banknotes.

Here, FIG. 2 is a block diagram illustrating functional configurations of the printing apparatus 10, the forgery determination apparatus 50, and the server 80.
As shown in the figure, a printing apparatus 10 according to the present embodiment includes a communication unit 11 that performs data communication via a network 100, a processing unit 12 that executes various processes based on a predetermined program, and a sheet provided for bills. The image data acquisition unit 13 for reading the surface of the image and acquiring the image data, the image information storage unit 14 for storing image information such as the pattern of the banknote, and the serial number assigned to each image or banknote based on the image information A printing unit 15 that prints (forms) a sheet as an example of a medium is provided.

  Here, the communication unit 11 is realized by, for example, a CPU (Central Processing Unit) (not shown), a main memory, a communication I / F, and the like provided in the printing apparatus 10. The processing unit 12 is realized by a CPU, a main memory, a magnetic disk device, etc. (not shown). Further, the image data acquisition unit 13 is realized by, for example, a CPU, a main memory, and a sensor 45 described later, and the image information storage unit 14 is realized by, for example, a magnetic disk device. Further, the printing unit 15 is realized by a CPU, a toner image forming unit 20 described later, a fixing device 40, and the like.

  The forgery discriminating device 50 discriminates (determines) whether or not the bill is forged by being installed in various stores. The counterfeit discrimination device 50 can be incorporated into a POS system (register) in a supermarket or the like, an ATM (automatic teller machine) installed in a vending machine, a bank, or the like. Here, the forgery determination device 50 has, as functional configurations, a communication unit 51 that performs data communication via the network 100, a processing unit 52 that executes various processes based on a predetermined program, and a bill surface by reading the bill surface. Information acquisition unit 53 for acquiring the barcode information attached to the serial number and the serial number attached to the banknote, the image data acquisition unit 54 for acquiring the image data by reading the surface of the banknote, and the operator of the counterfeit discrimination device 50 And a notification unit 55 for notifying the user of information.

  Here, the communication unit 51 is realized by a CPU, main memory, communication I / F, and the like (not shown) provided in the forgery determination device 50, and the processing unit 52 is realized by a CPU, main memory, a magnetic disk device, and the like. The The information acquisition unit 53 is realized by, for example, a CPU or a CCD camera 63 (see FIG. 10) described later. The image data acquisition unit 54 is realized by a CPU, a main memory, a sensor 64 (see FIG. 10) described later, and the like. The notification unit 55 can be realized by, for example, a display display (not shown) or a speaker.

  On the other hand, the server 80 is realized by a workstation, a personal computer, or other computer devices. The server 80 includes a communication unit 81 that performs data communication via the network 100 and a processing unit 82 that executes various processes based on a predetermined program. The server 80 also includes a serial number DB (database) 83 that stores the composite key and the serial number attached to the banknote in a state of being associated with each other. Here, the communication unit 81 is realized by a CPU (not shown), a main memory, a communication I / F, and the like provided in the server 80, and the processing unit 82 is realized by a CPU, a main memory, a magnetic disk device, and the like. The serial number DB 83 is realized by, for example, a magnetic disk device.

Here, FIG. 3 is an explanatory view showing an embodiment of the printing apparatus 10. FIG. 4 is a diagram for explaining a sensor 45 provided in the printing apparatus 10.
As illustrated in FIG. 3, the printing apparatus 10 according to the present embodiment prints (prints) a banknote image (design), a serial number, and a two-dimensional barcode on paper P using an electrophotographic method. For this reason, the printing apparatus 10 according to the present embodiment includes a toner image forming unit 20 that forms a toner image on the paper P, a paper transport system 30 that transports the paper P, and the toner image forming unit 20 on the paper P. A fixing device 40 for fixing the toner image formed on the paper P to the paper P is provided. Further, the printing apparatus 10 includes a sensor 45 that reads the paper P and acquires image data.

  The toner image forming unit 20 is rotatably provided and holds a toner image, a charging device 22 that charges the photosensitive drum 21, and the photosensitive drum 21 is scanned and exposed with a laser beam to expose the photosensitive member. An exposure device 23 that forms an electrostatic latent image on the drum 21 and a developing device 24 that develops the electrostatic latent image formed on the photosensitive drum 21 by the exposure device 23 are provided. In addition, the toner image forming unit 20 is disposed at a position facing the photoconductive drum 21 and is formed on a transfer roll 25 that forms a transfer unit on which the toner image held by the photoconductive drum 21 is transferred to the paper P. And a cleaning device 26 for removing toner remaining on the photosensitive drum 21 after the toner image is transferred.

The paper transport system 30 separates the paper stacking unit 31 that stacks the paper P, the nudger roll 32 that picks up and feeds the paper P from the paper stacking unit 31, and the paper P supplied from the nudger roll 32 one by one. And a plurality of pairs of transport rolls 34 for transporting the paper P separated one by one by the paper feed roll 33 toward the transfer unit.
The fixing device 40 includes a fixing roll 41 that is rotatably arranged, a pressure roll 42 that is press-fitted to the fixing roll 41, and a heating source such as a halogen heater that heats the fixing roll 41 and the pressure roll 42 ( The toner image is fixed on the sheet P by applying heat and pressure to the conveyed sheet P.

  The sensor 45 is disposed on the upstream side of the toner image forming unit 20 in the paper conveyance direction, and reads the paper P and prints image data before printing on the paper P (before the toner image is transferred). get. For example, as shown in FIG. 4A, the sensor 45 is a line sensor (CCD image sensor) in which a plurality of photodiodes (not shown) are arranged in the main scanning direction (a direction orthogonal to the conveyance direction of the paper P). Can be configured. Further, as shown in FIG. 5B, the sensor 45 can be arranged such that a reflective or transmissive optical sensor can be moved in a direction orthogonal to the paper transport direction. The sensor 45 can also be moved along the paper transport direction.

  Here, in this embodiment, the case where the toner image forming unit 20 is single has been described. However, a so-called tandem type arrangement in which a plurality of toner image forming units 20 are arranged in parallel may be used. Specifically, for example, four toner image forming units 20 that form yellow, magenta, cyan, and black toner images on the respective photosensitive drums may be arranged. Further, an intermediate transfer belt on which a superimposed toner image in which toner images of yellow, magenta, cyan, and black are superimposed is formed, and the superimposed toner image formed on the intermediate transfer belt can be transferred to the paper P. .

  In addition, the printing apparatus 10 includes a CPU, a main memory, and a magnetic disk device (HDD: Hard Disk Drive) (not shown). Here, the CPU executes various software such as an OS (Operating System) and applications. The main memory is a storage area for storing various software and data used for execution thereof, and the magnetic disk device is a storage area for storing input data for various software, output data from various software, and the like. Furthermore, the printing apparatus 10 includes a communication I / F for performing communication with the outside.

Here, the paper P will be described in detail.
FIG. 5 is a diagram for explaining the paper P. FIG. Here, FIG. 5A shows the state of the paper P after the toner image is formed by the toner image forming unit 20 and fixed by the fixing device 40. FIG. 5B shows the state of the paper P before the toner image is formed by the toner image forming unit 20. In FIG. 5A, illustration of a metal film K (described later) shown in FIG. 5B is omitted.

  As shown in FIG. 5B, the metal film K is randomly dispersed on the paper P used in the present embodiment. The dispersion of the metal film K can be performed by mixing the metal film K during papermaking. In the present embodiment, the metal film K is taken as an example. However, for example, a material that emits light by irradiation with ultraviolet rays can be used. Further, as shown in Japanese Patent Application Laid-Open No. 2000-265397 and the like, the paper P can be formed by other methods. Further, the paper P in this embodiment is provided with two reference marks B having a cross in a circle. The reference mark B is printed after the paper is formed and the paper P is formed. This printing can be performed by the printing apparatus 10 or by another apparatus or the like.

When a toner image is formed on the paper P shown in FIG. 5B by the toner image forming unit 20 and fixing processing is performed by the fixing device 40, the state shown in FIG. To do.
The banknote S in the present embodiment has a symbol S1, a serial number S2, and a two-dimensional barcode S3 including information such as the amount of money on the surface (on the paper P). In the present embodiment, when the toner image is formed on the paper P in the toner image forming unit 20, the toner image of the two-dimensional barcode S3 is formed after the toner image of the symbol S1 and the serial number S2 is formed. Is formed.

  That is, in the drawing, the left side of the paper P reaches the toner image forming unit 20 first, and a toner image having the design S1 and the serial number S2 is formed. Thereafter, the right side of the paper P reaches the toner image forming unit 20, and a toner image of the two-dimensional barcode S3 is formed. As described above, in this embodiment, after the toner image having the symbol S1 and the serial number S2 is formed, the toner image having the two-dimensional barcode S3 is formed. In such an order, even if the distance from the sensor 45 to the transfer portion in the toner image forming portion 20 is shorter than the length of the paper P (the length in the transport direction), it is based on the image data read by the sensor 45. The two-dimensional barcode S3 can be printed on the paper P.

Here, a process when a new banknote is issued by the printing apparatus 10 will be described. FIG. 6 is a flowchart showing processing executed by the printing apparatus 10.
In the printing apparatus 10, first, the paper P that is the basis of the banknote is transported by the paper transport system 30. When the paper P is transported, the image data acquisition unit 13 reads the surface of the paper P and acquires image data (step 101). Next, the processing unit 12 encodes (numerizes) the image data at a predetermined position (predetermined region) in the acquired image data (step 102). In other words, the processing unit 12 encodes part of the acquired image data. As described above, in the present embodiment, the image data is encoded and the encryption described later is performed. For this reason, in step 101, image data is acquired at a resolution that allows encoding and encryption.

  Here, FIGS. 7 and 8 are diagrams for explaining step 101 and step 102 described above. In step 101, as described above, the image data acquisition unit 13 reads the surface of the paper P and acquires image data. For example, when the left portion of the paper P is in the state shown in FIG. 7A, the image data acquisition unit 13 acquires image data as shown in FIG. Next, at step 102, as described above, the processing unit 12 encodes image data at a predetermined position (part) of the acquired image data. Here, for example, as shown in FIGS. 2B and 2C, the processing unit 12 encodes the fourth (fourth line) and the twenty-first (21st line) image data from the reference mark B located below. To do.

  In the above description, an example in which image data is encoded in units of lines has been described. However, image data can also be encoded in units of predetermined blocks (areas). Furthermore, all the acquired image data can be encoded. Furthermore, the processing unit 12 can also encode a plurality of image data in different regions (positions). Further, a random number generation unit (not shown) can be provided, and the position of image data to be encoded can be determined based on the random number generated by the random number generation unit. The random number generation unit can be provided in the printing apparatus 10, or can be provided in the server 80 to transmit random number information from the server 80 to the printing apparatus 10. In addition, the image data may include noise or the like. For this reason, as shown in FIG. 8, data having a width smaller than a predetermined threshold (see FIG. 8A) can be deleted, and the data shown in FIG. 8B can be encoded.

Here, returning to FIG. 6, the processing in the printing apparatus 10 will be further described.
After the processing in step 102 is completed, the processing unit 12 generates a key pair (encryption key, decryption key) that has a relationship with the asymmetric encryption (asymmetric key encryption, asymmetric key pair) (step 103). Thereafter, the processing unit 12 encrypts the image data encoded in step 102 and the position information indicating the position of the encoded image data using the encryption key (step 104). Here, the processing unit 12 can erase the encryption key immediately after performing encryption. Thereafter, the processing unit 12 generates a two-dimensional barcode from the encrypted information encrypted in Step 104 (Step 105). Next, the printing unit 15 prints the two-dimensional barcode, banknote design, and serial number generated in Step 105 on the paper P (Step 106). The printing unit 15 acquires the banknote symbol by referring to the image information storage unit 14.

Thereafter, the communication unit 11 transmits the serial number given to the paper P in step 106 and the decryption key generated in step 103 to the server 80 (step 107), and the process is terminated. Here, when the server 80 receives the serial number and the composite key from the printing apparatus 10, the server 80 stores them in the serial number etc. DB 83 in a state in which they are associated with each other.
When the above process is completed, as shown in FIG. 5A, the banknote S including the symbol S1, the serial number S2, and the two-dimensional barcode S3 is completed. The communication between the printing apparatus 10 and the server 80 and the communication (described later) between the forgery determination apparatus 50 and the server 80 can be performed by encrypted communication. In addition, it is possible to determine whether a device to be communicated is a correct device by using a known electronic certification mechanism.

Here, FIG. 9 is a diagram for explaining Step 104 to Step 106 described above. The steps 104 to 106 will be specifically described with reference to FIG.
In step 104, as described above, the encoded image data and the position information indicating the position of the encoded image data are encrypted using the encryption key. Specifically, as shown in FIGS. 9A and 9C, the position information and the encoded image data are encrypted using the encryption key. In performing the encryption, as shown in FIG. 4B, the binary image data or the like can be converted into a hexadecimal number, and the hexadecimal image data can be encrypted.

In steps 105 to 106, a two-dimensional bar code is generated from the encrypted position information and image data as shown in FIGS. Print.
In the above example, binary image data and the like are converted into hexadecimal numbers. However, for example, information may be compressed by counting and arranging 0 and 1 numbers. For example, when the encoded image data is “000001110000000000001110000000001110000111110000”, it can be “53C393454”.

  Here, in this embodiment, the example in which the encrypted information is printed as a two-dimensional barcode has been described, but it is also possible to print the information as a one-dimensional barcode, a character, a symbol, or the like. Further, in the present embodiment, the aspect in which image data is acquired by the image data acquisition unit 13 before the design of the banknote is printed by the printing unit 15 has been described. In addition to this aspect, for example, after a design of a banknote is printed, image data can be acquired by the image data acquisition unit 13 and a two-dimensional barcode can be printed on the paper P based on this image data.

  In this embodiment, the encryption key, the decryption key, and the serial number are generated on the printing apparatus 10 side. However, the server 80 may generate the encryption key, the decryption key, and the serial number. it can. In this case, the encryption key and serial number are transmitted from the server 80 to the printing apparatus 10. Furthermore, the encryption key and the decryption key can be generated in advance or can be newly generated every time printing on the paper P is performed.

Here, FIG. 10 is a diagram illustrating an embodiment of the forgery determination device 50.
As shown in the figure, the counterfeit discrimination device 50 according to the present embodiment includes a platen glass 61 on which a bill S is placed, a pressing plate 62 for pressing the bill S placed on the platen glass 61, and a two-dimensional bar printed on the bill S. A CCD camera 63 that reads the code S3 (see FIG. 5A) and the serial number S2 and a sensor 64 that reads the paper P and acquires image data are provided. Here, the CCD camera 63 is an example and can be configured by other existing technologies. The sensor 64 is provided so as to be movable along the platen glass 61 (see the arrow in the figure). Further, the sensor 64 can be configured in the same manner as the sensor 45 provided in the printing apparatus 10.

Next, processing in the forgery determination device 50 will be described.
Here, FIG. 11 is a flowchart showing processing executed by the forgery determination device 50, and FIG. 12 is a diagram for explaining predetermined processing executed by the forgery determination device 50.

  As shown in FIG. 11, in the forgery discrimination device 50, first, the image data acquisition unit 54 reads the banknote surface to acquire image data, and holds the acquired image data (step 201). Next, the information acquisition unit 53 that functions as an acquisition unit and an identification information acquisition unit reads an example of the identification information by reading the two-dimensional barcode S3 (see FIG. 5A) and the serial number S2 on the surface of the banknote S. The serial number and barcode information (encrypted information) are acquired (step 202). Here, the barcode information acquired by the information acquisition unit 53 is obtained by encoding a two-dimensional barcode S3 as an image, as shown in FIGS.

  Thereafter, the communication unit 51 functioning as a transmission unit transmits the acquired serial number to the server 80 (step 203). Here, when receiving the serial number, the processing unit 82 in the server 80 searches the serial number DB 83 and identifies the decryption key stored in association with the serial number. Then, the specified decryption key is transmitted to the forgery determination device 50 via the communication unit 81. Accordingly, the communication unit 51 functioning as a receiving unit of the forgery determination device 50 receives the composite key from the server 80 (step 204).

After that, the processing unit 52 functioning as the first grasping means decrypts the barcode information using the decryption key received in step 204, and obtains image data (first feature) (hereinafter referred to as “the first feature”). (Referred to as "one image data") and position information indicating the position where the first image data is acquired (step 205). Here, when a description is added with reference to FIG. 12, the processing unit 52 combines the barcode information and obtains the image data and the position information as shown in FIGS. However, since the decoded image data and position information are hexadecimal numbers, in this embodiment, binarization is performed as shown in (c) and (d) of FIG. Data (first image data) and position information are used.
Next, the processing unit 52 functioning as the second grasping unit acquires the image data at the position specified by the position information acquired at Step 205 from the image data held at Step 201 and stores the image data. Encoding is performed (step 206), and encoded image data (second feature) (hereinafter referred to as “second image data”) is acquired (understood) (step 207).

  Thereafter, the processing unit 52 functioning as a comparison unit and a discrimination unit compares the first image data acquired in step 205 with the second image data acquired in step 207, and the first image data and the second image data are compared. Is approximated (step 208), and the possibility of forgery is determined. Here, the determination as to whether or not the image data is approximate can be made using various existing techniques that have been conventionally proposed. Note that, for example, the difference between the image density information at the same position is totaled, and if the total value is equal to or less than a predetermined value, it can be determined that the approximation is made.

  When the processing unit 52 determines that the first image data and the second image data are close to each other, for example, it is highly likely that the processing unit 52 is a genuine bill (forged bill). The user is notified (the possibility is low) (step 209), and the process ends. On the other hand, when it is determined that the first image data and the second image data are not approximate, for example, it is notified that there is a high possibility that the first image data and the second image data are counterfeit bills (step 210), and the process ends.

  Note that the encryption key used in the present embodiment is not disclosed but kept secret. That is, the encryption key is a secret key. For this reason, it becomes difficult for a malicious third party to create a counterfeit bill having a two-dimensional barcode appropriately encrypted. In addition, for example, when a malicious third party steals the paper P and attaches a serial number or a two-dimensional barcode attached to another banknote to the paper P by copying, the first And the second image data do not match. For this reason, in this embodiment, even if the base paper P is stolen, it can be found that it is a counterfeit bill.

Further, in the present embodiment, the image data (feature information) indicating the characteristics of the paper is not stored in the server 80 or the like, but is encrypted and attached only to the paper P. For this reason, image data (feature information) is prevented from being stolen (replicated) and leaked to others.
Furthermore, in this embodiment, an asymmetric key cryptosystem is adopted. For this reason, the decryption key can be transmitted using an open network such as the Internet. In this case, even if the decryption key is stolen by a malicious third party, the decryption key cannot be used for proper encryption. For this reason, even if the decryption key is stolen, it is difficult to create a forged bill that passes through the forged discrimination device 50.

  Note that the forgery determination device 50 may be provided independently of the network 100. In this case, the serial number and the composite key can be distributed by CD-ROM (Compact Disk Read Only Memory) and DVD-ROM (Digital Versatile Disk Read Only Memory) without going through the network 100. In this case, even if the CD-ROM or the like is stolen, the encryption key is not stolen. For this reason, also in this case, it is difficult to create a counterfeit bill that passes through the counterfeit discrimination device 50.

In the present embodiment, the image data read by the printing apparatus 10 is not transmitted to the server 80 but is encoded and encrypted and printed on the paper P.
Incidentally, the image data read by the printing apparatus 10 can be stored in the server 80 together with the serial number. When the authenticity determination of the banknote is performed, for example, the image data and serial number read by the forgery determination device 50 are transmitted to the server 80. The server 80 can also perform image data matching to determine forgery (authenticity) of banknotes. However, in this case, a large amount of image data is stored in the server 80, which may increase the access time and processing time.

  In particular, in the case of a large number of issued items such as banknotes, it takes a very long time to perform matching, and the access time and processing time become extremely long. In addition, the amount of data at the time of communication becomes large, and there is a possibility that forgery determination itself cannot be performed in an area where the communication situation is not good. Compared to this, in the case of the present embodiment, it is only necessary to transmit and receive the serial number and key information (decryption key), so that communication data can be suppressed. For this reason, it is possible to perform forgery determination processing in a short time.

It is a schematic structure figure showing a forgery discrimination system concerning this embodiment. It is the block diagram which showed the function structure of the printing apparatus, the forgery discrimination apparatus, and the server. It is explanatory drawing which showed one Embodiment of the printing apparatus. It is a figure for demonstrating the sensor provided in a printing apparatus. It is a figure for demonstrating a paper. 6 is a flowchart illustrating processing executed by the printing apparatus. It is a figure for demonstrating step 101 and step 102. FIG. It is a figure for demonstrating step 101 and step 102. FIG. It is a figure for demonstrating step 104-step 106. FIG. It is the figure which showed one Embodiment of the forgery discrimination apparatus. It is a flowchart which shows the process performed with a forgery discrimination apparatus. It is a figure for demonstrating the predetermined | prescribed process performed with a forgery discrimination apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Printing apparatus 50 ... Forgery discrimination apparatus 51 ... Communication part 52 ... Processing part 53 ... Information acquisition part 80 ... Server, P ... Paper

Claims (10)

Encrypted information in which some features of the medium are encrypted, and encrypted information in which position information about the position in the part of the medium is encrypted are printed on the medium, and banknotes are issued. A printing device to perform,
A discriminator for discriminating the possibility of counterfeiting of the banknotes,
The discrimination device is:
Decryption means for decrypting the encrypted information acquired from the banknotes issued by the printing device ;
First grasping means for grasping the characteristics of the part of the medium based on information obtained by decryption by the decryption means;
Position information acquisition means for acquiring the position information from information obtained by decoding by the decoding means;
A second grasping means for grasping a feature of a part existing in the position specified by the position information obtained by the position information obtaining means among the medium ;
Comparing means for comparing the feature grasped by the first grasping means with the feature grasped by the second grasping means;
A counterfeit discrimination system comprising: discrimination means for discriminating the possibility of counterfeiting of the banknotes from the comparison result by the comparison means. A pattern is printed on the medium on which the printing apparatus prints the encrypted information,
The forgery determination system according to claim 1, wherein the characteristic of the part of the medium to be encrypted is acquired from the medium after the design is printed on the medium. Determining means for determining the position of the part of the medium to be encrypted;
A random number information generation unit for generating random number information;
Further comprising
The forgery determination system according to claim 1 or 2, wherein the determination unit determines the position of the part to be encrypted based on the random number information generated by the random number information generation unit. The printing apparatus includes:
Conveying means for conveying the medium;
Feature grasping means for grasping the partial feature from the medium transported by the transporting means;
An encryption means for encrypting the part of the features grasped by the feature grasping means;
The part arranged downstream of the feature grasping means in the medium conveying direction by the conveying means, forms a pattern on the medium conveyed by the conveying means, and is encrypted by the encrypting means A forming part for forming the characteristic of the image on the medium as an image;
With
The forming unit forms the symbol on the medium conveyed by the conveying unit, and the upstream of the symbol forming position in the conveyance direction of the medium by the conveying unit. The forgery discrimination system according to claim 1, wherein an image is formed. A server that is connected to the determination device via a network and stores a decryption key used to decrypt the encrypted information;
2. The forgery discrimination system according to claim 1, wherein the decryption means in the discrimination device performs the decryption by using a decryption key acquired from the server.   The forgery determination system according to claim 1, wherein the printing apparatus prints the encrypted information on the medium as a barcode. The encryption key used for generating the encryption information and the decryption key used by the decryption means for the decryption are generated in a relation of an asymmetric key pair. Forgery discrimination system.   2. The forgery determination system according to claim 1, wherein an encryption key used for generating the encryption information is a secret key. Acquiring encryption information in which a part of the feature is encrypted media, and the encrypted information from the medium in which position information encrypted information encrypted is printed on the position of the part of the medium Acquisition means to
Decryption means for decrypting the encrypted information acquired by the acquisition means ;
First grasping means for grasping the characteristics of the part of the medium based on information obtained by decryption by the decryption means;
Position information acquisition means for acquiring the position information from information obtained by decoding by the decoding means;
A second grasping means for grasping a feature of a part existing in the position specified by the position information obtained by the position information obtaining means among the medium ;
Comparing means for comparing the feature grasped by the first grasping means with the feature grasped by the second grasping means;
A counterfeit discrimination device including discrimination means for discriminating the possibility of forgery in the medium from a comparison result by the comparison means. Identification information acquisition means for acquiring, from the medium, identification information assigned to the medium for identifying the medium from other medium;
Transmitting means for transmitting the identification information acquired by the identification information acquiring means to a server provided outside via a network;
Claim 9, characterized in that said stored associated with the identification information to the server further comprises a receiving means for receiving via the network from the server decryption key used for decryption the decryption means The forgery discrimination device described.

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