KR101535534B1 - A Creating and Verifying Method Of A Document Having Printed Means Of Preventing From Forging/Manipulating - Google Patents

Abstract

The present invention relates to a document having a forgery prevention means using a print steganography method, a method for creating the document thereof, and a method for verifying a forgery for the document thereof. The document of the present invention comprises printed document information and a forgery prevention means, wherein the forgery prevention means includes a two-dimensional code having a data area, and a plurality of halftones. In addition, the data area of the two-dimensional code includes a first data area having the document information coded therein, and includes a second data area in which the document information and encoding data of the halftones have a hash value created and coded by a hash algorithm.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for generating a document including counterfeiting prevention means using a printer steganography technique and a method for confirming forgery of the document.

The present invention relates to a method of generating a document including forgery prevention means using a printer steganography technique and a method for confirming forgery of the document, and more particularly, to a method and apparatus for preventing forgery and falsification of a document, The present invention relates to a method of generating a document provided with a forgery prevention means using a graphic method, and a method for confirming forgery of the document.

As shown in Fig. 1, the document includes the issuing organization 12, the destination 13, the issuing date 15, the title, and the contents 17 of the document, and the seal of the issuing agency is stamped 19 ), And document number (12) is described.

As shown in FIG. 2, in the securities such as money, checks, and bills, which are generally used, an issuing institution such as a bank, an amount and an occurrence date are described, and a stamp of the generating agency is stamped.

The document printed by the color printer, including the securities shown in FIG. 2, is printed with a unique mark of the printing apparatus manufacturer so as to indicate the serial number or the print date. Unique mark is printed, the pattern is repeated as a plurality of fine dots and is printed in a pale yellow to hard group are identified with the naked eye. This is called steganography. Examples are light yellow (RGB: # F5F0C5, CMYK: 4,2,27,0) or light color (RGB: # F8E77F, CMYK: 4,4,62,0) in light yellow. For reference, the black RGB code and the CMYK code are # 1D1E23 and "93, 89, 83, 52", respectively.

FIG. 3 illustrates an example of a QR code as a kind of two-dimensional code, and FIG. 4 schematically illustrates a structure of a QR code shown in FIG. The existing one-dimensional bar code is basically a configuration that can only contain numerical information of up to 20 letters in the horizontal arrangement. However, QR code utilizes the width and height, the maximum number is 7,089, the maximum number is 4,296, and the maximum number of Chinese characters is 1,817 Dimensional structure that can record the degree of the image. The barcode can only record information of a specific product name or manufacturer at best, but the QR code can include a long sentence Internet address (URL), photograph and video information, map information, and business card information. In recent years, QR codes have become widely used as on-line and off-line as they become important public relations / marketing tools for companies.

As shown in FIGS. 3 and 4, the QR code has a quadrangle shape, a position detection symbol 31 at three corners, a reference cell 33 at the lower right portion in the center portion, and a remaining region in the data region 35). An Internet address (URL), photograph and moving picture information, map information, business card information, and the like are two-dimensionally coded and printed in the data area.

When the QR code is read by the QR code reader, the code of the data area is decoded and becomes the coded information. Internet address (URL), picture and moving picture information, map information, business card information, etc.) are displayed on the display unit in the data area. For example, by loading and executing a QR code reader application on a smart phone, codes of a data area captured by reading a QR code from a camera mounted on the smart phone are decoded and coded in a coded data area, It is displayed on the display window.

Hereinafter, the term "document" is used as a meaning including both the document shown in Fig. 1, the securities shown in Fig. 2, and the printing means such as a printer such as a receipt, test report, contract, do.

In recent years, printing-related equipment such as color printers and scanners and image processing technologies have developed, making it difficult to visually identify the original and the difference when copying the published document. In addition, it was not easy to scan the document, correct the scanned image by an image correction program such as Photoshop, and check the corrected contents even when printing the corrected image.

Various techniques have been developed for checking whether a document has been falsified in response to the development and development of technology that can be used for forgery or falsification of the document. However, techniques for blocking forgery and falsification of documents have not been developed, There is no method that can simply confirm whether or not it has been developed. Therefore, it is necessary to provide a method that can forgery the forgery and falsification of the document and can easily and quickly confirm whether or not the document is forged or falsified.

Korean Unexamined Patent Publication No. 2009-0122657

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the related art as described above, and it is an object of the present invention to provide a printer staghornography method and a printer staghornography method, in which forgery and falsification of a document can be fundamentally blocked, And an object of the present invention is to provide a method of generating a document provided with a forgery preventing means using the method and a method for confirming forgery of the document.

In order to achieve the above object, the present invention has printed document information and forgery preventing means, wherein the forgery preventing means comprises a two-dimensional code having a data area and a plurality of halftone dots; Wherein the data area of the two-dimensional code includes a first data area in which the document information is coded, and a second data area in which the document data and the plurality of halftone dot encoded data are generated and coded by the hash algorithm, The present invention provides a document provided with a forgery prevention means using a technique.

The encoding data and the document information of the plurality of halftone dots are encrypted by the encryption key, the hash value is generated by the hash algorithm, and is coded in the second data area of the two-dimensional code.

In the above, the two-dimensional code forms a blank area between the data area and the data area and has a printed border to surround the data area; A blank area is formed between the border and the data area, and the plurality of halftone dots are printed in the blank area.

In the above, the first data area includes dummy halftone dot data information for a plurality of halftone dots in addition to document information.

According to another aspect of the present invention, there is provided a document printing apparatus comprising a document creating apparatus having a hash algorithm and a two-dimensional code generating function, and a document printing apparatus connected to the document creating apparatus for receiving and printing information from the document creating apparatus, And the document information is printed as a printed document, and the forgery preventing means is a two-dimensional code having a data area consisting of a first data area and a second data area; A hash value generation step in which halftone dot data as a plurality of halftone dot information are generated and stored in a storage unit; a hash value generation step in which a hash value and an input document information are generated and stored by a hash algorithm; Dimensional code; and a hash value code data generation step of converting the hash value into data for two-dimensional code and storing the converted hash value code data; A code generated from the document information code data is printed in the first data area, a code generated from the hash value code data is printed in the second data area, the two-dimensional code is printed together with the document information, And printing is performed on the document together with the two-dimensional code according to the generated halftone dot data. The present invention also provides a method of generating a document including a forgery preventing means using a printer staghraphography technique.

In the above step, the halftone dot data is generated by the random function in the halftone dot data generation step.

The method may further include generating dummy dot data, wherein dummy dot data is generated and stored in a storage unit, wherein the dummy dot data is generated by a random function; In the document information code data generation step, the dummy halftone dot data is also coded and converted into two-dimensional code data and stored, and the first data area of the two-dimensional code is coded together with the document information code and printed.

The present invention relates to a document falsification confirmation apparatus having a camera, a storage unit, and a display window, and having a two-dimensional code reader program and a hash algorithm, and a document generated by the method according to any one of claims 5 to 7 The method comprising: A two-dimensional code reader program is executed and a two-dimensional code printed on a document is imaged by a camera; an image pickup step of picking up document information from a code of a first data area of a data area constituting the picked- Acquiring a hash value from the code of the second data area, acquiring a halftone dot information from which the halftone dot information is obtained, and comparing the hash value with the hash value generated by the hash algorithm, Wherein the hash value obtained in the code of the second data area is compared with the comparison hash value stored in the storage unit and is compared with a hash value displayed on the display window. A method for confirming forgery of a document provided with means is provided.

In the above, the halftone dot information acquiring step includes an image conversion step of converting the captured and stored anti-falsification means image from the RGB image to the CMYK image, and a color selection step of setting the specific color element to 100% and the remaining color elements to 0% And a halftone dot code generation step of generating a halftone dot code from the pixel information of the halftone dot forming the forgery prevention means.

In the above, the halftone dot information acquiring step includes an image conversion step of converting the captured and stored anti-falsification means image from the RGB image to the CMYK image, and a color selection step of setting the specific color element to 100% and the remaining color elements to 0% And a halftone dot code generation step of generating a halftone dot code from the pixel information of the halftone dot forming the forgery prevention means.

According to the document generation method and the forgery proof confirmation method for the document provided with the anti-falsification means using the printer steganography technique according to the present invention, it is possible to prevent the forgery and falsification of the document from being inherently prevented, There is an effect that can be. Also, since the halftone dot is printed on the margin between the two-dimensional code and the frame, damage is prevented, and it is possible to check whether or not the image has been falsified by one shot.

1 shows an example of a document,
2 is an example of a cashier's check shown for explaining a cashier's check,
3 is an example of a QR code which is a two-dimensional code,
Fig. 4 schematically shows the QR code shown in Fig. 3,
Fig. 5 is a diagrammatic illustration of a document with anti-fake means according to the invention,
FIG. 6 is an exemplary illustration of a security having anti-counterfeiting means according to the present invention,
FIG. 7 shows a forgery preventing means provided in a document according to the present invention,
Fig. 8 is an enlarged view of the blank area in Fig. 7,
9 shows an example of a system for outputting a document having the anti-falsification means according to the present invention,
FIG. 10 is a view for explaining a process of generating a two-dimensional code to be printed on a document having anti-falsification means according to the present invention.

Hereinafter, a document and a method for preventing forgery and falsification provided with the forgery preventing means using the printer staghraphography technique according to the present invention will be described in detail with reference to the drawings.

FIG. 5 schematically illustrates a document having anti-counterfeiting means according to the present invention, FIG. 6 illustrates an example of a securities having counterfeiting prevention means according to the present invention, and FIG. FIG. 8 is an enlarged view of the blank area in FIG. 7, and FIG. 9 is a view showing an example of a system in which a document having anti-falsification means according to the present invention is output FIG. 10 is a view for explaining a process of generating a two-dimensional code printed on a document having anti-falsification means according to the present invention.

9, the document 200 having the anti-falsification means using the printer steganography technique according to the present invention includes a document creation device (hereinafter, referred to as " document creation device ") having a hash algorithm and a function of generating a two- And a document printing apparatus 130 connected to the document creating apparatus 110 and serving as a printer on which a document is printed. The hash algorithm and the two-dimensional code generation program may be stored in the storage unit of the document generation apparatus 110, but may be provided online. The document stored in the document creating apparatus 110 or transmitted through the Internet is transferred to the document printing apparatus 130 by the user's print command and printed.

Examples of the document creating apparatus 110 include a computer such as a PC including a display unit (e.g., LCD), an input unit (e.g., a keyboard and a mouse), a storage unit, and a control unit (microcomputer) Printers (inkjet printers, laser printers, etc.).

As shown in FIGS. 5 and 6, the document 200 having the anti-falsification means using the printer staghraphic technique according to the present invention includes document information serving as the content of the document and anti-falsification means 210. The anti-falsification means 210 is printed on a margin portion of a document on which document information is not printed.

The personalization institution 201, the destination 203, the issue date 205, the title, the content 207 of the document, the amount of the document, and the like are described in the document, and the seal of the issuing agency is stamped 209 , A document number 202, and the like are described.

FIG. 7 shows an example of the anti-falsification means 210 printed on the document 200 shown in FIGS. 5 and 6. The anti-falsification means 210 provided in the document 200 of the present invention Dimensional code (e.g., QR code), a plurality of halftone dots 240, and a frame 217 surrounding the two-dimensional code, as shown in Fig. The two-dimensional code has a quadrangular outer shape and includes a positioning symbol 211, a reference cell 213, and a data area 215. The border 217 is printed in a form surrounding the two-dimensional code so as to surround the two-dimensional code so that a blank area 219 is formed between the two-dimensional code and the border 217. The plurality of halftone dots 240 Dimensional code and the border 217. In this case, The plurality of halftone dots 240 are arranged in the horizontal and vertical directions. The halftone dot 240 is printed in a pale yellowish color such as a unique mark of a security so as not to be visually recognized. The size of the halftone dot 240 is such that when the anti-fake means 210 is binarized and labeled, the two-dimensional code is displayed when the anti-fake means 210 is photographed or scanned into an image, Which is smaller than the number of pixels constituting the other part to be formed.

The rim 217 also has a quadrangular shape. The location symbol 211 and the reference cell 213 constituting the two-dimensional code constitute a conventional QR code, and a detailed description thereof will be omitted. In the data area 215, information such as document information is generally coded into a print area.

The data area 215 constituting the anti-falsification means 210 printed on the document 200 according to the present invention includes a first data area 215-1 and a second data area 215-2. The first data area 215-1 and the second data area 215-2 may be divided vertically and the upper part may be a first data area 215-1 and the lower part may be a second data area 215-2).

Document information is coded and printed in the first data area 215-1. The document information includes the information entered by the document creator and the information the document has as basic information (e.g., the name of the issuing institution in FIG. 5, the cashier's check in FIG. 6, and the like). The document information and encoded data of a plurality of halftone dots 240 to be printed in the margin area 219 are generated as a hash value by the hash algorithm and the generated hash value is coded and printed in the second data area 215-2 do.

Encoded data and document information of the plurality of halftone dots 240 are encrypted by a cryptographic key stored in the storage unit of the document creation apparatus 110 or provided online through a hash algorithm in order to further prevent tampering or tampering A hash value may be generated and coded to be printed in the second data area 215-2 of the two-dimensional code.

A description will be given of a method of generating a document printed with the anti-falsification means using the printer staghraphography technique.

The document 200 on which the forgery preventing means 210 shown in FIG. 5 to FIG. 7 is printed may be a document creating apparatus 110 (e.g., a PC) having a hash algorithm and a two- And a document printing apparatus 130 (e.g., a printer) that is connected to the document creating apparatus 110 and receives information from the document creating apparatus 110 and prints the information. The hash algorithm and the two-dimensional code generation program, which is a two-dimensional code generation function, may be stored in a storage unit (not shown) of the document generation apparatus 110, or may be provided and executed online.

The document created by the document creating apparatus 110 constituting the document printing system 100 includes the forgery preventing means 210 having the first data area 215-1 and the second data area 215-2 as described later And is printed together with the document information. The counterfeit preventing means 210 is printed on a margin portion where document information is not described.

The document information inputted by the document creator during document creation is executed by the printing instruction and the two-dimensional code generating program is executed and coded and printed in the first data area 215-1 of the two-dimensional code. In the first data area 215-1 of the two-dimensional code, dummy halftone dot data described later may be coded and printed together with a document information code.

The halftone dot data for a plurality of halftone dots 240 to be printed in the margin area 219 between the two-dimensional code and the frame 217 is generated and stored in the storage unit when the document creator inputs a save command or a print command.

FIG. 8 shows an example of the halftone dot 240 and the halftone dot data printed in the margin area 219 (219-1) shown in FIG. The document creating device 110 has a random function, and the halftone dot data is generated by a random function. The portion indicated by "A" in FIG. 8 shows an example of the dot data generated by executing the random function, and the dot data in each column in the blank area 219 (219-1) as shown in FIG. 8 The dot data of each column as "1111111010", "1101011101", and "1000101000" are generated in ten binary combinations and stored in the storage unit. According to the dot data, the dot 240 is printed in the margin area 219 as shown in FIGS. The halftone dot 240 is printed at a predetermined size at a predetermined position in the blank area. The halftone dot 240 is not printed at the position where the halftone dot data is "0", and the halftone dot 240 is printed at the position of "1". The halftone dots 240 may be printed in the same size, but may be printed in different sizes by executing a random function.

On the other hand, the random function is executed twice to generate dot data and dummy dot data, respectively. The halftone dot data and the dummy halftone dot data are generated in a binary combination having the same size and stored in a storage unit. For example, if the halftone dot data is generated by 10 binary combinations such as "1100100010 ", the dummy halftone dot data is also generated by 10 binary combinations such as" 0010011000 ". When the hash value is generated from the document information and the halftone dot data by the hash algorithm, the halftone dot data such as "1100100010" is generated as the hash value together with the document information, Is set to "1110111010 ", the arrangement of the halftone dots 240 in the blank area and the halftone dot data do not coincide with each other, so that forgery and falsification by simple copying can be prevented. The halftone dot data and the dummy halftone dot data are "XORed ", so that they become" 0 " The XOR operation is also executed in the decoding process to check the halftone dot data.

As shown in FIG. 10, the hash value is generated by executing the hash algorithm together with the document information, and the generated hash value is encoded and printed in the second data area 215-3 of the two-dimensional code. When a print command of a document creator is inputted, a hash algorithm is executed to generate a hash value from the halftone dot data and the document information, and stores the generated hash value in the storage unit. The hash value stored in the storage unit is executed, Area 215-3.

A method of confirming forgery and falsification of a document printed with a forgery preventing means using a printer steganography technique will be described.

The document 200 on which the forgery preventing means 210 as described above is printed can be easily confirmed whether or not the document 200 is up-modulated from the forgery preventing means 210. [ The forgery and falsification is executed by a document falsification confirmation apparatus having a camera, a storage unit, and a display window and having a two-dimensional code reader program and a hash algorithm. An example of a document forgery verification device is a smart phone.

The forgery proofing method of the document 200 on which the counterfeit preventing means 210 is printed is a method in which the counterfeit preventing means 210 including the two- The document information is acquired from the code of the first data area 215-1 of the data area constituting the captured anti-falsification means 210 and the hash value is acquired from the code of the second data area 215-2 A halftone dot information acquiring step of acquiring halftone dot data from the halftone dot 240 printed in the margin area 219 around the two-dimensional code; and a halftone dot acquiring step of generating document information and halftone dot data as a hash value by a hash algorithm A hash value obtained in the code of the second data area 215-2 is compared with a comparison hash value stored in the storage unit and is compared with a hash value displayed on the display window Loses.

The hash value and the document information obtained from the halftone dots printed around the two-dimensional code are generated by the hash algorithm (referred to as a "comparison hash value"), and the comparison hash value and the second data area 215- 2) is displayed on the display window. If the hash value is the same as the comparison hash value, there is no forgery and falsification. If the hash value and the comparison hash value are different, it is judged that the document is forged.

The process of obtaining the document information and the dummy halftone dot data from the code of the first data area 215-1 and the process of obtaining the hash value from the code of the second data area 215-2 can be performed by notifying Description thereof will be omitted.

The halftone dot information obtaining step will be described.

The halftone dot information obtaining step may include an image transforming step of transforming the image into RGB (C: Cyan, M: Magenta, Y: Yellow, K: , A color selection step of setting a specific color (yellow) element to 100% and a remaining color element to 0% in the binarization step, a labeling step, a halftone dot pixel coordinate extraction step, A position coordinate extraction step, and a halftone dot data acquisition step.

In the image conversion step, the image of the anti-falsification means 210 is converted from the RGB image to the CMYK image. In the above, the conversion from the RGB image to the CMYK image is performed by capturing or scanning the R, G, and B component values of each pixel constituting the obtained RGB image with C, M, and Y through calculation logic. For example, it can be calculated through the following calculation logic and converted from RGB image to CMYK image.

float r, g, b;

k = Math.min (1-r, 1-g, 1-b);

if (k == 1) {c = m = y = 0; k = 1;

else {

c = (1 - r - k) / (1 - k);

m = (1 - g - k) / (1 - k);

y = (1 - b - k) / (1 - k)

Where r, g, and b represent the values of r, g, and b of each pixel forming the RGB image, and c, m, and y represent the c, m, and y values of each pixel forming the CMYK image.

The halftone is printed in a pale yellow system, such as the unique code of the securities, to avoid being identified by the naked eye. In the color element selection step, the values of the remaining components excluding the Y component in each pixel constituting the converted CMYK image are set to "0 ", and when the image is binarized, an image of the dot arrangement as shown in FIG. 8 is obtained.

In the labeling step, the pixels adjacent to each other in the binarized image are displayed and stored at the same number, and the number of pixels labeled with the same number is counted. If the number of pixels labeled with the same number is greater than a predetermined value, the color component of the pixel becomes "0" and the halftone dot 240 is separated. When the halftone dot 240 is separated, the average value of the coordinates of the pixels constituting each halftone dot 240 is calculated and the position of each halftone dot 240 is calculated.

When the positions of the halftone dots 240 are calculated, the distance between the halftone dots 240 is calculated, and the shortest distance among the calculated distances is the distance between the halftone dots. If the distance between two halftone dots is larger than the shortest distance, an operation is performed in which the distance between two halftone dots is divided by the shortest distance, and dot data between two halftone dots and two halftone dots are obtained from the calculated result. For reference, when the distance between two halftone dots is divided by the shortest distance, if the value is 2, the halftone data between two halftone dots and two halftone dots becomes "1001". By such a crime prevention, the halftone dot data is obtained.

100: document printing system 110: document writing device
130: Document printing device

Claims (9)

delete delete delete delete A hash algorithm and a two-dimensional code generating function, and a document printing apparatus connected to the document creating apparatus for receiving and printing information from the document creating apparatus, and forgery prevention means and document information printing The counterfeit preventing means is a two-dimensional code having a data area consisting of a first data area and a second data area; A hash value generation step in which halftone dot data as a plurality of halftone dot information are generated and stored in a storage unit; a hash value generation step in which a hash value and an input document information are generated and stored by a hash algorithm; Dimensional code; and a hash value code data generation step of converting the hash value into data for two-dimensional code and storing the converted hash value code data; A code generated from the document information code data is printed in the first data area, a code generated from the hash value code data is printed in the second data area, the two-dimensional code is printed together with the document information, And printing is performed on the document together with the two-dimensional code according to the generated halftone dot data. 6. The method of claim 5, wherein in the generating of the halftone dot data, the halftone dot data is generated by a random function. 6. The method of claim 5, further comprising dummy dot data generation step of generating dummy dot data and storing the dummy dot data in a storage unit, Generated; Wherein the dummy halftone dot data is also encoded and converted into two-dimensional code data and stored in a first data area of the two-dimensional code together with a document information code, A method of generating a document provided with a forgery prevention means using a graphic method. A document falsification confirmation apparatus having a camera, a storage unit, and a display window and having a two-dimensional code reader program and a hash algorithm, characterized in that it is checked whether a document generated by the method according to any one of claims 5 to 7 is falsified Lt; / RTI > A two-dimensional code reader program is executed and a two-dimensional code printed on a document is imaged by a camera; an image pickup step of picking up document information from a code of a first data area of a data area constituting the picked- Acquiring a hash value from the code of the second data area, acquiring a halftone dot information from which the halftone dot information is obtained, and comparing the hash value with the hash value generated by the hash algorithm, Wherein the hash value obtained in the code of the second data area is compared with the comparison hash value stored in the storage unit and is compared with a hash value displayed on the display window. A method for confirming forgery of a document provided with means. 9. The method of claim 8, wherein the obtaining of the halftone dot information comprises: capturing and storing the stored anti-falsification means image in CMYK (Cyan, M: Magenta, Y: Yellow, K: Blak) image, a color selection step of setting a specific color element to 100% and remaining color elements to 0% in the image, and a color selection step of selecting, from the pixel information of the halftone dot, And generating a halftone dot code by using a printer staghornography technique.

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