CN109726789B - Anti-fake two-dimensional code with hidden digital signature - Google Patents
Anti-fake two-dimensional code with hidden digital signature Download PDFInfo
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- CN109726789B CN109726789B CN201811569099.1A CN201811569099A CN109726789B CN 109726789 B CN109726789 B CN 109726789B CN 201811569099 A CN201811569099 A CN 201811569099A CN 109726789 B CN109726789 B CN 109726789B
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Abstract
A digital signature hidden anti-counterfeiting two-dimensional code is characterized in that a digital signature image is implanted into a clear code two-dimensional code image through a metameric color matching algorithm, a halftone screening and an information hiding technology to generate a special two-dimensional code image containing a digital signature, the information of the clear code two-dimensional code image can be read by the two-dimensional code image under visible light, the digital signature image can be displayed under infrared light, whether a printed matter is a genuine product or not is represented by the digital signature image, if the two-dimensional code is copied in a counterfeit mode, the color characteristic of metameric color is lost, the digital signature image is lost, and therefore whether the printed matter of a label, a bill and a valuable document has a counterfeit infringement problem or not can be identified by using the characteristic.
Description
The technical field is as follows:
the invention relates to an anti-counterfeiting printing technology, in particular to an anti-counterfeiting two-dimensional code with a hidden digital signature, which can be used for anti-counterfeiting of various printed products.
The background technology is as follows:
the current common anti-counterfeiting methods include the following: the first is a laser anti-counterfeiting mark, the logo or special identification pattern of the product is printed into an anti-counterfeiting label of the product by using a laser recessive ink fluorescent ink printing technology, and the same type of product uses the same label, so that the anti-counterfeiting label is easy to forge, and the forged anti-counterfeiting label is used on a fake product, so that the authenticity of the product is confused, and the effective anti-counterfeiting is difficult. The second is the password antifake label, its adopted method is that each product encodes a series of numbers, the code of each product is different, print this number on the label and cover up, store this number in the computer database that can supply consumer to inquire at the same time, when consumers purchase products, the number on the sign inputs the number on the computer database to compare and discern through the telephone or network computer, the same is true, the difference is false, the method is simple, discern easy, difficult counterfeit, but in the actual use, print the label after the code data is unified and produced by the computer. The true and false code data representing the product can be copied illegally to be counterfeited, meanwhile, the code can also recycle the code on the product which is not inquired to be counterfeited to be attached to the fake product, and the anti-counterfeiting effect is difficult to ensure. The third is texture anti-counterfeiting, the texture feature on the label is used for anti-counterfeiting, and the label is difficult to forge, but only the serial number of the label is set and is a plain code, each label can be repeatedly inquired, and counterfeiters can forge the serial number on the label and the necessary texture feature reflected in inquiring, namely whether the phenomenon exists in a square or not, in batches according to the feature after the counterfeiters copy the serial number on the label and the necessary texture feature in inquiring by a warehouse custodian or a salesperson. The fourth is metameric ink anti-counterfeiting, which is an anti-counterfeiting printing technology based on metameric phenomenon, namely, two substances are used for representing the same color under one light source, but representing different colors under the other light source, so that anti-counterfeiting is realized, the metameric proportion is easy to determine, and therefore, the anti-counterfeiting effect is difficult to ensure.
In summary, the existing anti-counterfeiting methods have certain defects, so that the counterfeiting of the product cannot be prevented at all.
The invention comprises the following steps:
aiming at the defects of the existing anti-counterfeiting printing technology of various printed products, the invention improves the prior art, and provides an anti-counterfeiting two-dimensional code with hidden digital signature.
The four colors of cyan, yellow and black are generally described by CMYK, and metamerism generally refers to that the CMYK four inks of color printing form a group of matching color matching inks, and the inks are the same color, namely the same color, when seen under visible light; under infrared light, the color spectrum difference, i.e. the different spectrum, is generated by different proportions of the CMYK four inks, and the inks can show different colors, which is called metamerism.
The technical scheme adopted for solving the technical problems is as follows: the two-dimensional code image is formed by the open code information, called an open code two-dimensional code image, the digital signature information is converted into binary code stream information to form a digital signature image, in order to hide the digital signature image in the open code two-dimensional code image, the digital signature image and the open code two-dimensional code image are printed on the same position of a page in a completely overlapped mode, color blocks of the digital signature image and the open code two-dimensional code image are overlapped together in a one-to-one correspondence mode, the mesh points overlapped in a one-to-one correspondence mode are divided into four types, the first type color block open code two-dimensional code image is required to be displayed in white under visible light and the digital signature image is required to be displayed in white under infrared light, the second type color block open code two-dimensional code image is required to be displayed in black under visible light and the digital signature image is required to be displayed in white under infrared light, the third type color block open code two-dimensional code image is required to be displayed in black under visible light and the digital signature image is required to be displayed in black under infrared light,
using CMYK four-color ink to generate four groups of matching color matching ink composed of CMYK four-color ink, wherein the ratio of the four-color ink of the first group of matching color ink is C 1 M 1 Y 1 K 1 And the first group of color matching ink shows white color under visible light and infrared light through proportion color matching, and the four-color ink proportion of the second group of color matching ink is C 2 M 2 Y 2 K 2 And the second color matching ink is enabled to display black under visible light and white under infrared light through proportion color matching, and the proportion of the four inks of the third color matching ink is C 3 M 3 Y 3 K 3 And the third color matching ink is enabled to show white color under visible light and black color under infrared light through proportion color matching, and the proportion of the four inks of the fourth color matching ink is C 4 M 4 Y 4 K 4 And the fourth color matching ink is enabled to display black under visible light and infrared light through proportion color matching,
the method comprises the steps of modulating color blocks of a plain two-dimensional code image by black-and-white color blocks of a digital signature image, printing the corresponding color blocks of the digital signature image and the plain two-dimensional code image which need to be displayed in white under visible light and infrared light by adopting a first set of color matching ink, printing the corresponding color blocks of the plain two-dimensional code image which needs to be displayed in black under visible light and the digital signature image which needs to be displayed in white under infrared light by adopting a second set of color matching ink, printing the corresponding color blocks of the plain two-dimensional code image which needs to be displayed in white under visible light and the corresponding color blocks of the digital signature image which needs to be displayed in black under infrared light by adopting a third set of color matching ink, printing the corresponding color blocks of the digital signature image and the plain two-dimensional code image which need to be displayed in black under visible light and the infrared light by adopting a fourth set of color matching ink, implanting the digital signature image into the plain two-dimensional code image to generate a special two-dimensional code image containing the digital signature image, displaying the plain two-dimensional code image under visible light, scanning the information of the plain two-dimensional code image in the area where the digital signature image and the plain two-dimensional code image are printed in overlap, displaying the digital signature image under infrared light, and displaying the false signature image, and losing the characteristics of the digital signature image if the false signature image is lost by the false signature image, and the false signature image is lost if the false signature is lost, and the false signature is lost.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of generation of an anti-counterfeit two-dimensional code with a hidden digital signature.
Fig. 2 is a block diagram for identifying an anti-counterfeit two-dimensional code with a hidden digital signature.
Fig. 3 is a block diagram for distinguishing the authenticity of the anti-counterfeiting two-dimensional code with the hidden digital signature.
Fig. 4 is a flow chart for generating color modulation of the anti-counterfeiting two-dimensional code with the hidden digital signature.
Fig. 5 is a partial view of the two-dimensional code image and the digital signature image.
Detailed Description
In fig. 1, 4 and 5, a two-dimensional code image is formed by the plain code information, called a plain code two-dimensional code image, the digital signature information is converted into binary code stream information to form a digital signature image, in order to hide the digital signature image in the plain code two-dimensional code image, we print the digital signature image and the plain code two-dimensional code image on the same position of a page in a completely overlapped manner, and make the color blocks of the digital signature image and the plain code two-dimensional code image overlap together in a one-to-one correspondence manner, the dots overlapped in one-to-one manner are divided into four types, the first type color block plain code two-dimensional code image is required to appear white in visible light and the digital signature image is required to appear white in infrared light, the second type color block plain code two-dimensional code image is required to appear black in visible light and the digital signature image is required to appear black in infrared light, the fourth type color block plain code two-dimensional code image is required to appear black in visible light and the digital signature image is required to appear black in infrared light,
using CMYK four-color ink to generate four groups of matching color matching ink composed of CMYK four-color ink, wherein the ratio of the four-color ink of the first group of matching color ink is C 1 M 1 Y 1 K 1 And the first group of color matching ink shows white color under visible light and infrared light through proportion color matching, and the four-color ink proportion of the second group of color matching ink is C 2 M 2 Y 2 K 2 And the second color matching ink is enabled to display black under visible light and white under infrared light through proportion color matching, and the proportion of the four inks of the third color matching ink is C 3 M 3 Y 3 K 3 And the third color matching ink is enabled to show white color under visible light and black color under infrared light through proportion color matching, and the proportion of the four inks of the fourth color matching ink is C 4 M 4 Y 4 K 4 And the fourth color matching ink is enabled to display black under visible light and infrared light through proportion color matching,
the black-and-white color block of the digital signature image is used for modulating the color blocks of the plain code two-dimensional code image, the first group of color matching ink is used for printing the corresponding color blocks of the digital signature image and the plain code two-dimensional code image which need to be displayed in white under visible light and infrared light, the second group of color matching ink is used for printing the corresponding color blocks of the plain code two-dimensional code image which needs to be displayed in white under visible light and the digital signature image which needs to be displayed in black under infrared light, the third group of color matching ink is used for printing the corresponding color blocks of the digital signature image and the plain code two-dimensional code image which need to be displayed in black under visible light and infrared light, the fourth group of color matching ink is used for printing the corresponding color blocks of the digital signature image and the plain code two-dimensional code image which need to be displayed in black under visible light and infrared light, the digital signature image is implanted into the plain code two-dimensional code image to generate the special two-dimensional code image containing the digital signature image,
in fig. 2 and 3, in the area where the digital signature image and the plain two-dimensional code image are printed in an overlapping manner, the plain two-dimensional code image is displayed under visible light, the plain two-dimensional code image information can be read out in a scanning manner, the digital signature image is displayed under infrared light, whether the printed matter is genuine or not is characterized by the digital signature image information, if the two-dimensional code is copied in a counterfeit manner, the digital signature image is lost due to the fact that the color characteristics of metamerism are lost, and therefore whether the printed matter of labels, notes and securities has a counterfeit infringement problem or not can be identified by using the characteristics.
Claims (1)
1. A medium bearing an anti-counterfeiting two-dimensional code with a hidden digital signature is characterized in that: the two-dimensional code image is formed by the open code information, called an open code two-dimensional code image, the digital signature information is converted into binary code stream information to form a digital signature image, in order to hide the digital signature image in the open code two-dimensional code image, the digital signature image and the open code two-dimensional code image are printed on the same position of a page in a completely overlapped mode, color blocks of the digital signature image and the open code two-dimensional code image are overlapped together in a one-to-one correspondence mode, the mesh points overlapped in a one-to-one correspondence mode are divided into four types, the first type color block open code two-dimensional code image is required to be displayed in white under visible light and the digital signature image is required to be displayed in white under infrared light, the second type color block open code two-dimensional code image is required to be displayed in black under visible light and the digital signature image is required to be displayed in white under infrared light, the third type color block open code two-dimensional code image is required to be displayed in black under visible light and the digital signature image is required to be displayed in black under infrared light,
using CMYK four-color ink to generate four groups of matching color matching ink composed of CMYK four-color ink, wherein the ratio of the four-color ink of the first group of matching color ink is C 1 M 1 Y 1 K 1 And the first group of color matching ink shows white color under visible light and infrared light through proportion color matching, and the four-color ink proportion of the second group of color matching ink is C 2 M 2 Y 2 K 2 And the second color matching ink is enabled to display black under visible light and white under infrared light through proportion color matching, and the proportion of the four inks of the third color matching ink is C 3 M 3 Y 3 K 3 And the third color matching ink is enabled to show white color under visible light and black color under infrared light through proportion color matching, and the proportion of the four inks of the fourth color matching ink is C 4 M 4 Y 4 K 4 And the fourth color matching ink is enabled to display black under visible light and infrared light through proportion color matching,
the method comprises the steps of modulating color blocks of a plain two-dimensional code image by black-and-white color blocks of a digital signature image, printing the corresponding color blocks of the digital signature image and the plain two-dimensional code image which need to be displayed in white under visible light and infrared light by adopting a first set of color matching ink, printing the corresponding color blocks of the plain two-dimensional code image which needs to be displayed in black under visible light and the digital signature image which needs to be displayed in white under infrared light by adopting a second set of color matching ink, printing the corresponding color blocks of the plain two-dimensional code image which needs to be displayed in white under visible light and the corresponding color blocks of the digital signature image which needs to be displayed in black under infrared light by adopting a third set of color matching ink, printing the corresponding color blocks of the digital signature image and the plain two-dimensional code image which need to be displayed in black under visible light and the infrared light by adopting a fourth set of color matching ink, implanting the digital signature image into the plain two-dimensional code image to generate a special two-dimensional code image containing the digital signature image, displaying the plain two-dimensional code image under visible light, scanning the information of the plain two-dimensional code image in the area where the digital signature image and the plain two-dimensional code image are printed in overlap, displaying the digital signature image under infrared light, and displaying the false signature image, and losing the characteristics of the digital signature image if the false signature image is lost by the false signature image, and the false signature image is lost if the false signature is lost, and the false signature is lost.
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