CN102945458B - One-parameter increases progressively and becomes sequence encrypted binary antiforging printing method - Google Patents

Abstract

A kind of one-parameter increases progressively and becomes sequence encrypted binary antiforging printing method, can scale-of-two anti-counterfeiting information pass through by the method cryptographic calculation and chnnel coding generate binary modulated signal, and by circulation look-up table modulation system, anti-counterfeiting information is embedded in full page with the orderly change of the shape of amplitude, anti-counterfeiting information can be identified when printed matter identification from any one fragment, printed matter anti-counterfeiting field can be widely used in.

Description

Binary Anti-counterfeiting Printing Method with Single Parameter Incremental Variation Encryption

Technical field:

The invention relates to an anti-counterfeiting printing technology, in particular to a single-parameter incremental variable sequence encrypted binary anti-counterfeiting printing technology, which can be used for anti-counterfeiting of various printed products.

Background technique:

The existing relatively common anti-counterfeiting methods are as follows: The first is laser anti-counterfeiting marks, which use laser recessive ink fluorescent ink printing technology to print product logos or special identification patterns into product anti-counterfeiting labels. And the same type of product uses the same label, because the anti-counterfeiting label is easier to forge, and the fake anti-counterfeiting label is used on the counterfeit product, causing the product to be confused, so it is difficult to effectively prevent counterfeiting. The second is the password anti-counterfeiting label. The method adopted is to compile a set of numbers for each product, and the codes of each product are different. The numbers are printed on the labels and covered, and the numbers are stored Into the computer database that can be inquired by consumers. When consumers purchase products, they input the numbers on the logo into the computer database through telephone or networked computer for comparison and identification. The same is true, and the difference is false. The method is simple and easy to identify. It is not easy to forge, but in actual use, because the encoded data is uniformly generated by the computer, the label is printed. The code data representing the authenticity of the product may be illegally copied and falsified. At the same time, the code can also be recycled from the code on the product that has not been inquired to make a label and affixed to the fake product. The anti-counterfeiting effect is difficult to guarantee. The third is texture anti-counterfeiting, which uses the texture features on the label to prevent counterfeiting. Although it is difficult to forge, since only the serial number of the label is set, and it is a clear code, each label can be queried repeatedly, and counterfeiters can store it in the warehouse. The clerk or salesperson plagiarizes the serial number on the label and the necessary texture characteristics reflected when inquiring, that is, the presence or absence of phenomena in the grid, and then forges them in batches according to this characteristic. To sum up, the existing anti-counterfeiting methods have certain shortcomings, and thus cannot fundamentally prevent counterfeit products.

Invention content:

In order to overcome the shortcomings of the existing anti-counterfeiting printing technology for various printed products, the present invention improves the existing technology in view of the shortcomings of the existing anti-counterfeiting printing technology for printed products, and proposes a binary encryption signal to modulate the shape of the AM dots of printed products Encrypted anti-counterfeiting printing technology, this anti-counterfeiting printing technology embeds anti-counterfeiting information in the entire page by changing the shape of AM dots, and can identify anti-counterfeiting information from any fragment when identifying printed matter, so it is highly resistant to shattering and can be read from Fundamentally put an end to the use of photography, scanning and other illegal copying.

The technical solution adopted by the present invention to solve the technical problem is: separately process the amplitude modulation dots and frequency modulation dots in the mixed screen of flexographic printing, and use the anti-counterfeiting information such as image information and text information to generate an 8-bit binary anti-counterfeiting information table , in order to prevent information overflow during the encryption process, the 8-bit binary information in the binary anti-counterfeiting information table is expanded into a 16-bit binary information, and a 16-bit binary anti-counterfeiting information table with all 0s in the upper 8 bits is generated. The i-th group of 16-bit binary information in the 16-bit binary anti-counterfeiting information table is denoted as N _i , i is a positive integer greater than 0, the eight-bit binary encryption parameter is denoted as C, and the encryption parameter C is an integer of 0≦C﹤256 , the two-digit binary operator control variable is denoted as k, the operator control variable k is an integer of 0≦k≦3, the operator Using +, ×, -, ÷ four operators, operator control variable k = 0 They are respectively defined as "+", "×", "-", "÷" operations, when the operator control variable k=1 They are respectively defined as "-", "×", "+", "÷" operations, when the operator control variable k=2 They are respectively defined as "-", "÷", "+", "×" operations, when the operator control variable k=3 They are respectively defined as "÷", "-", "×", and "+" operations, and when the operator control variable k=0, the encryption operation is defined as When the operator control variable k=1, the encryption operation is defined as When the operator control variable k=2, the encryption operation is defined as When the operator control variable k=3, the encryption operation is defined as The initial value of setting encryption parameter C, the initial value k=0 of setting operator control variable k, the position control variable i=1 of 16 binary information N _i of setting 16 groups of binary anti-counterfeiting information tables, from 16 Starting with the first group of 16-bit binary information N ₁ in a set of binary anti-counterfeiting information tables, the 16-bit binary information in the binary anti-counterfeiting information table is encrypted using the above four different encryption calculation formulas in a loop, and at each encryption operation Carry out i+1 and k+1 operations at the same time, as the values of i and k change, by encrypting each group of 16-bit binary information in the 16-bit binary anti-counterfeiting information table, a 16-bit group of anti-counterfeiting information is generated Binary encryption anti-counterfeiting information table, the shape of AM dots is set to two types: □ and ◇, where □ is defined as the number 0 and ◇ is defined as the number 1, and the generated 16-bit binary encrypted anti-counterfeiting information is modulated by the circular look-up method AM dots, so that the shape of the AM dots in the mixed screen can be changed regularly according to the shape of the above two AM dots, so that the shape of the AM dots in the mixed screen can be changed regularly. After modulation, 16 adjacent AM dots form A set of 16-bit binary information enables it to carry anti-counterfeiting information and embeds the anti-counterfeiting information in the entire web site, which can more effectively combat illegal copying based on cameras, scanners, and electronic documents. By non-obviously embedding extractable anti-counterfeiting information in the printed matter, effective proof can be provided for the genuine product, and at the same time, it has strong anti-counterfeiting ability without adding additional anti-counterfeiting costs.

In order to solve the above-mentioned technical problems, the anti-counterfeiting information is first digitized to generate an 8-bit binary anti-counterfeiting information table. The anti-counterfeiting information can be image information, text information, etc., and the 8-bit binary information in the binary anti-counterfeiting information table is extended For a 16-bit group of binary information, generate a 16-bit group of binary anti-counterfeiting information table whose upper 8 bits are all 0, and perform Encryption operation, generate a 16-bit binary encrypted anti-counterfeiting information table, use the 16-bit binary information in the generated 16-bit binary encrypted anti-counterfeiting information table to undergo channel coding, and generate a 16-bit group with error detection and error correction functions binary modulated signal. Channel coding can adopt various forms such as cyclic coding, convolutional coding or Turbo coding, and the original continuous tone image signal is rasterized and mixed to output a halftone mixed screened image signal, including AM and FM dot images Signal, use the generated 16-bit binary modulation signal to modulate the shape of the AM dots in the halftone mixed screen image signal, so that the shape of the AM dots changes regularly according to □ and ◇, so that the halftone The 16 adjacent amplitude modulation dots in the tone mixed screen image signal carry 16-bit binary anti-counterfeiting information through the change of shape, thereby generating a halftone mixed screen image signal with anti-counterfeit information embedded in the entire page dots, realizing anti-counterfeiting printing.

When extracting anti-counterfeiting information, first collect the network dot image signal, through the fuzzy recognition of the shape of the AM network dot, distinguish the shape of the AM network dot, extract the edge signal and shape information of the AM network dot, demodulate the shape information of the AM network dot, and output 16-bit one Set of binary modulated signals. Perform channel decoding on the 16-bit binary modulated signal output by demodulation, generate a 16-bit binary decryption anti-counterfeiting information table after channel decoding, record the 16-bit binary information in the binary decryption anti-counterfeiting information table as H _i , pass It can be seen from the encryption process that when the operator control variable k=0 When the operator control variable k=1 When the operator control variable k=2 When the operator control variable k=3 The initial value of the position control variable of 16 binary information H _i in the binary decryption anti-counterfeiting information table is set as i=1, from the first group H ₁ in the binary decryption anti-counterfeiting information table, to each group in the binary decryption anti-counterfeiting information table 16-bit binary information carried Decryption operation, solve the binary anti-counterfeiting information N _i , generate a 16-bit binary anti-counterfeiting information table whose upper 8 bits are all 0, remove the upper 8 bits, generate an 8-bit binary anti-counterfeiting information table, restore the anti-counterfeiting signal and output the anti-counterfeiting information.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Figure 1 is a flow chart of loading anti-counterfeiting information.

Figure 2 is a flow chart of extracting anti-counterfeiting information.

detailed description

In flow chart 1 of loading anti-counterfeiting information, the original anti-counterfeiting information (image, text) is digitized to generate an 8-bit binary anti-counterfeiting information table, and the 8-bit binary information in the binary anti-counterfeiting information table is expanded to 16-bit one Group binary information, generate a 16-bit binary anti-counterfeiting information table whose upper 8 bits are all 0, the i-th group of 16-bit binary information in the 16-bit binary anti-counterfeiting information table is recorded as N _i , i is a positive integer greater than 0 , the eight-digit binary encryption parameter is denoted as C, the encryption parameter C is an integer of 0≦C﹤256, the control variable of a two-digit binary operator is denoted as k, the operator control variable k is an integer of 0≦k≦3, and the operator Using +, ×, -, ÷ four operators, operator control variable k = 0 They are respectively defined as "+", "×", "-", "÷" operations, when the operator control variable k=1 They are respectively defined as "-", "×", "+", "÷" operations, when the operator control variable k=2 They are respectively defined as "-", "÷", "+", "×" operations, when the operator control variable k=3 They are respectively defined as "÷", "-", "×", and "+" operations, and when the operator control variable k=0, the encryption operation is defined as When the operator control variable k=1, the encryption operation is defined as When the operator control variable k=2, the encryption operation is defined as When the operator control variable k=3, the encryption operation is defined as The initial value of setting encryption parameter C, the initial value k=0 of setting operator control variable k, the position control variable i=1 of 16 binary information N _i of setting 16 groups of binary anti-counterfeiting information tables, from 16 Starting with the first group of 16-bit binary information N ₁ in a set of binary anti-counterfeiting information tables, the 16-bit binary information in the binary anti-counterfeiting information table is encrypted using the above four different encryption calculation formulas in a loop, and at each encryption operation Carry out i+1 and k+1 operations at the same time, as the values of i and k change, by encrypting each group of 16-bit binary information in the 16-bit binary anti-counterfeiting information table, a 16-bit group of anti-counterfeiting information is generated Binary encryption anti-counterfeiting information table, the shape of AM dots is set to two types: □ and ◇, where □ is defined as the number 0 and ◇ is defined as the number 1, and the generated 16-bit binary encrypted anti-counterfeiting information is channel coded to generate A binary modulated signal of a faulty function. Channel coding can adopt various forms such as cyclic coding, convolutional coding or Turbo coding. The original continuous tone image signal is rasterized and mixed and screened to output a halftone mixed screen image signal, including amplitude modulation dot and frequency modulation dot image signals. Utilize the generated binary modulation signal and use the circular look-up modulation method to modulate the shape of the AM dots in the mixed screen image signal, so that the shape of the AM dots in the mixed screen can be changed regularly, and generate a halftone mixed screen image embedded with anti-counterfeiting information The signal, through the cyclic look-up table modulation method, makes the adjacent 16-bit AM dots generate a set of 16-bit binary data through shape changes, making them carry anti-counterfeiting information, and embed the anti-counterfeiting information in the entire page dots to realize anti-counterfeiting printing.

In the flow chart 2 of extracting anti-counterfeiting information, when extracting anti-counterfeiting information, first collect the dot image signal, through the fuzzy recognition of the shape of the AM dot, distinguish the shape of the AM dot, extract the edge signal and shape information of the AM dot, and demodulate the AM dot The shape information of the screen dots, output a 16-bit binary modulation signal. Perform channel decoding on the 16-bit binary modulated signal output by demodulation, generate a 16-bit binary decryption anti-counterfeiting information table after channel decoding, record the 16-bit binary information in the binary decryption anti-counterfeiting information table as H _i , pass It can be seen from the encryption process that when the operator control variable k=0 When the operator control variable k=1 When the operator control variable k=2 When the operator control variable k=3 The initial value of the position control variable of 16 binary information H _i in the binary decryption anti-counterfeiting information table is set as i=1, from the first group H ₁ in the binary decryption anti-counterfeiting information table, to each group in the binary decryption anti-counterfeiting information table 16-bit binary information carried Decryption operation, solve the binary anti-counterfeiting information N _i , generate a 16-bit binary anti-counterfeiting information table whose upper 8 bits are all 0, remove the upper 8 bits, generate an 8-bit binary anti-counterfeiting information table, restore the anti-counterfeiting signal and output the anti-counterfeiting information.

Claims (1)

1. A binary anti-counterfeiting printing method that generates binary modulation signals through encryption operations and channel coding for anti-counterfeiting information, and embeds anti-counterfeiting information in the entire page by means of cyclic look-up modulation. The binary anti-counterfeiting printing method is characterized in that: The anti-counterfeiting information is digitized to generate an 8-bit binary anti-counterfeiting information table. The anti-counterfeiting information is image information and text information. In order to prevent information overflow during the encryption process, the 8-bit binary information in the binary anti-counterfeiting information table is expanded to 16 A set of binary information, generate a 16-bit binary anti-counterfeiting information table with all 0s in the upper 8 bits, record the i-th group of 16-bit binary information in the 16-bit binary anti-counterfeiting information table as N _i , where i is greater than 0 The positive integer of the eight-bit binary encryption parameter is denoted as C, the encryption parameter C is an integer of 0≦C﹤256, the control variable of a two-digit binary operator is denoted as k, and the operator control variable k is an integer of 0≦k≦3. operator Using +, ×, -, ÷ four operators, operator control variable k = 0 They are respectively defined as "+", "×", "-", "÷" operations, when the operator control variable k=1 They are respectively defined as "-", "×", "+", "÷" operations, when the operator control variable k=2 They are respectively defined as "-", "÷", "+", "×" operations, when the operator control variable k=3 They are respectively defined as "÷", "-", "×", and "+" operations, and when the operator control variable k=0, the encryption operation is defined as When the operator control variable k=1, the encryption operation is defined as When the operator control variable k=2, the encryption operation is defined as When the operator control variable k=3, the encryption operation is defined as The initial value of setting encryption parameter C, the initial value k=0 of setting operator control variable k, the position control variable i=1 of 16 binary information N _i of setting 16 groups of binary anti-counterfeiting information tables, from 16 Starting with the first group of 16-bit binary information N ₁ in a set of binary anti-counterfeiting information tables, the 16-bit binary information in the binary anti-counterfeiting information table is encrypted using the above four different encryption calculation formulas in a loop, and at each encryption operation Carry out i+1 and k+1 operations at the same time, as the values of i and k change, by encrypting each group of 16-bit binary information in the 16-bit binary anti-counterfeiting information table, a 16-bit group of anti-counterfeiting information is generated Binary encryption anti-counterfeiting information table, the shape of AM dots is set to two types: and in Defined as the number 0, Defined as the number 1, use the generated 16-bit binary encrypted anti-counterfeiting information to undergo channel coding to generate a 16-bit binary modulation signal with error detection and error correction functions, and rasterize the original continuous tone image signal and Hybrid screen output halftone mixed screen image signal, including amplitude modulation dot and frequency modulation dot image signal, use the generated 16-bit binary modulation signal to modulate the amplitude modulation dot in the halftone mixed screen image signal by means of circular look-up table modulation shape, so that the shape of the AM dot follows the and Changes occur regularly, so that the adjacent 16 AM dots in the halftone mixed screen image signal carry 16-bit binary encrypted anti-counterfeiting information through shape changes, thereby generating a halftone mixed screen image with anti-counterfeiting information embedded in the entire page dots Signal, to achieve anti-counterfeiting printing.