CN102945423B - Single-parameter displacement variable-sequence encrypted binary anti-counterfeiting printing method - Google Patents

Abstract

A binary anti-counterfeiting printing method with single-parameter displacement sequence encryption, which can pass binary anti-counterfeiting information through Encryption operations and channel coding generate binary modulation signals, and the anti-counterfeiting information is embedded in the entire page in the orderly change of the shape of the amplitude modulation dots through the modulation method of the circular look-up method, and the anti-counterfeiting information can be identified from any fragment when identifying printed matter. It can be widely used in the anti-counterfeiting field of printed matter.

Description

Binary Anti-counterfeiting Printing Method of Single-parameter Displacement and Sequence Encryption

Technical field:

The invention relates to an anti-counterfeiting printing technology, in particular to a binary anti-counterfeiting printing technology of single-parameter displacement sequence encryption, 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 in the query, that is, the presence or absence of phenomena in the grid, and then forges them in batches according to this characteristic. In summary, 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 image information, text information, trademark information and other anti-counterfeiting information to generate 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 to 16-bit binary information, and a 16-bit binary anti-counterfeiting information with all 0s in the upper 8 bits is generated Table, 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-bit binary encryption parameter is recorded as C, and the encryption parameter C is 1≦C≦ An integer of 255, the two-digit binary operator control variable is recorded as k, and the operator control variable k is an integer of 0≦k≦3, and the operators @ ¹ _k , @ ² _k , @ ³ _k , and @ ⁴ _k use +, × , -, ÷ four operators, when the operator control variable k = 0, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k are respectively defined as "+", "×", "-", "÷" Operation, when the operator control variable k=1, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k are respectively defined as "-", "×", "+", and "÷" operations, and the operator control variable k= At 2, @ ¹ _k , @ ² _k , @ ³ _k and @ ⁴ _k are respectively defined as "-", "÷", "+" and "×" operations, and when the operator control variable k=3, @ ¹ _k , @ ² _k , ＠ ³ _k , ＠ ⁴ _k are defined as “÷”, “－”, “×” and “+” operations respectively. 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 the first group of binary anti-counterfeiting information table, carry out each group of 16-bit binary information in the 16-bit group of binary anti-counterfeiting information table Encryption operation, and each set of 16-bit binary information Perform i+1 and k+1 operations at the same time as the encryption operation, so that the next operation points to Among them, both i and k have increased by 1, and each set of 16-bit binary information in the 16-bit set of binary anti-counterfeiting information table is carried out Encryption operation, generate a 16-bit binary encrypted anti-counterfeiting information table, the shape of the AM dots is set to two types: □ and ◇, where □ is defined as the number 0, ◇ is defined as the number 1, using the generated 16-bit binary The encrypted anti-counterfeiting information modulates the AM dots through the circular look-up method, so that the shape of the AM dots in the mixed screen can be changed regularly according to the shapes 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 outlets form a set of 16-bit binary information, which makes it carry anti-counterfeiting information and embeds the anti-counterfeiting information in the entire page outlets, which can more effectively combat illegal copying based on cameras, scanners, and electronic documents. Behavior. 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 digitized at first, and a binary anti-counterfeiting information table of 8 bits is generated. The anti-counterfeiting information can be image information, text information, trademark information, etc. The binary information is expanded into a group of 16 binary information, and a 16-bit binary anti-counterfeiting information table with all 0s in the upper 8 bits is generated, and each group of 16-bit binary information in the 16-bit binary anti-counterfeiting information table is processed 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, etc., and the original continuous modulation image signal is rasterized (RIP) and mixed and screened to output a halftone mixed screened image signal, including amplitude modulation dots and The FM dot image signal uses the generated 16-bit binary modulation signal to modulate the shape of the AM dot in the mixed screen image signal by means of a circular look-up table modulation method, so that the shape of the AM dot changes according to □ and ◇ regularly, so that The 16 adjacent AM dots in the mixed screened image signal carry 16-bit binary anti-counterfeiting information through shape changes, thereby generating a mixed screened image signal with anti-counterfeiting 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 The encryption process shows 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-counterfeit information table is set as i=1, from the first group of 16 binary information in the binary decryption anti-counterfeit information table, to each in the binary decryption anti-counterfeit information table A set of 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 ways

In flow chart 1 of loading anti-counterfeiting information, the original anti-counterfeiting information (image, text, trademark) 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 One set of 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 greater than 0 Positive integer, the eight-digit binary encryption parameter is denoted as C, the encryption parameter C is an integer of 1≦C≦255, the two-digit binary operator control variable is denoted as k, and the operator control variable k is an integer of 0≦k≦3. The symbols ＠ ¹ _k , ＠ ² _k , ＠ ³ _k , ＠ ⁴ _k adopt +, ×, -, ÷ four operators, and when the operator control variable k＝0, ＠ ¹ _k , ＠ ² _k , ＠ ³ _k , ＠ ⁴ _k are respectively defined as "+", "×", "-" and "÷" operations, and when the operator control variable k=1, @ ¹ _k , @ ² _k , @ ³ _k and @ ⁴ _k are respectively defined as "- """×","+","÷" operations, when the operator control variable k=2, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k are respectively defined as "-", "÷", "+ ", "×" operation, when the operator control variable k=3, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k are respectively defined as "÷", "-", "×", "+" operations, 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 in setting 16 groups of binary anti-counterfeiting information table, from 16 Start with the first group of 16-bit binary information N ₁ in a group of binary anti-counterfeiting information table, and carry out each group of 16-bit binary information in the 16-bit group of binary anti-counterfeiting information table Encryption operation, and each set of 16-bit binary information Perform i+1 and k+1 operations at the same time as the encryption operation, so that the next operation points to Among them, both i and k have increased by 1, and each set of 16-bit binary information in the 16-bit set of binary anti-counterfeiting information table is carried out Encryption operation to generate a 16-bit binary encrypted anti-counterfeiting information table. The shape of the AM dots is set to two types: □ and ◇, where □ is defined as the number 0 and ◇ is defined as the number 1. The generated 16-bit binary encrypted anti-counterfeiting information is passed through Channel coding, which generates a binary modulated signal with error detection and correction functions. Channel coding can adopt various forms such as cyclic coding, convolutional coding or Turbo coding. The original continuous tone image signal is rasterized (RIP) 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 mixed screen image signal embedded with anti-counterfeiting information. Through the circular look-up table modulation method, the adjacent 16-bit AM dots can generate a set of 16-bit binary data through shape changes, so that they carry anti-counterfeiting information, and the anti-counterfeiting information is embedded 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 The encryption process shows 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-counterfeit information table is set as i=1, from the first group of 16 binary information in the binary decryption anti-counterfeit information table, to each in the binary decryption anti-counterfeit information table A set of 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. anti-counterfeiting information is generated binary modulated signal by cryptographic calculation and chnnel coding by one kind, and the modulation system Single-parameter displacement be embedded in by anti-counterfeiting information in full page of tabling look-up by circulating becomes sequence encrypted binary antiforging printing method, it is characterized in that: digitizing is carried out to anti-counterfeiting information, generate the scale-of-two anti-counterfeiting information table of 8 group, anti-counterfeiting information is image information, Word message or trademark information, for preventing producing information spillover in ciphering process, in scale-of-two anti-counterfeiting information table 8 one group of binary message is expanded to 16 one group of binary messages, generate 16 the one group scale-of-two anti-counterfeiting information table that most-significant byte is 0 entirely, i-th group of 16 binary message in 16 one group scale-of-two anti-counterfeiting information table are denoted as N _i, i be greater than 0 positive integer, eight-digit binary number encryption parameter is denoted as C, and encryption parameter C is the integer of 1≤C≤255, and two binary operator control variable are denoted as k, and operator control variable k is the integer of 0≤k≤3, operator@ ¹ _k,@ ² _k,@ ³ _k,@ ⁴ _kadopt+, × ,-, ÷ tetra-kinds of operators ,@during operator control variable k=0 ¹ _k,@ ² _k,@ ³ _k,@ ⁴ _kbe defined as respectively "+", "×", "-", " ÷ " computing ,@during operator control variable k=1 ¹ _k,@ ² _k,@ ³ _k,@ ⁴ _kbe defined as respectively "-" "×", "+", " ÷ " computing ,@during operator control variable k=2 ¹ _k,@ ² _k,@ ³ _k,@ ⁴ _kbe defined as "-", " ÷ ", "+", "×" computing respectively ,@during operator control variable k=3 ¹ _k,@ ² _k,@ ³ _k,@ ⁴ _kbe defined as " ÷ ", "-", "×", "+" computing respectively, during operator control variable k=0, cryptographic calculation is defined as [(C@ ¹ _k(C+k))+(N _i@ ² _k(C+k))+(N _i@ ³ _k(C+k))+(N _i@ ⁴ _k(C+k))], during operator control variable k=1, cryptographic calculation is defined as [(N _i@ ¹ _k(C+k))+(C@ ² _k(C+k))+(N _i@ ³ _k(C+k))+(N _i@ ⁴ _k(C+k))], during operator control variable k=2, cryptographic calculation is defined as [(N _i@ ¹ _k(C+k))+(N _i@ ² _k(C+k))+(C@ ³ _k(C+k))+(N _i@ ⁴ _k(C+k))], during operator control variable k=3, cryptographic calculation is defined as [(N _i@ ¹ _k(C+k))+(N _i@ ² _k(C+k))+(N _i@ ³ _k(C+k))+(C@ ⁴ _k(C+k))], the initial value of setting encryption parameter C, the initial value k=0 of setting operator control variable k, sets 16 binary message N in 16 one group scale-of-two anti-counterfeiting information table _iposition control variable i=1, from 16 one group scale-of-two anti-counterfeiting information table first group of 16 binary message, in 16 one group scale-of-two anti-counterfeiting information table each group 16 binary messages carry out [(C@ ¹ _k(C+k))+(N _i@ ² _k(C+k))+(N _i@ ³ _k(C+k))+(N _i@ ⁴ _k(C+k))] cryptographic calculation, and [(C@is being carried out to each group 16 binary messages ¹ _k(C+k))+(N _i@ ² _k(C+k))+(N _i@ ³ _k(C+k))+(N _i@ ⁴ _k(C+k))] carry out i+1 and k+1 computing while cryptographic calculation, make next computing point to [(N _i@ ¹ _k(C+k))+(C@ ² _k(C+k))+(N _i@ ³ _k(C+k))+(N _i@ ⁴ _k(C+k))] wherein i and k both increases 1, by carrying out each group 16 binary messages in 16 one group scale-of-two anti-counterfeiting information table

[(C@ ¹ _k(C+k))+(N _i@ ² _k(C+k))+(N _i@ ³ _k(C+k))+(N ⁱ@ ⁴ _k(C+k))] cryptographic calculation, generate the scale-of-two encryption anti-fake information table of 16 group, the shape of amplitude is set to two kinds: with , wherein be defined as numeral 0, be defined as numeral 1, utilize the scale-of-two encryption anti-fake information of 16 group generated through chnnel coding, generate 16 one group of binary modulated signals with error detecting and error correcting function, image signal of original continuous being changed the line map exports shadow tone hybrid screening picture signal through rasterizing process (RIP) and hybrid screening, comprising amplitude and FM screened image signal, utilize 16 the one group of binary modulated signals generated to adopt the shape of amplitude in circulation look-up table modulation systems modulation hybrid screening picture signals, make the shape of amplitude according to with regularly to change, adjacent 16 amplitudes in hybrid screening picture signal are made to carry 16 scale-of-two encryption anti-fake information by the change of shape, thus be created on the hybrid screening picture signal embedding anti-counterfeiting information in full page site, realize anti-counterfeit printing.