CN102945469B - Double-variant two-dimensional encryption binary anti-counterfeiting printing method - Google Patents

Abstract

The invention discloses a double-variant two-dimensional encryption binary anti-counterfeiting printing method which comprises the following steps: performing encrypting operation and channel encoding to binary anti-counterfeiting information to generate a binary modulating signal, and adopting a modulation mode of a looped look-up table method to embed the anti-counterfeiting information into the whole page through sequential change in a shape of amplitude-modulated dot. Therefore, the anti-counterfeiting information can be recognized from any fragment during presswork recognition. The method can be widely applied to the anti-counterfeiting field of presswork.

Description

Double-variable two-dimensional encrypted binary anti-counterfeiting printing method

Technical field:

The invention relates to an anti-counterfeiting printing technology, in particular to a double-variable two-dimensional 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 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 binary operator control variable is recorded as k, and the operator control variable k is 0≦ An integer of k≦3, an eight-bit control variable is recorded as j, and the control variable j is an integer of 0≦j≦256, and the operators are @ ¹ _{k ,} @ ² _k , @ ³ k , @ ⁴ _k , @ ⁵ _k , @ ⁶ _k adopts four operators +, -, ×, ÷, when the operator control variable k=0, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k , @ ⁵ _k , @ ⁶ _k are respectively defined as +, ×, -, ÷, +, ÷, when the operator control variable k = 1, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k , @ ⁵ _k , @ ⁶ _k are respectively defined as +, ÷, -, ×, +, ÷, when the operator control variable k=2, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k , @ ⁵ _k , @ ⁶ _k are respectively defined as -, ÷, +, ×, +, ÷, when the operator control variable k=3, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k , @ ⁵ _k , and @ ⁶ _k are respectively defined as +, ×, +, ÷, -, ÷, set The initial value j=0 and k=0 of operator control variable j and k, the position control variable i=1 of 16 binary information N _i in setting 16 groups of binary anti-counterfeiting information tables, from 16 groups of binary anti-counterfeiting Starting with the first 16-bit binary information N ₁ in the information table, perform [(N _i ¹ _k (j+k+1) ² _k (j+ k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6) ] encryption operation, and [(N _i ¹ _k (j+k+1) ² _k (j+k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6)] Encryption operations are performed simultaneously with i+1, j+1 and k+1 operations , so that the next operation points to [(N _i ¹ _k (j+k+1) ² _k (j+k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4 ))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6)] wherein i, j and k are all increased by 1, by performing [ (N _i ¹ _k (j+k+1) ² _k (j+k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6)] 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, Defined as the number 1, use the generated 16-bit binary encrypted anti-counterfeiting information to modulate the AM dots through the circular look-up table method, so that it can change the shape of the AM dots in the hybrid screen regularly according to the shape of the above two AM dots, so that The shape of the AM dots in the hybrid screen changes regularly. After modulation, 16 adjacent AM dots 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 dots, which can be more Effectively fight against illegal copying based on cameras, scanners, electronic documents, etc. 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 16-bit group of binary information, and a 16-bit group of binary anti-counterfeiting information table whose upper 8 bits are all 0 is generated, and [(N _i ¹ _k (j+k+1) ² _k (j+k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4))+(N _i ⁵ _k (j +k+5) ⁶ _k (j+k+6)] encryption operation to generate a 16-bit binary encrypted anti-counterfeiting information table, and use the 16-bit binary information in the generated 16-bit binary encrypted anti-counterfeiting information table to pass through the channel Coding, generating a group of 16 binary modulation signals with error detection and error correction functions. Channel coding can adopt various forms such as cyclic coding, convolution coding or Turbo coding, and the original continuous tone image signal is processed through rasterization ( RIP) and mixed screen output halftone mixed screen image signal, including amplitude modulation dot and frequency modulation dot image signal, using the generated 16-bit binary modulation signal to modulate the amplitude modulation in the mixed screen image signal by using the circular look-up table modulation method The shape of the dots, so that the shape of the AM dots follows □ and Changes occur regularly, so that the adjacent 16 AM dots in the mixed screen image signal carry 16-bit binary anti-counterfeiting information through shape changes, thereby generating a mixed screen 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 H _i = [(N _i ¹ _k (j+k+1) ² _k (j+k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4 ))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6)], the initial value of the position control variable of 16 binary information Hi in the binary decryption anti-counterfeiting information table is set as i=1, Starting from the first _H1 in the binary decryption anti-counterfeiting information table, H _i =[(N _i ¹ _k (j+k+1) ² _k (j+ k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6) ] 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 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, binary operator control variable is denoted as k, operator control variable k is an integer of 0≦k≦3, eight-bit control variable is denoted as j, control variable j is an integer of 0≦j≦256, operator@ ¹ _k , ＠ ² _k , ＠ ³ _k , ＠ ⁴ _k , ＠ ⁵ _k , ＠ ⁶ _k adopt +, -, ×, ÷ four operators, when the operator control variable k＝0, ＠ ¹ _k , ＠ ² _k , @ ³ _k , @ ⁴ _k , @ ⁵ _k , @ ⁶ _k are respectively defined as +, ×, -, ÷, +, ÷, when the operator control variable k=1, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k , @ ⁵ _k , @ ⁶ _k are respectively defined as +, ÷, -, ×, +, ÷, when the operator control variable k=2, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k , @ ⁵ _k , @ ⁶ _k are respectively defined as -, ÷, +, ×, +, ÷, when the operator control variable k=3, @ ¹ _k , @ ² _k , @ ³ _k , @ ⁴ _k , @ ⁵ _k , @ ⁶ _k are defined as +, ×, +, ÷, -, ÷ respectively, set the initial values j=0 and k=0 of the operator control variables j and k, and set 16 in the 16-bit binary anti-counterfeiting information table The position control variable i=1 of bit binary information N _i starts from the first 16-bit binary information N ₁ in a group of 16 binary anti-counterfeiting information tables, to each 16-bit binary information in a group of 16 binary anti-counterfeiting information tables Information proceeds [(N _i ¹ _k (j+k+1) ² _k (j+k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4))+( N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6)] encryption operation, and [(N _i ¹ _k (j+k+1) ² _k ( j+k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+ 6)] Perform i+1, j+1 and k+1 operations at the same time as the encryption operation, so that the next operation points to [(N _i ¹ _k (j+k+1) ² _k (j+k+2))+ (N _i ³ _k (j+k+3) ⁴ _k (j+k+4))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6)] where i, j and k has been increased by 1, by a 16-bit binary [(N _i ¹ _k (j+k+1) ² _k (j+k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6)] encryption operation to generate a 16-bit binary encrypted anti-counterfeiting information table, the The shape is set to two types: □ and where □ is defined as the number 0, Defined as the number 1, the generated 16-bit binary encrypted anti-counterfeiting information undergoes channel coding to generate a binary modulated signal with error detection and error 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. Using the generated binary modulation signal, the shape of the AM dots in the hybrid screened image signal is modulated by the circular look-up table modulation method, so that the shape of the AM dots in the hybrid screened is changed regularly, and a hybrid screened image signal embedded with anti-counterfeiting information is generated. Through the circular look-up table modulation method, the adjacent 16-bit AM dots can generate a 16-bit binary data through shape changes, so that they can carry anti-counterfeiting information, and the anti-counterfeiting information can be 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 H _i = [(N _i ¹ _k (j+k+1) ² _k (j+k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4 ))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6)], the initial value of the position control variable of the 16-bit binary information H _i in the binary decryption anti-counterfeiting information table is set as i=1 , starting from the first H ₁ in the binary decryption anti-counterfeiting information table, H _i =[(N _i ¹ _k (j+k+1) ² _k (j +k+2))+(N _i ³ _k (j+k+3) ⁴ _k (j+k+4))+(N _i ⁵ _k (j+k+5) ⁶ _k (j+k+6 )] 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 anti-counterfeiting information.

Claims (1)

1. anti-counterfeiting information is generated binary modulated signal by cryptographic calculation and chnnel coding by one kind, and anti-counterfeiting information is embedded in the Double-variant two-dimensional encrypted binary antiforging printing method in full page by modulation system of tabling look-up by circulating, 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, binary operator control variable is denoted as k, and operator control variable k is the integer of 0≤k≤3, and eight control variable are denoted as j, and control variable j is the integer of 0≤j≤256, operator@ ¹ _k,@ ² _k,@ ³ _k,@ ⁴ _k,@ ⁵ _k,@ ⁶ _kadopt+,-, ×, ÷ tetra-kinds of operators ,@during operator control variable k=0 ¹ _k,@ ² _k,@ ³ _k,@ ⁴ _k,@ ⁵ _k,@ ⁶ _kbe defined as respectively+, × ,-, ÷ ,+, ÷ ,@during operator control variable k=1 ¹ _k,@ ² _k,@ ³ _k,@ ⁴ _k,@ ⁵ _k,@ ⁶ _kbe defined as respectively+, ÷ ,-, × ,+, ÷ ,@during operator control variable k=2 ¹ _k,@ ² _k,@ ³ _k,@ ⁴ _k,@ ⁵ _k,@ ⁶ _kbe defined as respectively-, ÷ ,+, × ,+, ÷ ,@during operator control variable k=3 ¹ _k,@ ² _k,@ ³ _k,@ ⁴ _k,@ ⁵ _k,@ ⁶ _kbe defined as respectively+, × ,+, ÷ ,-, ÷, setting operator control variable j and k initial value j=0 and k=0, set 16 binary message N in 16 one group scale-of-two anti-counterfeiting information table _iposition control variable i=1, first 16 binary message N from 16 one group scale-of-two anti-counterfeiting information table ₁start, [(N is carried out to each 16 binary message in 16 one group scale-of-two anti-counterfeiting information table ₁@ ¹ _k(j+k+1)@ ² _k(j+k+2))+(N ₁@ ³ _k(j+k+3)@ ⁴ _k(j+k+4))+(N ₁@ ⁵ _k(j+k+5)@ ⁶ _k(j+k+6)] cryptographic calculation, and [(N is being carried out to each 16 binary message ₁@ ¹ _k(j+k+1)@ ² _k(j+k+2)+(N ₁@ ³ _k(j+k+3)@ ⁴ _k(j+k+4))+(N ₁@ ⁵ _k(j+k+5)@ ⁶ _k(j+k+6)] carry out i+1, j+1 and k+1 computing while cryptographic calculation, make next computing point to [(N ₁@ ¹ _k(j+k+1)@ ² _k(j+k+2))+(N ₁@ ³ _k(j+k+3)@ ⁴ _k(j+k+4))+(N ₁@ ⁵ _k(j+k+5)@ ⁶ _k(j+k+6)] wherein i, j and k both increase 1, by carrying out [(N to each 16 binary message in 16 one group scale-of-two anti-counterfeiting information table ₁@ ¹ _k(j+k+1)@ ² _k(j+k+2))+(N ₁@ ³ _k(j+k+3)@ ⁴ _k(j+k+4))+(N ₁@ ⁵ _k(j+k+5)@ ⁶ _k(j+k+6)] cryptographic calculation, generates the scale-of-two encryption anti-fake information table of 16 group, the shape of amplitude be set to two kinds: and , 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 and 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.