EA006012B1 - Protection system of authenticity of printed information carrier - Google Patents

Abstract

The system is based on a method of printed information carrier authenticity provided with visually perceptive primary text and/or image, characterized in that an authenticity marker is applied on printed information carrier which is preformed by calculating function from the primary text and/or the image which have been applied on said printed information carrier, and a secret parameter known only to a person who forms the authenticity marker, after which the authenticity marker is read and a secondary text and/or image is restored the secondary document text and/or and the primary and second texts and/or images and on the basis of comparison verify the authenticity of the printed information carrier.

Description

Under the system of protection of the authenticity of the print medium, the applicant within the framework of this patent application means:

a method for protecting the authenticity of a printed information medium provided with visually perceptible primary text and / or image;

a method and apparatus for generating a document constituting a printed information medium and provided with a visually perceptible primary text and / or image, with a marker of authenticity;

a method and apparatus for monitoring the invariability of the primary text on a printed information medium by analyzing an authenticity marker generated on this printed information medium;

a print medium equipped with a visually perceptible primary text and / or image and containing a marker of authenticity.

Currently, due to the rapid development of copying and duplication equipment, capable of reproducing in detail the attributes of paper or other documents, there is an acute problem of protecting the authenticity of documents. For example, quite often there are cases of falsification of transport travel documents when a document is falsified by making a high-quality color copy. In addition, there are frequent cases of falsification of documents containing personal data by editing the attributes of the document (photos, name and / or surname of the owner of the document or other parameters, such as the expiration date of the document, etc.) in a graphical editor.

The problem of verifying the authenticity of a document confronts us as follows: an authorized person draws up a document containing critical information (person’s settings, address parameters, money, etc.). The critical information mentioned can be changed intentionally (for example, another person will be indicated by the owner of the property) or by accident (damage to the document, missing letters, etc.). It is necessary to provide the document with some protective sign, which allows you to verify the invariance of the document over time, and also indicate that the document has been amended and which ones.

So, for example, security marks are now being introduced into banknotes and checks, which are made in the form of watermarks on a paper basis of a document or using magnetic wire, completely or with gaps hidden in the paper shell of this document, and the wire may have additional encoding. Such documents are well adapted to automated controls designed to detect the presence of watermarks or magnetic wire in a passing document. In addition, holographic or other hard-copy stickers are used to authenticate.

Thus, numerous security signs are currently used to determine the authenticity of documents, but these signs do not contain any information about the content of the text of the document. For example, it is possible to re-stick topographic labels on another document or remove magnetic wire from banknotes of lesser denomination and move them to banknotes of greater denomination. In addition, the use of special paper, protective wire or topographic marks is quite expensive and is applicable only for a narrow class of documents.

The specialist in this field, however, encounters great difficulties trying to combine various security signs, on the one hand, because the analysis technology is quite complicated and requires the use of various sensors, often bulky and poorly compatible with each other, and, on the other hand, because decisions made often depend on the safety and orientation of this document. In addition, the machines used for recognition, sorting, counting and / or distribution are being improved to increase their productivity, as well as general purpose document readers (scanners) are the basis of these machines.

This explains the fact that specialists usually limited themselves to the use of safety signs of only one type, depending on the ultimate goal (in particular, to determine the authenticity or dignity of bank tickets).

The closest to the present invention both in terms of the task and the achieved result are the method and device for checking banknotes according to French patent No. 2370327, which discloses a method and device, the operation of which is based on the fact that the analyzed document is read by several photosensors, and the resulting signal after processing is compared with a threshold value. However, according to this method and by means of the described device, two fundamental problems for the consumer are not solved, namely:

1. The described device checks only the presence and optical properties of the printed characters printed on the medium, but the content of the printed document is not controlled.

2. To implement the method, an expensive special device is used, while most consumers want to use a cheaper solution implemented on general-purpose equipment (scanners and printers, including household or mobile devices of poor quality scanning and printing).

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Thus, at present, there is a need to improve the known methods for determining the authenticity of documents in order to combat the increasingly sophisticated technology of falsification of these documents.

The present invention is based on the task of creating a system based on a method of protecting the authenticity of a printed information medium equipped with a visually perceptible primary text and / or image, which provides automated detection of fake documents with a high degree of reliability of the verification result.

Another objective of the present invention is to develop a method and a device for forming a document, which is a print medium and equipped with a visually perceptible primary text and / or image with a marker of authenticity, which subsequently would verify the authenticity of the document.

The next objective of the present invention is to develop a method and create a device for monitoring the invariability of the primary text on the print medium by analyzing the authenticity marker generated on this print medium, thereby making a conclusion about the authenticity of the print medium with a high degree of reliability.

And another objective of the present invention is the creation of a document - a carrier of printed information, equipped with a visually perceptible primary text and / or image, which has a high degree of resistance to forgery.

The task of creating a method of protecting the authenticity of a printed information medium equipped with a visually perceptible primary text and / or image, which provides automated detection of fake documents with a high degree of reliability of the verification result, is solved by the fact that an authenticity marker is applied to the printed information medium, which is preliminarily formed by calculating the function of primary text and / or image printed on said print medium and a secret parameter known only to the person forming the authenticity marker, as a result of which a print medium equipped with an authenticity marker is obtained, after which the authenticity marker is read and the secondary text of the document and / or image is restored from the read information, after which the primary and secondary texts and / or images are compared to Based on the comparison, they conclude that the print medium is genuine.

The task of developing a method of forming a document that is a medium of printed information and equipped with a visually perceptible primary text and / or image, with an authenticity marker, which subsequently would verify the authenticity of the document, is solved by the fact that the authenticity marker is formed by calculating the function of the primary text and / or an image printed on said print medium and a secret parameter known only to the person forming the authenticity marker, and then formed anny authentication token applied to the document.

The task of creating a document forming device, which is a print medium and equipped with a visually perceptible primary text and / or image, with an authenticity marker, which subsequently would verify the authenticity of the document, is implemented in a device containing a reader for a printed information medium equipped with visually perceptible primary text and / or image; an authenticity marker forming unit, the first input of which is communicated with the output of said means for reading print media; a secret parameter storage unit, the output of which is communicated with the second input of the authenticity marker generation unit; and a unit for applying an authenticity marker on a recording medium, the input of which is communicated with the output, an authenticity marker forming unit.

The task of developing a method for controlling the invariability of the primary text on the printed information medium by analyzing the authenticity marker generated on this printed information medium, whereby the conclusion is made about the authenticity of the printed information medium with a high degree of reliability, has been solved due to the fact that the authenticity marker is read, and the secondary text of the document and / or image is restored from the read information, after which the primary and secondary texts and / or images are compared and based on comparison I conclude the authenticity of the print medium.

The task of creating a device for monitoring the invariability of the primary text on the printed information medium by analyzing the authenticity marker generated on this printed information medium, thereby concluding that the printed information medium is authentic with a high degree of reliability, has been solved in a device containing means for reading the authenticity marker from the medium printed information; an authenticity marker control unit, the input of which is communicated with the output of said authenticity marker reader; a secondary text recovery unit from an authenticity token, the input of which is communicated with the output of said authenticity token control unit.

The task of creating a document - a carrier of printed information equipped with a visually perceptible primary text and / or image with a high degree of resistance to fake, is implemented in a printed information medium equipped with a visually perceived primary

- 2 006012 text and / or image and containing an authenticity marker, which is preliminarily formed by calculating a function of the primary text and / or image printed on said print medium and a secret parameter known only to the person forming the authenticity marker.

Let us examine in detail the method of forming a document - a carrier of printed information equipped with a marker of authenticity, using the example of a power of attorney for a document defining the trust of rights to perform actions or possess property by one person on behalf of another. A power of attorney is a text document containing the name of the principal (the one who trusts), the name of the authorized person (to whom the rights are entrusted), the subject of the power of attorney (for which it was issued, for example, to drive a vehicle), the duration of the power of attorney and the name of the person who made the power of attorney (notary )

In this case, it is important that the authorized bodies (tax or law enforcement agencies) can make sure that all attributes of the power of attorney remain unchanged throughout its validity period, i.e. whether the name of the proxy, the parameters (license plates) of the vehicle, the period of validity of the power of attorney and the name of the notary have been changed.

Thus, the notary forms the text of the document, entering it from standard input means, for example, typing on the computer keyboard, we designate the typed primary text in binary form as M. It is also possible that the notary has scanned the primary text already printed on paper.

It is also important that the notary has a secret parameter (password) for calculating the mentioned function of the primary text and the secret parameter x: 0 <x <s. |.

Then the authenticity marker for the primary text M is generated as follows:

1. 1 (M) is calculated - the value of the hash function 11 from the message M; if 1 (M) (tob with |) = 0, then 1 (M) is assigned the value 0 ²⁵⁵ 1 (bit sequence consisting of 255 zeros and one unit bit);

2. a random integer 1 <: 0 <к <с | is generated;

3. Two values are calculated:

r = a ^k (tob r) and r '- r (tob φ;

if r '= 0, go to step 2 and work out another value of the number k;

using the secret key x of the notary, we calculate the value 8 = (xr '+ k1 (M)) (tob with |); if 8 = 0, go to step 2, otherwise we end the algorithm.

The authenticity marker of the primary text M is a string of bits <M> || <r '> ₂₅₆ || <8> ₂₅₆ . The following notation is used:

a = b (tobn) - the integers a and b have the same residues when dividing entirely by the natural number n (they say that the numbers a and b are comparable modulo n);

a (tob n) is the remainder of dividing the number a by the number n;

<8> n is a string of length n bits containing a binary notation of the number 8;

| A | - the length of the string of bits A;

A || B is the concatenation of bit strings A and B (a string of length | A | + | B | bits, in which the left | A | characters form the string A, and the right | B | characters form the string B).

As a hash function 1, it is useful to use the hash function of the Russian standard GOST R 34.11-94 or another hash function described by the international standard, for example, 8NA1.

The following are the parameters mentioned above:

prime number p: 2 ⁵⁰⁹ <p <2 ⁵¹² or 2 ¹⁰²⁰ <p <2 ¹⁰²⁴ ;

prime s. |: ^2,254 <s. | <2 ²⁵⁶ and s. | is a divisor of the number (p-1);

an integer a: 1 <a <p-1, while a ⁴ (tob p) = 1.

Further, the authenticity marker of the primary text calculated above is formed into a matrix of a two-dimensional bar code, for example, Oa1aMa1p.kh, and is printed on a paper sheet either together with the text M of the power of attorney, or applied to the already printed power of attorney on an empty sheet space. The two-dimensional bar code is a matrix of black and white squares, while black squares correspond to single bits, and white to zero.

Thus, a paper print medium is formed, equipped with a visually perceptible (readable) primary text of the power of attorney and containing a token of authenticity, which is formed by calculating the above function from the primary text of the power of attorney and a secret parameter known only to the notary who forms the authenticity token.

To describe the authentication process, we note that a parameter is being generated to verify the authentication token, which is the number y, calculated as follows:

y = a ^x (tob r).

The peculiarity of this parameter is that it is practically impossible to calculate the secret parameter x from the known y.

The procedure for controlling the invariability of the primary text on the print medium (power of attorney) is carried out by analyzing the authenticity marker, which is read from the power of attorney primarily in the form of a two-dimensional bar code from which the secondary text of document M1 is restored (decoded) and the pair < ^Г '> 256 II <§> 256.

To check the immutability of the text, M ₁ uses the public key y, the process includes the following steps:

1) check the conditions: 0 <§ <p. | and 0 <r '<s. |: if at least one of these conditions is not fulfilled, then the secondary text is considered non-authentic;

2) th (M ₁ ) is calculated - the value of the hash function 11 from the received message M ₁ ;

3) if 1 (M ₁ ) (the one with |) = 0, assign 1 (M ₁ ) to 0 ²⁵⁵ 1; calculate the value ν = (d (M1)) ^4-2 (toy with |): calculate the values ζ ₁ = §ν (toy with |) and ζ ₂ - (s. | - τ ') ν (toy with |): calculate the value u = (a ^ · yy (toy p)) (toy with |):

4) check the condition r '= u; if the condition is met, the secondary text is considered authentic, otherwise - not authentic ·

Next, you need to compare the secondary text M1 with the primary text read on the document (power of attorney) · If they are equal, the entire document is considered authentic. Comparison can be performed automatically by reading the source text and by letter-by-word comparison or manually comparing the restored text and the primary text located on the document

The invention is applicable to documents of any kind formed on any medium (paper, cardboard, fabric, metal foil, etc.), in particular to bank credit cards (banknotes) or to guarantee documents (powers of attorney, will) containing text and / or graphic picture.

It would be advisable that the function used to form the token of authenticity be unidirectional. This is due to the fact that the use of a unidirectional function makes it difficult to largely unauthorized determination of the secret parameter and, as a result of this, the possibility of falsifying a document is excluded.

It would be equally advisable to compress the digital representation of the primary text when calculating the function of forming an authenticity marker. This leads to a decrease in the volume of the authenticity marker and a reduction in the time required to generate, verify and read the authenticity marker, and to increase the informative volume of the document to be protected.

It would be no less reasonable if the consumer, when forming the marker of authenticity, used the function of calculating the electronic digital signature of the primary text. This would be consistent with the relevant national legislation of the country of the potential consumer and would allow to assess the degree of security of the document in the authorized national authorities.

It would be possible to embed an authenticity marker in the primary text, due to which additional places in the document are not used, as a rule, we are talking about document fields. This is important for a certain category of documents having a formalized and standardized structure, for example, this is important for payment orders.

However, it is also possible that the marker of authenticity is applied to the print medium by sticking it. This is necessary if there is a possibility of damage to the document when it passes through the printing device.

It should be noted that a very common situation is possible in which the formation of a document takes place geographically in a different place than the verification of its authenticity, for example, a car maintenance ticket is generated once in the state bodies of road technical inspection, and checked repeatedly in various places and throughout the term coupon actions. In connection with this situation, the applicant proposes, on the one hand, a method for generating a document that is a printed information medium and provided with a visually perceptible primary text and / or image, with an authenticity marker and, on the other hand, a method for controlling the invariability of the primary text on a printed medium information by analyzing the authenticity marker generated on this print medium.

A method of generating a document that is a printed information medium and provided with a visually perceptible primary text and / or image with an authenticity marker is that an authenticity marker is formed by calculating a function of the primary text and / or image printed on said printed information medium, and a secret parameter known only to the person forming the authenticity marker, after which the generated authenticity marker is applied to the document. And the way to control the invariability of the primary text on the print medium by analyzing the authenticity marker generated on this print medium is that the authenticity marker is read and the secondary text of the document and / or image is restored from the read information, after which the primary and secondary texts and / or images are compared and based on the comparison, a conclusion is made about the authenticity of the print medium. It should be noted that the control method disclosed here is intended to determine the authenticity of documents formed by the document generation method disclosed above in this paragraph of the description. Disclosed here are methods of formation

- 4 006012 of the document and the implementation of control are components of the disclosed in great detail when describing a method of protecting the authenticity of a printed information medium provided with a visually perceptible primary text and / or image, in this regard, the applicant believes that it is not necessary to repeat the detailed disclosure of these methods.

Next, the applicant will dwell in more detail on devices that practice the described methods, and a print medium equipped with a visually perceptible primary text and / or image and containing an authenticity marker, with reference to the accompanying drawings, in which FIG. 1 discloses a schematic block diagram of a document forming apparatus, which is a printed information medium and provided with a visually perceptible primary text and / or image, with a marker of authenticity;

FIG. 2 discloses a basic block diagram of a device for monitoring the invariability of primary text on a printed information medium by analyzing an authenticity marker generated on this printed information medium, a basic version;

FIG. 3 discloses a schematic block diagram of a device for monitoring the invariability of primary text on a print medium by analyzing an authenticity marker generated on this print medium, a modified version;

FIG. 4 shows a recording medium provided with a visually perceptible primary text and / or image and containing a marker of authenticity.

In FIG. 1 is a schematic block diagram of a document forming apparatus, which is a printed information medium and provided with a visually perceptible primary text and / or image, with a marker of authenticity. The device comprises means 1 for reading media 2 of printed information provided with a visually perceptible primary text and / or image, an authenticity marker forming unit 3, the first input 3 of which is communicated with output 1 a of said means for reading print media, block 4 for storing a secret parameter, the output 4a of which is communicated with the second input 3b of the authenticity marker formation unit 3, the authenticity marker application unit 5 on the recording medium 2, the input 5a of which is communicated with the output 3c of the form 3 unit authentication token. The medium 1 for reading the printed information medium is preferably a scanner that scans the primary text, converting it into binary representation, which is transmitted to the input 3b of the authenticity marker forming unit 3, which is preferably a microprocessor in the form of a separate computing unit or a common computer destination. The secret parameter storage unit 4 is an arbitrary information carrier (floppy disk, smart card, etc.), the information from which is also entered into block 3. The authenticity marker application unit 5 is a media printing device (printer) that applies a marker authenticity received from block 3, on paper 2.

FIG. 2 depicts a basic block diagram of a device for controlling the invariability of primary text on a print medium by analyzing an authenticity marker generated on this print medium, a basic version. This device comprises means 6 for reading an authenticity marker from a printed information medium 2, an authenticity marker control unit 7, an input 7a of which is communicated with an output 6a of said authenticity marker reading means 6, a secondary text recovery unit 8 from an authenticity marker, an input 8a of which is communicated with an output 7b said authenticity token control unit 7. The information authenticity marker reader 6 is preferably a matrix code scanner or a general purpose scanner that reads or scans the authenticity marker, converting it into binary representation, which is transmitted to the input 7a of the authenticity marker control unit 7, which is preferably a microprocessor in the form of a separate computing unit or general purpose computer. The secondary text recovery unit 8 is also a microprocessor combined with a means for displaying the secondary text in a consumer-friendly form (standard or specialized computer display, creeping line of text, paper printing tape, etc.).

A modified version of the device for controlling the immutability of the primary text on the print medium is also possible by analyzing the authenticity marker generated on this print medium. In terms of functionality, this modified version, unlike the basic version, allows you to automatically compare the primary text of a document and its secondary text of the same document, restored from the authenticity marker. To achieve this additional feature, the device further comprises a means 1 for reading a printed information medium provided with a visually perceptible primary text and / or image, and a unit 9 for comparing primary and secondary texts, the first input 9a of which is communicated with the output 1a of said means 1 for reading a medium 2 for printing information and the second 9b - with the output 8b of the mentioned block 8 recovery of the secondary text. Block 9 comparing the primary and secondary texts is, preferably, a microprocessor unit that compares two binary arrays of information.

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In FIG. 4 shows a print medium (or is also referred to as a “document” in the description text), provided with a visually perceptible primary text and / or image, in this case text, and containing an authenticity marker, which is preliminarily generated by calculating the function of the primary text printed on said print medium, and a secret parameter known only to the person forming the authenticity marker. The authenticity marker is located directly below the text and consists of the following three elements:

1) the left element is the text of the document archived on the Ζίρ algorithm and encoded by the BabaMabkh matrix code:

2) the central element is the digital signature of the archived text encoded by the BabaMabkh matrix code:

3) the right element is a digital certificate of a public signature key encoded by the BabaMabkh matrix code.

Claims (13)

1. A method of protecting the authenticity of a printed information medium provided with a visually perceptible primary text and / or image, namely, that an authenticity marker is applied to the printed information medium, which is preliminarily formed by calculating a function of the primary text and / or image applied to said medium printed information, and a secret parameter known only to the person forming the authenticity marker, as a result of which a printed information medium equipped with a genuine marker is obtained validity, after which the authenticity marker is read and the secondary text of the document and / or image is restored from the read information, after which the primary and secondary texts and / or images are compared and based on the comparison, a conclusion is made about the authenticity of the printed information medium. 2. The method according to claim 1, characterized in that as a carrier of printed information using one of the products selected from the following group: product made of plastic, metal product, product made of fabric. 3. The method according to claim 1, characterized in that the function used to form the token of authenticity is unidirectional. 4. The method according to claim 1, characterized in that when calculating the function of forming a marker of authenticity, the digital representation of the primary text is compressed. 5. The method according to claim 1, characterized in that the function used to generate the authenticity marker is a function for computing an electronic digital signature of the primary text. 6. The method according to claim 1, characterized in that the authenticity marker is embedded in the primary text. 7. The method according to claim 1, characterized in that the application of the marker of authenticity on the print medium is carried out by sticking it. 8. A method of generating a document that is a printed information medium and provided with a visually perceptible primary text and / or image with an authenticity marker, which means that an authenticity marker is formed by calculating a function of the primary text and / or image printed on said printed information medium , and a secret parameter known only to the person forming the authenticity marker, after which the generated authenticity marker is applied to the document. 9. A method for monitoring the invariability of the primary text on a printed information medium by analyzing an authenticity marker generated on this printed information medium by the method of claim 8, wherein the authenticity marker is read and the secondary text of the document and / or image is restored from the read information, after which the primary and secondary texts and / or images are compared and, based on the comparison, a conclusion is made about the authenticity of the printed information medium. 10. A device for generating a document comprising a printed information medium and provided with a visually perceptible primary text and / or image with an authenticity marker, comprising means for reading a printed information medium equipped with a visually perceptible primary text and / or image: an authenticity marker formation unit, the first input of which communicated with the output of the aforementioned means of reading the printed information medium: a secret parameter storage unit, the output of which is communicated with the second the input of the authenticity marker formation unit: the authenticity marker application unit on the print medium, the input of which is communicated with the output of the authenticity marker formation unit. 11. The control device for the invariability of the primary text on the print medium by analyzing the authenticity marker generated on this print medium by the method of claim 8, comprising means for reading the authenticity marker from the print medium: the authenticity marker control unit, the input of which is communicated with the output of said means reading an authenticity token: a secondary text recovery unit from an authenticity token whose input is communicated with the output of said authenticity token control unit. - 6 006012 12. The control device for the invariability of the primary text on the print medium according to claim 11, characterized in that it further comprises means for reading a print medium equipped with a visually perceptible primary text and / or image, and a unit for comparing primary and secondary texts, the first input of which is communicated with the release of said means for reading a recording medium, and the second with an output of said secondary text recovery unit. 13. A print medium equipped with a visually perceptible primary text and / or image and containing an authenticity marker, which is preliminarily formed by calculating a function of the primary text and / or image printed on said print medium and a secret parameter known only to the person forming token of authenticity. one ζ '% 3 ^4a \ H ι 4