WO2021084098A1 - Procédé et système de production et de vérification d'un document de sécurité - Google Patents

Procédé et système de production et de vérification d'un document de sécurité Download PDF

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Publication number
WO2021084098A1
WO2021084098A1 PCT/EP2020/080570 EP2020080570W WO2021084098A1 WO 2021084098 A1 WO2021084098 A1 WO 2021084098A1 EP 2020080570 W EP2020080570 W EP 2020080570W WO 2021084098 A1 WO2021084098 A1 WO 2021084098A1
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WO
WIPO (PCT)
Prior art keywords
document
graphic code
color
image
camera
Prior art date
Application number
PCT/EP2020/080570
Other languages
German (de)
English (en)
Inventor
Ralf Grieser
Oliver Muth
Franziska Peinze
Michael Knebel
Original Assignee
Bundesdruckerei Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bundesdruckerei Gmbh filed Critical Bundesdruckerei Gmbh
Priority to EP20800855.7A priority Critical patent/EP4051507A1/fr
Publication of WO2021084098A1 publication Critical patent/WO2021084098A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/305—Associated digital information
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/309—Photographs

Definitions

  • the invention relates to a method for producing a document, in particular a value or security document, for example an identity document, as well as a method and a system for checking the document produced with the method according to the invention.
  • the invention is based on a document that is formed by a product carrier or document body on and / or in which there is a multicolored Be- ⁇ l ⁇ t bS P W ejn Farbf0t0 ⁇ background
  • a large number of documents are equipped with security features that are intended to make forgery difficult or to prevent. These documents also include, above all, value or security documents that serve to identify the identity of a person, for example when crossing a national border, the origin or originality of a thing, or a claim, for example for payment of a sum of money or for the surrender of a Product or service provision.
  • Counterfeiting can be made more difficult or prevented, for example, in that such documents, such as banknotes, are produced from a material that is not readily available.
  • security features can be implemented using special colors, for example luminescent or optically variable colors, optical elements such as holograms, tilt images, cinegraphic objects, lens or prism arrays, guilloches with visible colors / inks or luminescent colors / inks, mottled fibers, security threads and like, be formed.
  • security features used in the valuable or security products can only serve to prove the authenticity of the documents regardless of their type or of their user.
  • Individualizing, for example personalizing, security features also contain, in coded form or in plain text, information about the type of document, about the owner or user of this document, ie personalization data, and / or about an item, an object or an entity to which the document is clearly assigned.
  • Such information can be a portrait picture or portrait photo of the user, his personal data, such as his name, birthday, place of birth, address, or a personal identifier, such as a member number, or his signature.
  • Another security feature that individualizes the valuable or security product can be, for example, a serial number of the product or the chassis number of a motor vehicle to which the product is assigned.
  • the security feature should preferably be located in an inner product level that is secure against counterfeiting and / or falsification and / or copying.
  • the security feature integrated in the product should also be inexpensive, easy and quick to check.
  • the security feature should be able to be integrated into the product using known substances and devices, for example printers.
  • it should be ensured that a colored, in particular multicolored security feature can be integrated into the product without recalibrating individual colors with an existing color management system for CMYK colors.
  • the invention is accordingly based on the object of proposing a document with such a security feature which makes manipulation difficult.
  • the invention is based on the object of proposing a method for producing such a document which offers increased security against manipulation.
  • the invention is based on the object of proposing a method for checking a document according to the invention, as well as a system set up for checking.
  • an identification document such as a passport, identity card, a driver's license or another ID card or an access control card, a vehicle registration document, vehicle registration document, visa, check, means of payment, in particular a bank note, a check, bank, credit or cash card, customer card, health care - card, chip card, company ID, proof of eligibility, membership card, gift or shopping voucher, waybill or other proof of eligibility, tax stamps, postage stamps, tickets, (game) tokens, adhesive labels (e.g. for product security) or another ID document.
  • an identification document such as a passport, identity card, a driver's license or another ID card or an access control card
  • vehicle registration document such as a driver's license or another ID card or an access control card
  • vehicle registration document such as a driver's license or another ID card or an access control card
  • vehicle registration document such as a driver's license or another ID card or an access control card
  • vehicle registration document such as a driver's license or another ID card or an access control card
  • the product can be a smart card.
  • the security or value document can be in ID 1, ID 2, ID 3 or in any other format, for example in booklet form, as in the case of an object similar to a passport.
  • a valuable or security product can be a laminate made of several document layers which are precisely and / or precisely connected to one another, for example fused, under the action of heat and under increased pressure. These products should meet the standardized requirements, for example the standards ISO 10373, ISO / I EC 7810, ISO 14443.
  • the product layers consist, for example, of a carrier material that is suitable for lamination.
  • value or security product includes, in addition to value or security documents, patches, labels and the like, which are part of documents as security elements and for this purpose are inextricably linked to the document carrier or document body or who and form the security feature there .
  • the valuable or security product can be formed from a polymer selected from a group comprising polycarbonate (PC), in particular bisphenol A polycarbonate, polyethylene terephthalate (PET), their derivatives, such as glycol-modified PET (PETG), polyethylene naphthalate (PEN), polyvinyl chloride (PVC), polyvinyl butyral (PVB), polymethyl methacrylate (PMMA), polyimide (PI), polyvinyl alcohol (PVA), polystyrene (PS), polyvinylphenol (PVP), polypropylene (PP), polyethylene (PE) , thermoplastic elastomers (TPE), in particular thermoplastic polyurethane (TPU), acrylonitrile-butadiene-styrene copolymer (ABS) and their derivatives, and / or paper and / or cardboard and / or glass and / or metal and / or ceramics.
  • PC polycarbonate
  • PET polyethylene terephthalate
  • TPE polyethylene tere
  • the product can also be made from several of these materials. It is preferably made of PC, PET and / or PVC.
  • the polymers can be either filled or unfilled. In the latter case, they are preferably transparent or translucent. If the polymers are filled, they are opaque.
  • the above information relates both to films to be joined together and to liquid formulations that are applied to a preliminary product, such as a protective or topcoat.
  • the document is preferably composed of a plurality of material layers or foils, for example from 3 to 12, preferably from 4 to 10 films, made, preferably with a Lami nierhabilit in which the films are melted together under the action of pressure and heat.
  • the individual foils can be made of the same material or of different materials.
  • the production of the document can include the formation of overlay layers. Overlay layers formed in this way protect a security feature arranged underneath and / or give the document the required abrasion resistance.
  • Data that are unique to the document are understood to mean, in particular, personalization data which uniquely identify an owner of the document, i.e. are unique for him and therefore for the document.
  • the data unique to the document can for example include information about the type of document and / or about an item, an object or an entity to which the document is uniquely assigned.
  • the data unique to the document can include, for example, a document ID, such as a serial number.
  • individualized and “individualizing” are used below, this is to be understood as a property of a value or security document according to which the document can be assigned to a specific subject (person, animal, object).
  • personalized and “personalizing” are used below, this is to be understood as the property of a value or security document, according to which the document can be assigned to a person. This property results from predetermined security features of the valuable or security products, preferably from the security printing according to the invention.
  • color impression is used in the description and in the claims of the present application, this is to be understood as the visual impression we see on a human observer with regard to the color effect, these different impressions consisting of different shades of color, ie spectrally under different absorptions and / or brightnesses of a print can result.
  • the color impression can also result from interacting, closely spaced discrete Color tones result which produce a color impression in a human viewer which differs from each of the closely spaced color tones.
  • die is used in the description and in the claims of the present application, it is understood to mean a substance or a mixture of substances. The substance or substances absorb light in the visible spectral range Chemically dissolved printing ink.
  • color pigment is used in the description and in the claims of the present application, it is to be understood as meaning a substance or a mixture of substances. This substance or these substances show light absorption in the visible spectral range Printing ink is not chemically soluble and is in the form of separate particles.
  • Visual Insofar as the term "visual” is used in the description and in the claims of the present application, this is to be understood as the visual perception of a person with normal vision, in particular with regard to the spectrum of the perceived wavelengths. Visual therefore refers to wavelengths in the visible spectrum. A pure one Correction of ametropia, for example nearsightedness or farsightedness, without measures that shift the light spectrum is included.
  • a method for producing a document with a document body and a visually imperceptible security feature connected to the document body comprises providing a key pair made up of a public and private key, ie an asymmetrical cryptographic key pair, and encrypting data unique to the document with the public key of the key pair.
  • a key pair consisting of a public and private key enables encryption to be carried out at a large number of locations without the key required for decryption having to be available at this large number of locations. This makes it easier to keep the private key secret.
  • the method further comprises coding the encrypted data in a graphic code, in particular an optoelectronically readable graphic code.
  • the graphic Code can, for example, be a one-dimensional code, such as a barcode, or a two-dimensional code, such as a matrix code, for example a QR code, which are composed of combinations of two distinguishable elements.
  • the method also includes providing a color photo to be associated with the document, for example a portrait of a person, a photo of an animal or an object to which the document relates, and embedding the graphic code in the color photo.
  • the method further comprises joining the photo and the graphic code embedded therein to the document body.
  • the connection of the photo and the graphic code embedded therein with the document body can be done, for example, by printing the document body, for example on a carrier layer of the document body.
  • the carrier layer is a layer which is provided as a carrier for the photo and the graphic code embedded therein or for printing with the photo and the embedded graphic code.
  • the document body is, for example, a composite body which comprises a plurality of material layers. One of these material layers is, for example, the carrier layer.
  • the photo and the graphic code embedded therein are printed on one or more carrier layers.
  • the photo and the graphic code embedded therein are printed in areas distributed over several carrier layers.
  • a large number of colors for the presentation of color images is printed with a few printing colors, for example by printing very small, closely spaced areas or dots with the colors cyan, magenta, yellow and black.
  • These inks are also referred to by the abbreviations C, M, Y and K. Viewed from a distance from which the areas printed with a single color are no longer individually perceptible, these areas appear in the most varied of color tones depending on the area ratio of the printing inks.
  • the black printing ink, K can exist in two different versions, K and K + that are visually indistinguishable, one of which is transparent to IR light and the other is opaque.
  • each area of a color image has a greater or lesser proportion of black printing ink.
  • the black portion of the color photo is printed with one version of the black printing ink in areas of the photo in which the first of the two distinguishable elements of the graphic code are located, while in areas of the photo in which the second of the two distinguishable elements of the graphic code, the black portion of the color photo is printed with the other version of the black printing ink. Because the two versions are visually indistinguishable, a human viewer sees a normal color photo. The visual indistinguishability also applies to a recording with the color camera, ie the signals from the color camera for the different versions of the printing inks are identical.
  • the graphic code When illuminated with IR light and recording with a camera that is sensitive in the IR spectrum, the graphic code becomes visible.
  • the elements of the graphic code printed with the IR light-absorbing version of the black printing ink within an element or from element to element can have strongly fluctuating degrees of absorption which are dependent on the image content of the color image.
  • a graphic code which does not occupy the entire area of the photo can be positioned at a point on the photo which, viewed over the area of the graphic code, exhibits the smallest fluctuations in the proportion of black printing ink. It is sufficient if the fluctuations in the proportion of black printing ink are minimized in the areas that are printed with the IR light-absorbing variant of the printing ink.
  • the information about the black components can already be available when the photo is rendered into the individual printing colors or can be generated by a corresponding analysis.
  • the graphic code can then be positioned at different points within the image, and the respective fluctuation in the proportions of black printing ink can be determined.
  • Refinements of the method include the provision of an assignment that establishes a relationship between color signals from a color camera and monochrome signals from an infrared Spectrum (IR) sensitive camera for a variety of colors generated by mixing of printing inks intended for the production of the document.
  • the signals from the color camera are, for example, triples of values for the primary colors red, green and blue (RGB) or signals derived therefrom, such as YPbPr or YCbC r .
  • the monochrome signals of the camera which is sensitive in the IR spectrum, correspond to brightness levels of the respective color tones when the color tones are illuminated with IR light.
  • the relationship between the color signals and the monochrome signals can take place, for example, as an assignment table (LUT) or in the form of one or more analytical descriptions.
  • the relationship can be done, for example, by creating a color image of a color reference panel and a corresponding image with the camera sensitive in the IR spectrum when illuminated with light in the IR spectrum, with the signals from the color camera and the camera sensitive in the IR spectrum for identical image areas in the recordings can be assigned to each other.
  • the assignment can, for example, depict the relationship between the color signals and the monochrome signals for a carrier material used in the production of the document, a printing process and / or a surface coating.
  • Corresponding information about the parameters or materials on which the manufacturing process is based or used, and the corresponding assignment can be attached to the document, for example, in machine-readable form, or can be determined by analyzing the document.
  • the information can also be attached to the document as a reference, for example as a reference to an entry in a database.
  • the placement of the graphic code in the photo can be adapted depending on its content and / or the recognition of the graphic code during the check can be improved.
  • joining the photo and the graphic code embedded therein to the document body comprises printing the photo and the graphic code embedded therein on one or more of the layers of the document body.
  • adjoining areas of the photo and the embedded Graphic codes are printed on different layers of the document body in such a way that the boundaries of the adjacent areas cannot be seen when viewed perpendicular to the surface of the document body, but the viewer is shown a complete picture.
  • the adjoining areas can have any shape, for example rectangles or squares; However, it is also conceivable to print individual adjoining image points composed of several printing inks on different layers of the document body, or individual printing inks in each case in separate layers.
  • inseparable means not non-destructively separable. If layers of the document body are inseparably or non-destructively separable connected to one another, e.g. glued and / or fused, these layers can no longer be separated from one another in such a way that at least one of the layers is in its original state, i.e. its state before joining, is present.
  • the printing inks are preferably located in the interior of the document. When gluing or fusing, printing inks can penetrate the document body and bond with the document body, so that even if the layers are removed layer by layer, a surface that contains the complete photo and the graphic code embedded therein cannot be obtained at any time shows.
  • the method also includes attaching or applying the data, which is unique for the document, to or on the document in at least one further representation.
  • the at least one further representation can, for example, comprise an alphanumeric representation, in plain text or encrypted, a representation in a hologram, or the like. This makes it possible to provide a simple possibility of determining the authenticity of the document by comparing the data of the graphic code embedded in the photo with data extracted from the further representation, or at least of determining that the document has not been tampered with.
  • the method also includes connecting an electronic circuit to the document body.
  • the electronic circuit for example.
  • a microchip with an interface for contact or contactless communication with the electronic circuit and a memory can store a representation of the data unique to the document, which can be compared with data contained in the graphic code.
  • the electronic circuit can store further data that are particularly protected against unauthorized access.
  • the graphic code can contain access data which are fed to the electronic circuit in an authentication or authorization phase.
  • the electronic circuit can be set up, for example, to compare the data from the graphic code with access data stored in the electronic circuit.
  • the electronic circuit can allow access to the other stored data.
  • correspondingly matching access data are stored in the graphic code and in the electronic circuit during the production of the document.
  • the electronic circuit can be a semiconductor circuit that is, for example, silicon-based or polymer-electronic.
  • the electronic circuit can be implemented by a chip that is located on or in a document layer.
  • the electronic circuit can also be formed from polymerelectronic components that are applied to the document layer by printing, for example.
  • a method according to the invention for checking a document produced according to one of the above-described embodiments of the method comprises taking a color image of at least the photos associated with the document with a color camera, and taking a monochrome image of the photos associated with the document with one in the IR -Spectrum sensitive camera under illumination with infra red light.
  • the monochrome image corresponds to a brightness level image and can also be displayed as a grayscale image.
  • the method also includes calculating an image from the color image which corresponds to its brightness level image if it had been recorded with a camera sensitive in the IR spectrum when illuminated with infrared light.
  • the calculation can be done using the mapping that was provided when the document was produced.
  • calculating the brightness level image only one opaque variant of a printing ink that is available in two variants is taken into account, the other variant of which is transparent when illuminated with infrared light.
  • the calculated image is available, it is compared with the monochrome image recorded by the camera sensitive in the IR spectrum under illumination with IR light.
  • the comparison comprises a comparison of the brightness levels of the calculated image and the monochrome image, with equal areas of the images being compared.
  • the image brightness and / or the contrast can be adjusted for one or both images before the comparison.
  • the comparison leads to a difference image in which the graphic code embedded in the photo can already be recognized.
  • the binary graphic code is reconstructed from the difference image.
  • the coding parameters supplied to the device executing the method can be used, which were used in the generation of the graphic code, for example a number of modules arranged next to one another, their spatial extent, an error correction used in the coding, and the like.
  • the coding parameters can be supplied from a database, for example. Information can be present on the document which is fed to the database in order to select the encoding parameters suitable for the document. This information is preferably designed to be machine-readable.
  • the coding parameters can be transmitted to the device executing the method via a secure data connection. The reconstructed graphic code is then decoded.
  • the difference image can be sent to a reconstruction device located remotely from the device executing the method, preferably via a secure data connection, the reconstruction device sending the reconstructed graphic code or the decoded content of the graphic code to the person executing the method Device sent back.
  • the reconstruction device can also use coding parameters used in the generation of the graphic code for the reconstruction. When reconstructing in a remotely located reconstruction device, the coding parameters do not have to be sent to a large number of reading devices, which can contribute to improved security.
  • the content of the decoded graphic code, which is present in encrypted form, is decrypted in a further step of the method with the aid of the private key belonging to the public key used for the encryption.
  • the private key can be fed to the device executing the method, preferably via a secure data line, wherein the key can be selected on the basis of preferably machine-readable information contained on or in the document.
  • the encrypted information can be sent to a decryption device located remotely from the device executing the method, preferably via a secure data connection, the decryption device sending the decrypted content back to the device executing the method.
  • the private key does not have to be sent to a large number of reading devices, which can contribute to improved security.
  • the reconstruction device and the decryption device can be arranged together in a unit arranged remotely from the reading device, so that the reconstruction and decryption in one go on the remotely arranged unit and only the decrypted content of the graphic code has to be sent back to the device executing the process, for example the reader.
  • the decrypted information is provided in a digitally processable format.
  • the method further comprises extracting data unique to the document from at least one further representation contained in the document, and providing the extracted data in a digitally processable format.
  • the extraction of the data, which is unique for the document, from at least one further representation can preferably take place from an image of the area of the document containing the further representation, which is recorded by the camera, which is sensitive in the IR spectrum, under illumination with infrared light.
  • the method also comprises comparing the decrypted information with the data extracted from the further representation contained in the document, and determining a degree of correspondence. From a specified degree of correspondence, the document is classified as genuine and a corresponding signal is output.
  • the signal can, for example, be a release signal for an access control, for example a security gate or the like.
  • a system for checking a document produced according to one of the above-described Ausgestaltun conditions of the method comprises a color camera, a light source whose light enables the color camera to record a color image, a camera which is sensitive in the IR spectrum and which, when an object is illuminated with infrared light Brightness level image is generated, and an infrared light source for illuminating at least one area of the document to be recorded by the camera which is sensitive in the IR spectrum.
  • the color camera and the camera that is sensitive in the IR spectrum can also be combined in one camera, for example if the one camera outputs a color image when illuminated with essentially white light and when the light is essentially in the IR spectrum, the light has a brightness level image.
  • the system also includes a first memory that provides an assignment that depicts a relationship between color signals from a color camera (RGB) and monochrome signals from a camera sensitive in the IR spectrum for a multitude of color tones generated by mixing printing inks intended for the production of the document , the monochrome signals corresponding to brightness levels of the respective color tones when illuminated with IR light.
  • RGB color camera
  • the system further comprises a conversion module which is set up to calculate an image from a color image recorded by the color camera using the assignment, which corresponds to its brightness level image when recorded by a camera sensitive in the IR spectrum when illuminated with infrared light, if only one when illuminated with IR light, an opaque variant of a printing ink available in two variants is used, the other variant of which is transparent when illuminated with infrared light.
  • a conversion module which is set up to calculate an image from a color image recorded by the color camera using the assignment, which corresponds to its brightness level image when recorded by a camera sensitive in the IR spectrum when illuminated with infrared light, if only one when illuminated with IR light, an opaque variant of a printing ink available in two variants is used, the other variant of which is transparent when illuminated with infrared light.
  • the system comprises an extraction module that is set up to extract unique data for the document from at least one further representation contained on or in the document and to provide it in a digitally processable format, and a first comparison module, which is illuminated with infrared light compares the recorded brightness level image of the camera sensitive in the IR spectrum with the brightness level image calculated from the color image and forms a difference image that contains a graphic code.
  • the system also comprises a second memory, which provides coding parameters used in the coding of encrypted data in the graphic code, and a reconstruction module which is set up to reconstruct the graphic code from the difference image with the aid of the provided coding parameters.
  • the second memory can be arranged with the reconstruction module in a device or be connected to the reconstruction module via a data connection.
  • the system comprises a decoder module or decoding module which is set up to decode the reconstructed graphic code and to provide its content in a digitally processable format.
  • the system further comprises a third memory which provides a private key of a key pair belonging to a public key used in the encryption of the data contained in the graphic code, and a decryption module which is set up to store the content of the decoded, reconstructed graphic code to decrypt with the provided private key, and to provide the decrypted information in a digitally processable format.
  • the system further comprises a second comparison module which is set up to determine a degree of correspondence between the decrypted information and the data that is unique for the document and extracted from the at least one further representation.
  • the second comparison module is also set up to classify the document as genuine and to output a corresponding signal if the degree of agreement exceeds a specified value.
  • the conversion module, the extraction module, the first and the second comparison module, the reconstruction module, the decoder module and the decryption module can be present as computer programs or as hardware components, or as a combination of hardware components and computer programs.
  • the modules can be implemented in a computer or device; however, the modules can also be implemented in separate computers or devices that are communicatively connected to one another.
  • the first, second and third memories can be formed by databases that are part of the system or are communicatively connected to it.
  • the system can have single or multiple local memories assigned to the modules, which at least temporarily stores data obtained from the databases.
  • the system can be communicatively connected to an access control device, for example a security lock for goods or people, the signal output by the second comparison module being fed to the access control as a release signal.
  • an access control device for example a security lock for goods or people
  • FIG. 1 shows an exemplary flow diagram of an embodiment of the method according to the invention for producing a document with a document body and a visually imperceptible security feature connected to the document body,
  • FIG. 2 shows an exemplary flowchart of partial steps of the method according to the invention for producing a document with a document body and a visually imperceptible security feature connected to the document body
  • FIG. 5 shows an exemplary flow diagram of a method according to the invention for checking a document with a document body and a visually imperceptible security feature connected to the document body
  • FIG. 4 shows an exemplary block diagram of a system for checking a document with a document body and a visually imperceptible security feature connected to the document body
  • FIG. 5 shows an exemplary embodiment of a variant of a document produced by the method according to the invention.
  • FIG. 1 shows an exemplary flow diagram of an embodiment of the method 100 according to the invention for producing a document with a document body and a visually imperceptible security feature connected to the document body.
  • a key pair comprising a public and private key is provided.
  • the public key of the key pair is used for the documentation ment unique data is encrypted in step 106 and encoded in step 108 into a graphic code, e.g. a barcode or a matrix code.
  • a photo to be linked to the document is provided, in which in step 112 the graphic code is embedded.
  • an association is provided in step 102 which depicts a relationship between color signals from a color camera and monochrome signals from a camera sensitive in the IR spectrum for a multitude of color tones generated by mixing printing inks intended for the production of the document.
  • the monochrome signals correspond to brightness levels of the respective color tones when illuminated with IR light.
  • the photo with the graphic code embedded therein is connected to the document body in step 114, for example by printing.
  • Printing can be carried out using one of two visually indistinguishable variants of one of the printing inks provided for the production of the document, one variant of which is opaque when illuminated with infrared light and the other variant is transparent, and for which the color signals recorded by the color camera are used do not differ.
  • the variant used in each case of the printing ink which is available in two variants, is selected when the graphic code is embedded in the photo in step 112 and is appropriately fed to a printing device as printing information.
  • FIG. 2 shows an exemplary flow chart of partial steps of the method 100 according to the invention for producing a document with a document body and a visually imperceptible security feature connected to the document body.
  • the substeps relate to the provision of the assignment in step 102 of the method 100, more precisely to the creation of the assignment.
  • a color reference table is first printed using the printing inks provided for the production of the document and, if necessary, a carrier material provided for the production of the document.
  • the color reference board depicts a variety of color tones that appear in one or more photos to be associated with the document.
  • step 102-2 a color image is recorded from the color reference panel, and in step 102-3 a monochrome image is recorded with a camera sensitive in the IR spectrum when the color reference panel is illuminated with IR light. Steps 102-2 and 102-3 can take place in any order.
  • step 102-4 the color tones of the color image located at certain positions in the color reference table are located at corresponding positions. assigned to values of the monochrome image. The assignment can be provided as an assignment table or in the form of an analytical description.
  • FIG. 3 shows an exemplary flow diagram of a method 300 according to the invention for checking a document with a document body and a visually imperceptible security feature connected to the document body.
  • a color image of at least one photo associated with the document 200 is recorded with a color camera
  • a monochrome image of at least the photo associated with the document 200 is taken with a camera sensitive in the IR spectrum under illumination with IR light recorded. The order of the recordings is irrelevant.
  • step 306 an image is calculated from the color image, which corresponds to its brightness levels image when recorded by a camera sensitive in the IR spectrum when illuminated with infrared light, if only one opaque variant of a printing ink present in two variants is used, the other variant when illuminated is transparent with infrared light.
  • an assignment can be provided in step 306-1, for example an assignment made in the manner described with reference to FIG. 2.
  • step 308 the monochrome image is compared with the image calculated from the color image and a difference image is formed.
  • step 310 a graphic code embedded in the photo is reconstructed from the difference image, the content of which is decoded in step 312.
  • coding parameters supplied in step 310-1 can be used which were used in the generation of the graphic code.
  • the coding parameters can preferably be transmitted in encrypted form.
  • the difference image can be transmitted in step 310-2 to a reconstruction device, which in step 310-3 sends back the reconstructed graphic code for decoding in step 312.
  • the reconstruction device can also send back the decoded content so that it is decrypted immediately in step 314.
  • the reconstruction device can be communicatively connected to the other components of the system.
  • a reconstruction device can be connected to several subsystems, so that not every subsystem has to have its own reconstruction device.
  • step 314 the decoded content of the graphic code is decrypted with the aid of the private key belonging to the public key used in the encryption, and the decrypted information is provided in a digitally processable format.
  • the private key is supplied in step S14-1.
  • the decoded content can be transmitted to a decryption device in step S14-2, from which the decrypted content is sent back in step S14-S.
  • the decoded content can also be sent directly from the reconstruction device to the decryption device, from where the decrypted information is sent back to the device executing the method.
  • step S16 data that are unique for the document are extracted from at least one further representation contained in the document and provided in a digitally processable format.
  • the extraction can preferably take place from the monochrome image, but it is also possible to use the color image for the extraction.
  • step S18 the extraction takes place is of secondary importance, it is only important that the data are available before step S18, in which the decrypted information is compared with the data extracted from the further representation contained in the document.
  • step S20 a degree of correspondence is determined. From a specified level of correspondence, the document is classified as genuine and a corresponding signal is output.
  • FIG. 4 shows an exemplary block diagram of a system 400 for checking a document with a document body and a visually imperceptible security feature connected to the document body.
  • the system comprises a color camera 402 and a camera 406 sensitive in the IR spectrum, as well as a light source for color recordings 404 and an IR light source 408.
  • the cameras 402, 406 take images of that which is also shown in the figure and illuminated by the light sources 404, 408 Documents 200 that do not belong to the system.
  • the image from the color camera is sent to a conversion module 412, which calculates an image from the color image using an assignment supplied by memory 410, which corresponds to its brightness level image when recorded by a camera sensitive in the IR spectrum when illuminated with infrared light, if only one opaque variant of a printing ink present in two variants is used, the other variant of which is transparent when illuminated with infrared light.
  • the calculated image and the image of the camera 406 sensitive in the IR spectrum are sent to a first comparison module 416, which is the image of the brightness level of the infrared light sensitive in the infrared spectrum. ra 406 compares with the brightness level image calculated from the color image and forms a difference image which contains a graphic code.
  • the image from the camera 406, which is sensitive in the IR spectrum, is also fed to an extraction module 414, which is set up to extract data unique to the document from at least one further representation and to provide it in a digitally processable format.
  • the color image can be fed to the extraction module 414.
  • the difference image formed in the first comparison module 416 is fed to a reconstruction module 420 which is set up to reconstruct the graphic code from the difference image.
  • the reconstruction module 420 can use coding parameters provided by a second memory 418, which were used during the coding.
  • the reconstructed graphic code is fed to a decoder module 422 which is set up to decode the reconstructed graphic code and to provide its content in a digitally processable format.
  • the decoded content is fed to a decryption module 426 which is set up to decrypt the content of the decoded, reconstructed graphic code and to provide the decrypted information in a digitally processable format.
  • the decryption module 426 can use a private key of a key pair that is provided by a third memory 424 and that each belongs to the public key.
  • the decrypted information and the data extracted from the further representation are fed to a second comparison module 428, which is set up to determine a degree of correspondence between the decrypted information and the data extracted from the at least one further representation, which is unique for the document .
  • the second comparison module 428 is set up to classify the document 200 as genuine, valid or the same in the event of a degree of correspondence exceeding a defined value and to output a corresponding signal.
  • the signal can, for example, be passed to an access control device 430 in order, depending on the result of the checking of the document, to grant or deny a person access to a protected area.
  • FIG. 5 shows an exemplary embodiment of a document 200 produced by the method according to the invention when detected with a camera under illumination in the visible spectrum of light and when detected with a camera sensitive in the IR spectrum. mera with lighting with IR light.
  • FIG. 5 shows the image that is shown to a human observer with appropriate lighting, ie the observer sees the photo 202 embedded in the document.
  • a camera sensitive in the IR spectrum is below Illumination with IR light record an image as shown in FIG. 5, ie a security feature 208 embedded in the image can be recognized.
  • only the part of the photo 202 formed by the black color particles absorbing the IR light would be recognizable, shown in FIG. 5.
  • FIG. 5 shows an exemplary embodiment of a variant of a document 200 produced by the method according to the invention.
  • the document body of the document shown in the figure comprises four layers 200-1, 200-2, 200-3 and 200-4, which are inseparably connected to one another to obtain the document 200.
  • a part of a photo 202 with a visually imperceptible security feature 208 embedded therein or a part thereof can be connected. Only in the connection are all parts of the photo and the security feature 208 embedded therein arranged together in such a way that a viewer can recognize the photo and a camera sensitive in the IR spectrum can fully record the security feature 208 when illuminated with IR light.
  • the photo with the security feature 208 embedded therein is shown as a monochrome image of the camera sensitive in the IR spectrum for reasons of clarity - a human viewer would not perceive the matrix code representing the security feature 208.
  • a further feature for example a serial number 204, can be provided, whose individual digits or possibly letters or other characters are each printed once on different layers of the document body, so that only when all layers are connected to the finished document gives the entire serial number.
  • An electronic circuit 206 is also connected to the layer 200-2 and has an interface for contact-based or contactless communication with a reading device not shown in the figure. Further contents of the document are not shown in FIG. 6 for the sake of clarity.
  • FIG. 6 shows a further example of a view of an exemplary document 200 produced using the method described herein, which would be presented to a human observer, with further features not described in detail here.

Landscapes

  • Editing Of Facsimile Originals (AREA)

Abstract

Un procédé de production d'un document ayant un corps de document et un élément de sécurité visuellement imperceptible joint au corps de document consiste à fournir une paire de clés (104) comprenant une clé publique et une clé privée, chiffrer (106) des données qui sont uniques au document à l'aide de la clé publique de la paire de clés, et à coder (108) les données chiffrées en un code graphique. Le procédé consiste en outre à fournir (110) une photographie à joindre au document, incorporer (112) le code graphique dans la photographie, et joindre (114) la photographie et le code graphique incorporé dans celle-ci au corps de document.
PCT/EP2020/080570 2019-10-31 2020-10-30 Procédé et système de production et de vérification d'un document de sécurité WO2021084098A1 (fr)

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DE102019129490.8A DE102019129490A1 (de) 2019-10-31 2019-10-31 Verfahren und System zur Herstellung und zur Überprüfung eines Sicherheitsdokuments
DE102019129490.8 2019-10-31

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130301870A1 (en) * 2012-05-03 2013-11-14 Hong Kong University Of Science And Technology Embedding visual information in a two-dimensional bar code
WO2017148704A1 (fr) * 2016-03-02 2017-09-08 Ovd Kinegram Ag Document de sécurite et procédé permettant d'authentifier ce document
US20180186167A1 (en) * 2016-12-30 2018-07-05 Morphotrust Usa, Llc Embedded variable line patterns

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2743893A1 (fr) * 2012-12-12 2014-06-18 Gemalto SA Procédé de sécurisation d'un document comprenant des informations imprimées et document correspondant
FR3058541B1 (fr) * 2016-11-09 2018-11-23 Surys Procede pour l’authentification d’une illustration.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130301870A1 (en) * 2012-05-03 2013-11-14 Hong Kong University Of Science And Technology Embedding visual information in a two-dimensional bar code
WO2017148704A1 (fr) * 2016-03-02 2017-09-08 Ovd Kinegram Ag Document de sécurite et procédé permettant d'authentifier ce document
US20180186167A1 (en) * 2016-12-30 2018-07-05 Morphotrust Usa, Llc Embedded variable line patterns

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