Abstract: The device (100) for protecting a document (125) comprises: —a means (120) for inputting a digital file representing an image of at least a part of the document, —a means (135) of extracting characteristic elements of the image and of positions of said characteristic elements on the document, —a means (140) of encoding characteristic elements of the image and data representative of position of said characteristic elements on the document, and to a matrix code and—a means (155) of printing the matrix code on or in said document. In embodiments, the device comprises: —a means (165) of determining a location of the document not bearing any information, and/or—a means (165) of determining the shape of the matrix code corresponding to the location of the document not bearing information, the printing means printing the matrix code at the determined location and according to the determined shape.

Abstract: The invention relates to a method for securing access to a website which includes, in series: a step (202) of a first user terminal accessing said site; a step (206) of entering a message with the user terminal on a page of the site; a step (208) of transmitting the message to a server of the website; a step (210) of the server of the website encrypting the message in order to form a visible code; a step (212) of displaying the visible code on a display screen of the first user terminal; a step (216) of taking an image of the visible code using a second user terminal, optionally identical to the first user terminal; a step (218) of decrypting the code using the second user terminal; and a step (220) of providing the user with the message decrypted by the second user terminal.

Abstract: A method of marking a holographic matrix. The method includes forming the holographic matrix, which is designed to produce holograms by printing. At least one anti-copy mark on the holographic matrix is formed and at least one copy-robust mark on the holographic matrix is formed. At least one of the steps for forming at least one mark on the holographic matrix uses laser-structuring of the holographic matrix surface. Preferably, the anti-copy mark represents a message and a plurality of redundancies of the message carried by the anti-copy mark. Also, preferably, a picosecond laser is used to form the anti-copy mark is formed.

Abstract: A device for producing a document carrying the identification of a person/animal. A first detector to determine the printing conditions of the document. A sensor to obtain the biometric data of the person/animal. A first encoder encodes the biometric data to form a digital identification image including redundancies. A second detector to determine physical characteristics of cells of at least one shape, such that the proportion of cells printed with a print error results from unanticipated unknowns in printing. A second encoder to form, within the shape, an authentication image for authenticating the document and includes elementary cells representing the encoded authentication image. A printer to print the authentication and identification images on the document, and to generate random errors in the printed elementary cells of the authentication image to detect modification to the appearance of the elementary cells.

Abstract: A method for authenticating a tag, includes: a step (205) of capturing an image, with a communicating mobile terminal, of at least a portion of a tag having at least a portion of an identifier; a step (210) of transmitting the identifier to a server; a step (215) of reading, from a memory of tag images, the image of a tag having the identifier; a step (220) of transmitting, to the communicating mobile terminal, at least a portion of the image read from the memory; and a step (230) of displaying at least a portion of the transmitted image superimposed on an image captured by the terminal.

Abstract: A device for producing a document carrying the identification of a person/animal. A first detector to determine the printing conditions of the document. A sensor to obtain the biometric data of the person/animal. A first encoder encodes the biometric data to form a digital identification image including redundancies. A second detector to determine physical characteristics of cells of at least one shape, such that the proportion of cells printed with a print error results from unanticipated unknowns in printing. A second encoder to form, within the shape, an authentication image for authenticating the document and includes elementary cells representing the encoded authentication image. A printer to print the authentication and identification images on the document, and to generate random errors in the printed elementary cells of the authentication image to detect modification to the appearance of the elementary cells.

Abstract: he method for marking a product includes: a step of forming, on or in the product, a mark robust to copying, with a first resolution, a step of forming, on or in the product, a mark sensitive to copying, with a second resolution higher than the first resolution, a step of capturing an image of the robust mark, the sensitive mark and another part of the product and a step of memorizing an item of information representing the image of the robust mark, the sensitive mark and the other image part. In embodiments, during at least one forming step, the position of the mark formed during this forming step is random in relation to the other image part.

Abstract: A method for securing a document, includes: a step of determining print conditions of the document; a step of determining physical characteristics of cells of at least one shape, according to the print conditions, such that the proportion of cells printed with a print error coming solely from unanticipated unknowns in printing is greater than a pre-defined first value and less than a pre-defined second value; a step of representing an item of information by varying the appearance of cells presenting the physical characteristics and a step of printing the shape utilizing the print conditions, the shape being designed to enable the detection of a copy modifying the appearance of a plurality of the cells.

Abstract: The authentication process comprises: a step of generating a random number (105), a step of generating a time-stamp (115), a step of generating a first secret key (120), a step of truncating the message authentication code utilizing said first secret key (125), a step of symmetrically encrypting the random number, time-stamp and truncation (135), utilizing a second secret key (130) to produce an authentication code (145). Preferably, during the step of generating a random number, a quantum generator (100) is utilized. Preferably, during the truncation step, a cryptographic message authenticator is generated utilizing the first secret key. Preferably, during the step of symmetrically encrypting the random number, time-stamp and truncation, by utilizing the second secret key, in addition a hash (140) is produced.

Abstract: A material marking method includes: generating a code; randomly selecting at least one area of the material; and marking by laser shot on the surface of, or inside the material in each the area of the material to represent the code there in a way that cannot be detected by the naked eye. Preferentially, the randomly selecting step is performed for each item of material to be marked. Preferentially, during the code generating step, a two-dimensional bar code is generated, and during the marking step, the two-dimensional bar code is represented. Preferably, the method includes marking the material in order to represent a mark visible to the naked eye, at least one part of a marking area of a mark visible to the naked eye is selected randomly and/or the visible mark bears an item of information representative of the position of at least one area where the code that cannot be detected by the naked eye is represented.

Abstract: A method for identifying a printing plate for a document includes: printing at least one document with the plate, capturing, at high resolution, at least one image of at least one part of the document, extracting a geometric characteristic of at least one captured image, storing the geometric characteristic extracted, for a candidate document where one seeks to determine whether the printing plate was used to print it, capturing, at high resolution, an image of the part of the candidate document corresponding to the part of the document for which a geometric characteristic has been stored, extracting the geometric characteristic of the image of the candidate document corresponding to the stored geometric characteristic; and determining whether a correlation measurement of the geometric characteristic for the candidate document and the stored geometric characteristic is greater than a pre-defined limit value.

Abstract: A method for reading a physical characteristic on an object includes: a step (240, 315, 405) of capturing a first image of at least a portion of the object with a first resolution; a step (245, 320, 415, 420) of determining the position of an area of the object to be processed, according to the first image; a step (255, 330, 430) of capturing a second image of the area of the object to be processed, with a second resolution higher than the first resolution; and a step (260, 335, 440) of determining the physical characteristic based on the second image. In some embodiments, there is, in addition, a step of marking the object with a mark bearing information representative of at least a portion of the physical characteristic.

Abstract: The method includes determining characteristics of an item of equipment printing the original document; determining a mark allowing an original to be distinguished from a copy, according to characteristics of the print equipment destined to be utilized for printing the mark on the document; printing the mark with the print equipment to form the original document; and determining a first limit value to be used by an item of copy detection equipment to distinguish the original document from a copy of the original document, according to at least one print of the mark. Preferably, the method includes a step of printing at least one print reference representative of an authorized maximum or minimum inking for printing the document and, during the step of determining the first limit value, a measurement is determined over at least one the print reference and a tolerance is added to it.

Abstract: A method for marking a surface by controlled periodic nanostructures includes: a step (500) of coding an item of information in the form of an image including values representative of the coded information and a step (506 to 514) of marking, dot by dot, an area of the surface with a polarized laser beam to form oriented nanostructures on or in the surface, by modulating the laser beam's polarization for each marking dot according to the value of a dot of the image. In embodiments, during the marking step, a pulsed laser is utilized with a duration of less than 10×10?12 seconds and an element of polarizing the light coming from the laser source and reaching the surface, designed to polarize the light according to a polarization axis that can vary according to a signal received by the polarization element, is utilized.

Abstract: The authentication process comprises: a step of transferring a holographic matrix onto a base, a step of marking the holographic matrix by laser shot, in order to produce a digital code that cannot be interpreted by the human eye, preserving the optical diffraction properties of the holographic matrix, and designed to enable the detection of a copy of a document realized using the holographic matrix. Preferentially, during the marking step, the impact of each laser shot presents a greater dimension and a depth allowing the hologram's optical diffraction properties to be preserved.

Abstract: The authentication process for a group of products includes, for each product: a step for marking the product to produce a mark representative of a first content and, a step of associating a data carrier to the product, the data carrier bearing an item of information representing, firstly, the first content and, secondly, a key specifically assigned to the product in the group of products, the representative item of information being, as a result, different for each product of the group.