Abstract:
The method for authenticating a code with geometric areas whose shapes and/or colors vary according to a message includes: a step (115) in which the code with variable geometric areas is generated, according to a message, to provide geometric areas; a step (120 to 130) in which a digital authentication code is generated to provide numeric values and a step (135) in which an image of the geometric code areas is formed, including a part of the digital authentication code in at least some of its geometric areas and/or in at least one space between geometric areas.
Abstract:
The document identification method comprises: a step of marking the document with an anti-copy mark that is identical for a plurality of documents, a step of reading an anti-copy mark, a step of generating an identification mark that can vary from one document to another and according to the reading of the anti-copy mark and a step of marking said document to form said identification mark on said document. In embodiments the method comprises, in addition, a step of printing a uniform area and the step of marking the document to form the identification mark comprises a step of emitting light with a laser in the uniform area.In embodiments the method comprises, in addition, a step of invisibly marking the identification mark on said document.
Abstract:
The document identification method comprises: a step of marking the document with an anti-copy mark that is identical for a plurality of documents; a step of reading an anti-copy mark; a step of generating an identification mark that can vary from one document to another and according to the reading of the anti-copy mark and; a step of marking said document to form said identification mark on said document. In embodiments the method comprises, in addition, a step of printing a uniform area and the step of marking the document to form the identification mark comprises a step of emitting light with a laser in the uniform area. In embodiments the method comprises, in addition, a step of invisibly marking the identification mark on said document.
Abstract:
A document securization method includes:a first step of forming a first mark (205, 210) on a first surface of a document by utilizing a first marking element,a second step of forming a second mark (215) on another surface of the document or in the depth of the document by utilizing a second marking element,the two marks are superimposed when the document is illuminated by back-lighting andat least one (215) of the marks is a mark whose copy, made using marking elements identical to those utilized for forming the mark, causes an error rate, measured dot by dot, that is greater than a predefined value.
Abstract:
A device for reading a message includes a reader to read biometric data of a holder of the medium and a scanner to capture, on a medium, an encoded message having elementary message units. The message includes a noise that consists of marking defects of the message on the medium which are random and unpredictable for each elementary message unit. A noise reducer to reduce the noise of the captured message based on biometric data. A decoder to decode at least one portion of the message in which the noise has been at least partially removed. Preferably, the decoder utilizes redundancies of the message with the noise removed to determine at least one portion of the encoded message.
Abstract:
A document securization method includes: a first step of forming a first mark (205, 210) on a first surface of a document by utilizing a first marking element, a second step of forming a second mark (215) on another surface of the document or in the depth of the document by utilizing a second marking element, the two marks are superimposed when the document is illuminated by back-lighting and at least one (215) of the marks is a mark whose copy, made using marking elements identical to those utilized for forming the mark, causes an error rate, measured dot by dot, that is greater than a predefined value.
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 process for securing a document including a step of printing a distribution of dots on said document, said printing, as a result of unanticipated unknowns in printing, causing an unpredictable variation, dot by dot, of at least one geometric characteristic of the printed dots and prior to said print step, a step generating said distribution of dots so that at least half the dots of said distribution are not laterally juxtaposed to four other dots of said dot distribution, and at least one dimension of at least one part of the dots of said distribution of dots is of the same order of magnitude as the average for the absolute value of said unpredictable variation. In embodiments, during the step generating the dot distribution, more than half the dots do not touch any other dot of said distribution. In embodiments, during the step of generating the dot distribution, dots are produced of which at least one geometric characteristic is variable, the geometric amplitude of the generated variation having the order of magnitude of the average dimension of at least one part of the dots.
Abstract:
The document identification method comprises: a step of generating an image, a step of marking a plurality of documents to form said image on each said document with unique variations on each document, the majority of the images formed on said documents presenting a physical anti-copy characteristic satisfying a pre-defined criterion such that said characteristic of the majority of the copies that can be produced based on these images do not satisfy said pre-defined criterion, a step of characterizing said variations to form a unique imprint of the mark formed, for each said document and a step of memorizing said unique imprint. In embodiments, said image only comprises two colors.In embodiments, during the step of characterizing variations, frequency analysis is utilized.In embodiments, during the step of memorizing, the imprint is stored in a database and/or the document is marked with a mark representing the imprint affixed individually on the document.
Abstract:
The document securization method includes: a step of printing a distribution of dots on the document, the printing, as a result of unanticipated unknowns in printing, causing an unpredictable variation, dot by dot, of at least one geometric characteristic of the printed dots and prior to the print step, a step of generating the distribution of dots so that dots of the distribution have at least one geometric characteristic that varies among dots, the geometric amplitude of the generated variation having the order of magnitude of the unpredictable variation. Preferably during the generation step, in the dot distribution: at least half the dots of the distribution are not laterally juxtaposed to four other dots of the dot distribution, and at least one dimension of at least one part of the dots of the dot distribution is of the same order of magnitude as the average for the absolute value of the unpredictable variation.