Abstract: A device, in particular for a biological sample grinding apparatus, comprising a first enclosure comprising an internal chamber intended to receive a material capable of producing cold by sublimation under normal temperature and pressure conditions and comprising an opening making it possible for a fluidic communication with an internal chamber of a second enclosure through an opening of it. The device further comprising an air circuit making the outside air communicate with the internal chamber of the first enclosure, a blasting module making it possible for an air circulation in the air circuit from the outside up into the internal chamber of the first enclosure.

Abstract: Generation of one dimensional guilloche patterns able to be affixed on a document, each guilloche pattern being able to encode variable alphanumeric data providing a different appearance to each guilloche pattern, by formatting alphanumeric data to be encoded in the form of a predefined number of data blocks with a predefined size, generating a carrier function having a plurality of parameters, the formatted data blocks forming at least one of the parameters, and modulating the carrier function by the formatted data blocks so as to encode the alphanumeric data graphically, each data block defining a guilloche pattern, the number of data blocks defining the number of guilloche patterns, the carrier function associated with a formatted data block is modulated locally, each datum of the block being encoded locally in the guilloche pattern, by interpolation of a predefined point associated with the carrier function.

Abstract: Disclosed is a method for authenticating and/or checking the integrity of a subject, including:—visually superimposing, optically or electronically:—at least one so-called authentication image of at least one authentication region of an authentic subject, the authentication image including at least one texture of random composition,—and, also, the authentication region per se of a candidate subject or at least one verification image of the authentication region of the candidate subject,—in the event of observing, on the image resulting from the superimposition, a Glass pattern optical phenomenon in the authentication region, concluding that the candidate subject is the authentic subject and/or the at least partial integrity of the authentication region of the authentic subject.

Abstract: Disclosed is a method for determining a relational imprint between two images including the following steps: —the implementation of a first image and of a second image, —a phase of calculating vectors of similarity between tiles belonging respectively to the first and second images, the similarity vectors forming a field of imprint vectors, the field of imprint vectors including at least one haphazard region disordered in the sense of an entropy criterion, —a phase of recording in the guise of relational imprint of a representation of the calculated field of imprint vectors. Also disclosed is a method for authenticating a candidate image with respect to an authentic image implementing the method for determining a relational imprint.

Abstract: Generation of one dimensional guilloche patterns able to be affixed on a document, each guilloche pattern being able to encode variable alphanumeric data providing a different appearance to each guilloche pattern, by formatting alphanumeric data to be encoded in the form of a predefined number of data blocks with a predefined size, generating a carrier function having a plurality of parameters, the formatted data blocks forming at least one of the parameters, and modulating the carrier function by the formatted data blocks so as to encode the alphanumeric data graphically, each data block defining a guilloche pattern, the number of data blocks defining the number of guilloche patterns, the carrier function associated with a formatted data block is modulated locally, each datum of the block being encoded locally in the guilloche pattern, by interpolation of a predefined point associated with the carrier function.

Abstract: Disclosed is a method for determining a relational imprint between two images including the following steps: —the implementation of a first image and of a second image, —a phase of calculating vectors of similarity between tiles belonging respectively to the first and second images, the similarity vectors forming a field of imprint vectors, the field of imprint vectors including at least one haphazard region disordered in the sense of an entropy criterion, —a phase of recording in the guise of relational imprint of a representation of the calculated field of imprint vectors. Also disclosed is a method for authenticating a candidate image with respect to an authentic image implementing the method for determining a relational imprint.

Abstract: Disclosed is a method for authenticating and/or checking the integrity of a subject, including:—visually superimposing, optically or electronically:—at least one so-called authentication image of at least one authentication region of an authentic subject, the authentication image including at least one texture of random composition,—and, also, the authentication region per se of a candidate subject or at least one verification image of the authentication region of the candidate subject,—in the event of observing, on the image resulting from the superimposition, a Glass pattern optical phenomenon in the authentication region, concluding that the candidate subject is the authentic subject and/or the at least partial integrity of the authentication region of the authentic subject.

Abstract: A method for authenticating a security element by superimposing N shared colour images in order to obtain at least one target colour may include a phase of constructing an authenticator system that includes a step of selecting a target colour; a step of selecting a series of N decomposition colours which, by means of superimposition, together enable the target colour to be obtained; and a step of recording the N shared images each with a decomposition colour from the series. A security element comprising at least one shared image may be obtained according to the method.

Abstract: The present invention concerns a method for extracting a random signature from a subject material element, comprising: a phase to generate at least one acquisition vector of structural characteristics of at least one region of the subject material element, a phase to generate at least one random signature vector from the acquisition vector, the random signature vector comprising: at least one random component having a stable nature so that its value may be found on each implementation of the method on one same region of the subject material element, and/or at least one random component having an unstable nature so that its value is likely to vary random fashion on each implementation of the method on one same region of the subject material element, use of the random signature vector as random signature.

Abstract: The invention concerns a unitary authentication process of a material object consisting of a construction phase of an authenticator system comprising at least: a message image selection step; a support image selection step; a message and support images transformation step to generate at least two shared images according to a transformation process implementing at least a random sequence, the message image not being accessible in each shared image taken individually; a recording step of at least one shared image. According to the invention, in the construction phase of an authenticator each random sequence, the so-called material signature, is extracted or generated from at least one structural characteristic of at least one region of the material object and is liable to be generated on request and obtained identically from the material object.

Abstract: The present invention concerns a method for extracting a random signature from a subject material element, comprising: a phase to generate at least one acquisition vector of structural characteristics of at least one region of the subject material element, a phase to generate at least one random signature vector from the acquisition vector, the random signature vector comprising: at least one random component having a stable nature so that its value may be found on each implementation of the method on one same region of the subject material element, and/or at least one random component having an unstable nature so that its value is likely to vary random fashion on each implementation of the method on one same region of the subject material element, use of the random signature vector as random signature.

Abstract: The present invention concerns a method for extracting a random signature from a subject material element, comprising: a phase to generate at least one acquisition vector of structural characteristics of at least one region of the subject material element, a phase to generate at least one random signature vector from the acquisition vector, the random signature vector comprising: at least one random component having a stable nature so that its value may be found on each implementation of the method on one same region of the subject material element, and/or at least one random component having an unstable nature so that its value is likely to vary random fashion on each implementation of the method on one same region of the subject material element, use of the random signature vector as random signature.

Abstract: The present invention concerns a method for extracting a random signature from a subject material element, comprising: a phase to generate at least one acquisition vector of structural characteristics of at least one region of the subject material element, a phase to generate at least one random signature vector from the acquisition vector, the random signature vector comprising: at least one random component having a stable nature so that its value may be found on each implementation of the method on one same region of the subject material element, and/or at least one random component having an unstable nature so that its value is likely to vary random fashion on each implementation of the method on one same region of the subject material element, use of the random signature vector as random signature.