Abstract: A method for generating a message signature intended to be validated by a verifier server. A client device is configured to hold a private key and a corresponding public key. The method includes offline pre-computation by a hardware security module of a signature token, a result of encryption using a homomorphic encryption function, storage of the signature token generation of the signature of the encrypted message by the homomorphic encryption function from the result of the encryption by the homomorphic encryption function of the private key stored by the client device, of the signature token and of the message. The signature is intended to be validated by the verifier server by the public key.

Abstract: The invention provides a method for detecting fraud (220) during biometric authentication of an individual comprising the acquisition (210), by an optical device, of a sequence of candidate images comprising at least two candidate images of an individual, with view to comparing said sequence with a reference image sequence comprising at least one reference image of an individual acquired during a preliminary enrollment step (100) by the same optical device, the method comprising the steps of: estimating (221), from the sequence of candidate images, the geometrical parameters of the optical device having acquired said sequence of candidate images on the individual, and comparing (222) said geometrical parameters with the geometrical parameters of the optical device having acquired the reference image sequence, and from the result of the comparison, determining (223, 224) whether the verification image sequence was acquired from at least one pre-recorded image of the individual.

Abstract: The invention relates to a method for securing an electronic device (SC) against attacks via covert channels when the electronic device (SC) implements a Montgomery ladder for calculating the element A?A?. . . ?A where A appears k times. A designates an element of an Abelian group with a law ?, and k is a natural number. The method comprises a modified implementation of the Montgomery ladder. The invention also relates to a device (SC), a computer program and a storage medium arranged so as to implement such a method.

Abstract: A method produces a matrix of pixels of a thermal sensor, suitable for passive addressing. The matrix of pixels includes a layer including a first series of electrically conducting strips, forming charge collection macro-electrodes; a layer including a pyroelectric material; and a layer including a second series of electrically conducting strips, forming heating strips. The method includes a step of transfer of one on the other of a first and a second elementary stack, the first elementary stack including the first series of strips, and the second elementary stack including the second series of strips. This method makes it possible to relax the manufacturing constraints of the series of strips.

Abstract: The present invention relates to a method for extracting morphological characteristics from a sample of biological material, in particular fingerprints, especially internal or external fingerprints, using an optical coherence tomography acquiring system delivering a signal representative of the sample, in which method an image containing intensity data and an image containing phase data are formed from at least the signal delivered by the acquiring system and representative of the sample, in order to extract the morphological characteristics from the sample.

Abstract: Method for detecting the presence of a body part carrying an imprint on an imprint sensor comprising a transparent face on which a body part must be placed, an image sensor, situated opposite the transparent face, able to acquire an image of an imprint, a light source for illuminating a body part placed on the transparent face. The method comprises: switching on the light source; acquiring a multicomponent image with the image sensor, each color component of the multicomponent sensor corresponding to a predefined wavelength range; obtaining, for each color component of said multicomponent image, information representing a signal generated by said image sensor for said color component; comparing said representative items of information with each other and detecting the presence of a body part according to the result of the comparison.

Abstract: A method of detecting zones liable to contain at least one finger print in an image of at least one portion of hand of an individual includes a step of acquiring the image, a step of determining a plurality of zones of the acquired image and a first selection step. The step of determining a plurality of zones determines that each zone is a continuous zone of points of the acquired image which each exhibit a luminous intensity level greater than or equal to a selected luminous intensity threshold value. The first selection step selects, from among the zones determined, the zones which are liable to represent at least one print of a finger.

Abstract: The invention relates to a method for biometric processing of images of part of the human body comprising at least one finger, said method being performed by a sensor, and wherein an emissive screen (1) displays at least one first display pattern to light said part of the human body and an imager (2) acquires at least one first image of said part of the human body; from this first image, the automated data-processing system determines at least one second display pattern different to the first display pattern; the emissive screen (1) displays at least the second pattern to light said part of the human body and the imager (2) acquires at least one second image of said part of the human body; a biometric processing being performed on a final image constructed from at least the second image.

Abstract: An image processor device includes a computer processor unit (CPU), at least one memory connected to the CPU, and device for transferring images to the CPU. The memory contains an image-processing program for processing images showing at least one person. The program performs the following operations: detecting at least a face in each image and extracting therefrom a biometric template of the face; for each image, storing in a database an image reference, the biometric template, and if possible context information for the image; comparing the biometric templates corresponding to different image references with one another and associating together the image references for which the comparison has a similarity score greater than a predetermined threshold; and searching for context information corresponding to at least one of the references of the associated images, and if there is corresponding context information, establishing a link between the associated images.

Abstract: A method for determining a point spread function of an imaging system. The method includes: for each position in a plurality of positions of a target in an optical field of said imaging system: acquiring an image of the target, referred to as the real image; obtaining a synthetic image of the target representing a digital model of the target adjusted to a zone of the real image corresponding to the target so that said model coincides with said zone; estimating the point spread function using the real image and the synthetic image; and calculating an optical transfer function by applying a Fourier transform to the point spread function; calculating an average optical transfer function from the optical transfer functions calculated for each position in the plurality of positions; and obtaining an average point spread function by applying an inverse Fourier transform to the average optical transfer function.

Abstract: The invention relates to a method for generating a three-dimensional facial model the shape of which can changed on the basis of a plurality of images of faces of persons, including the steps that involve: generating a facial template; acquiring shapes from examples of faces of persons; repeatedly changing the shape of the template for each example of a face of a person, so that the shape of the changed template corresponds to the shape of the face example, and determining the change in shape between the initial template and the changed template; and generating the facial model as a linear combination of the shape of the template and the changes in shape between the initial template and the changed template, for each example of a face of a person. The invention also relates to a method for processing an image of a face of a person such as to generate a three-dimensional image of the face of the person from of said deformable model.

Abstract: A biometric identification method of an entity including computation of a matching value between biometric data of an entity u and reference biometric data u?, by application of a function F to the biometric data. A non-interactive, publicly verifiable computation method is performed wherein representation of the function is obtained by converting an arithmetic circuit into a polynomial representation. A matching value is obtained by evaluating the arithmetic circuit and the reference biometric data as inputs. Proof of correction of the computation execution of the matching values is obtained. Verification of said received proof. The function is encoded with an integer k>1 of a vector of a biometric datum on at least one input wire of the circuit. The function includes at least m scalar products. Evaluation of the circuit is iteratively computed depending on the value of m.

Abstract: The invention relates to a method for processing an image comprising a set of pixels, each pixel being associated with a grey level, the method comprising a step of segmentation of the image to generate a modified image only containing regions of the image having an alternation of bright zones and dark zones at a frequency greater than a minimum frequency, said step of segmentation comprising: the allocation, to each pixel of the image, of a frequency response level, corresponding to a frequency of alternations of bright zones and dark zones in the vicinity of the pixel, the definition of regions of the image by grouping together neighboring pixels of same frequency response level, the determination of a threshold frequency response level, and the generation of an image only comprising regions of which the pixels have a frequency response level greater than or equal to the threshold frequency response level.

Abstract: The invention relates to a method for detecting fraud to authenticate that an object is a human finger from a three-dimensional representation of said object comprising a set of representation points (3) modeling at least a part of the surface of the object, comprising the following steps: a) determining at least one principal plane (P) comprising a principal axis in the longitudinal direction of the three-dimensional representation of the object, said principal plane (P) intersecting the representation (1) of the surface of the object along at least one intersection zone, b) for each principal plane (P), determining a set of working points (5) from representation points (3) at the intersection zone, c) validation that the object is a human finger by implementing a validation process on the position of the working points.

Abstract: Applets (AA1, AB1) are developed in object-oriented language and compiled in bytecode. A software firewall of an operating system installed in an electronic component of the iUICC type or on an electronic card of the eUICC type checks execution thereof. The operating system comprises an interpreter interpreting and executing the bytecode of the applets (AA1, AB1), each applet (AA1, AB1) being associated with a single context (CA1, CB1, JB), each context (CA1, CB1, JB) being associated with one or more applets. In addition, each context (CA1, CB1, JB) is associated with a single use profile (PA, PB) among a plurality of use profiles, and each use profile (PA, PB) is associated with one or more contexts (CA1, CB1, JB).

Abstract: A pyroelectric sensor includes several pixels distributed above a substrate and each pixel includes a first portion made of a pyroelectric material, in direct physical contact with a charge collection electrode, a second portion made of a pyroelectric material, in direct physical contact with a charge collection electrode, the first portion, the second portion and the at least one charge collection electrode being superposed above the substrate, at least one heating element to heat the first and second portions including a pyroelectric material, and an electronic device to measure a difference between charges generated by the first portion including a pyroelectric material and charges generated by the second portion including a pyroelectric material. The pyroelectric sensor makes it possible to suppress a useless part of a measurement signal. It is particularly advantageous for taking an image of a papillary print.

Abstract: The tracking method comprises, for at least a first image of the text having at least a first line of characters: applying a prediction of a movement to which the text is subjected between the first image and a second image of the video stream, the movement prediction being applied to at least one second line of characters of the second image; determining at least one alignment hypothesis for aligning the first line with the second line after applying the movement prediction; estimating for each alignment hypothesis, a geometrical transformation between the first line and the second line resulting in that alignment; and evaluating a character match metric for each alignment hypothesis, the metric being evaluated from signatures calculated on the characters of at least one line of the first image and signatures calculated on the characters of at least one line of the second image put into correspondence with the characters of said at least one line of the first image after applying the geometrical transform

Abstract: A control method is provided. The method includes, before the individual or group of individuals presents at the control point, initializing a control protocol of each individual, including retrieving freshly acquired biometric datum from each individual; extracting metadata associated with each datum; verifying the coherence of the extracted metadata; and comparing each freshly acquired biometric datum retrieved with a set of biometric reference data stored in a control server, so as to ascertain whether a controlled individual belongs to a list of individuals of interest; and when the individual or group of individuals presents at the control point: finalizing the control protocol of each individual and if either authentication and/or verification fails, subjecting the individual or the group of individuals to more intense scrutiny, and if both authentication and verification pass, authorizing the individual or the group of individuals to cross the control point.

Abstract: The invention relates to an electronic card comprising a card body (1) comprising an upper surface (11) and a lower surface (12); a fingerprint sensor (2) flush with the upper surface of said card body; a tactile mark (3) placed on the upper surface of the card body near the fingerprint sensor, said tactile mark having an excess thickness from the upper surface of the card to guide, when said mark is touched, a correct positioning of a finger on said fingerprint sensor, the thickness of the tactile mark being such that the card has a thickness compatible with standard ISO 781 ID1, the thickness of the tactile mark preferably being between 30 and 60 ?m, typically 50 ?m.

Abstract: Method for detecting attempted fraud by using an artificial material during a biometric acquisition, including: illuminating, with lighting, a surface of an object having a texture, acquiring a first image of the surface; illuminating, with non-uniform lighting, the surface and acquiring a second image of the surface, the non-uniform lighting causing light to diffuse within the illuminated material at an intensity that varies according to a law that is a function of a first position parameter and is invariable along a second position parameter; computing a correction, varying along the first position parameter, that is to be locally applied to the first image to bring the amplitude of the texture on the first image substantially to the level of that on the second image; generating, on the basis of the correction, information relating to the artificial or non-artificial nature of the material.