Abstract: Disclosed is a method of authorizing a user for accessing a server and/or for receiving of an on-line service and the steps of: capturing biometric data of the user using the sensor on a ME; forming from the biometric data a biometric template on the IDS and storing the biometric template on the MED; and via the IDS allowing access to a server by the user providing to the IDS, via the MED, matching biometric data and a biometric template. On the MED, a local check can be made for a match between biometric data of the user that are captured using the sensor on the MED and biometric data read out of the memory.

Abstract: A method for checking a confidence level associated with a first user account of an online service, each user account including associated user data and contact means, the method includes the steps of selecting at least one second user account, generating a first code, recording the first code in association with the first user account, sending a first message via a contact means associated with the second user account, the first message including the first code generated and, in subsequent steps, of receiving, from a first electronic device connected to the online service with the first user account, a second message including a second code and, when the second code is equal to the first code recorded in association with the first user account, then increasing the value of the parameter indicating the confidence level associated with the first user account of the online service.

Abstract: Disclosed is a method of authorizing a user for accessing a server and/or for receiving of an on-line service and the steps of: capturing biometric data of the user using the sensor on a ME; forming from the biometric data a biometric template on the IDS and storing the biometric template on the MED; and via the IDS allowing access to a server by the user providing to the IDS, via the MED, matching biometric data and a biometric template. On the MED, a local check can be made for a match between biometric data of the user that are captured using the sensor on the MED and biometric data read out of the memory.

Abstract: The present invention concerns a method for redacting an original document consisting of a matrix of pixels each defined by a vector having at least one numerical value, the method comprising implementation by data processing means (11) of equipment (1), of steps of: (a) Determining a set of pixels of said matrix corresponding to one or more areas to be blacked-out from the original document; (b) Generating a final document corresponding to the original document in which the vectors defining the pixels of said selected set are replaced by an arbitrary vector; (c) Generating a zero-knowledge proof of the fact that the pixel matrixes of the original document and of the final document only differ via pixels belonging to said selected set. The present invention also concerns a method for verifying the authenticity of a final document.

Abstract: The invention relates to an authentication method for authenticating a client device having an authentication token generated by means of a pseudo-homomorphic function and based on a secret element (PIN) known only by the client device, to a server, comprising: the generation (A1), by the client device, of proof of knowledge of the secret element based on a proof generation key masked with a first mask data item, said masked proof generation key being dependent on said secret element, the transmission to the server by the client device, of said generated proof of knowledge of the secret element (A2) and of the authentication token (J) masked using the mask data item (A3), the verification of the validity of the masked authentication token (A4) and of the validity of the proof of knowledge by the server (A6) by a zero-knowledge proof, proving the knowledge of said secret element by the client device without revealing it.

Abstract: The present invention concerns a method for redacting an original document consisting of a matrix of pixels each defined by a vector having at least one numerical value, the method comprising implementation by data processing means (11) of equipment (1), of steps of: (a) Determining a set of pixels of said matrix corresponding to one or more areas to be blacked-out from the original document; (b) Generating a final document corresponding to the original document in which the vectors defining the pixels of said selected set are replaced by an arbitrary vector; (c) Generating a zero-knowledge proof of the fact that the pixel matrixes of the original document and of the final document only differ via pixels belonging to said selected set. The present invention also concerns a method for verifying the authenticity of a final document.

Abstract: The present invention concerns a method of generating a biometric certificate of a user performed by a data processing device of a certifying authority, comprising a step of generating (E4) a certificate for said user comprising data related to the identity of the user and truncated authentication data of said user generated using a method of generating a biometric authentication datum, comprising steps of: acquiring (E1) first biometric data of said user; generating (E2) a first a proof of knowledge of said first biometric data from the first acquired biometric data and from a pseudo-random function; generating (E3) a first truncated authentication datum by applying a truncation function to said first generated proof of knowledge.

Abstract: The invention concerns a method for generating an electronic signature key and an associated public key certificate, implemented by a client unit and a server unit, the method comprising a step during which the client unit and/or the server unit generate(s) a signature key comprising a private key and a public key, and a public key certificate comprising said public key, the method being characterized in that the client unit acquires an item of biometric data of an individual, and in that the signature key and/or the public key certificate are generated from at least a portion of said biometric data, and in that the portion of biometric metric data from which the signature key and/or the public key certificate have been generated is ephemeral and is not memorized after the signature key and the public key certificate have been generated. The invention also concerns a method for transferring a message and a system designed to implement the method for generating a signature key.

Abstract: The present invention concerns a method of generating a biometric certificate of a user performed by a data processing device of a certifying authority, comprising a step of generating (E4) a certificate for said user comprising data related to the identity of the user and truncated authentication data of said user generated using a method of generating a biometric authentication datum, comprising steps of: acquiring (E1) first biometric data of said user; generating (E2) a first a proof of knowledge of said first biometric data from the first acquired biometric data and from a pseudo-random function; generating (E3) a first truncated authentication datum by applying a truncation function to said first generated proof of knowledge.

Abstract: The invention relates to an authentication method for authenticating a client device having an authentication token generated by means of a pseudo-homomorphic function and based on a secret element (PIN) known only by the client device, to a server, comprising: the generation (A1), by the client device, of proof of knowledge of the secret element based on a proof generation key masked with a first mask data item, said masked proof generation key being dependent on said secret element, the transmission to the server by the client device, of said generated proof of knowledge of the secret element (A2) and of the authentication token (J) masked using the mask data item (A3), the verification of the validity of the masked authentication token (A4) and of the validity of the proof of knowledge by the server (A6) by a zero-knowledge proof, proving the knowledge of said secret element by the client device without revealing it.

Abstract: The invention concerns a method for generating an electronic signature key and an associated public key certificate, implemented by a client unit and a server unit, the method comprising a step during which the client unit and/or the server unit generate(s) a signature key comprising a private key and a public key, and a public key certificate comprising said public key, the method being characterised in that the client unit acquires an item of biometric data of an individual, and in that the signature key and/or the public key certificate are generated from at least a portion of said biometric data, and in that the portion of biometric metric data from which the signature key and/or the public key certificate have been generated is ephemeral and is not memorised after the signature key and the public key certificate have been generated. The invention also concerns a method for transferring a message and a system designed to implement the method for generating a signature key.