Abstract: A method for authenticating at least one piece of data during a payment transaction taking place between a merchant's communications terminal and a user device of the type including transmission, by the communications terminal, of at least one piece of data to be signed, to the user device by using a near field communications wireless data link. The method includes: obtaining the piece of data to be signed; obtaining an identifier of the communications terminal; signing, within a secured processing unit of the communications terminal, by using a key of the communications terminal, the piece of data to be signed and the identifier of the communications terminal, delivering signed pieces of data; transmission of the signed pieces of data to the user device; and reception, from the user device, of a piece of encrypted data establishing the authentication of the signed pieces of data.

Abstract: A method for securing the processing of transactional data is disclosed. The method is implemented within a communications terminal comprising a transactional data processing module. The method has: a step for the detection, by the processing module, of a display of at least one entry area relating to a piece of payment means data; a step for the activation, by the processing module, of a contactless data reading module; a step for the obtaining, by the contactless data reading module, of at least one piece of payment means data coming from a payment means; and a step for the furnishing, at said at least one entry area, of at least one piece of payment means data previously obtained.

Abstract: A method for encrypting a piece of payment means data is disclosed. This method is implemented by a payment means having a data processor. Such a method has at least one iteration of the following steps: obtaining a current piece of payment means data from a memory of the payment means; generating a following piece of payment means data as a function of the current piece of payment means data and as a function of an encryption key of the payment means; replacing the current piece of payment means data by the following piece of payment means data within the memory of the payment means.

Abstract: A method for controlling access to preliminarily identified computer resources is disclosed. The access is controlled so as to prevent the circumventing, by malicious applications, of barriers set up to prevent them from communicating when they are executed on one or more processors of an electronic device The method is implemented by an electronic device having access to the resources to be controlled. The method includes: receiving a request, coming from a program, for access to a current resource; obtaining at least one access parameter for access to the current resource within a resource-characterizing data structure; and modulating access to the current resource as a function of the at least one access parameter.

Abstract: A method is provided for managing a display of a view of an application, executed on a non-secured processor of an electronic data entry device that furthermore includes a secured processor. The application delivers at least one current view having a set of pixels to be displayed on a screen of the device. The managing is implemented under the control of the secured processor and includes: analysis of the current view, delivering at least one piece of data representing a presence of at least one suspect pattern; and, when a presence of a suspect pattern is detected within the current view, implementing by the secured processor at least one protection measure.

Abstract: A method of encryption of a message implemented by an electronic encryption device. The method includes: obtaining a current message; obtaining a current encryption key; determining, from a plurality of variants a basic encryption protocol, of a current variant of the encryption protocol; encrypting, by using the current variant and the encryption key, the message to be encrypted, delivering an encrypted message; and transmitting the encrypted key.

Abstract: A method for authenticating at least one piece of data during a payment transaction taking place between a merchant's communications terminal and a user device of the type including transmission, by the communications terminal, of at least one piece of data to be signed, to the user device by using a near field communications wireless data link. The method includes: obtaining the piece of data to be signed; obtaining an identifier of the communications terminal; signing, within a secured processing unit of the communications terminal, by using a key of the communications terminal, the piece of data to be signed and the identifier of the communications terminal, delivering signed pieces of data; transmission of the signed pieces of data to the user device; and reception, from the user device, of a piece of encrypted data establishing the authentication of the signed pieces of data.

Abstract: A method for authenticating data, implemented during a payment transaction between a merchant's communications terminal and a user device of the type including authentication by the communications terminal of at least one message generated by the user device, by using near field communications wireless data. The method includes the following acts by the user's device: obtaining an authentication code from the message, a piece of random data and a hash function; obtaining a first signature component from the message, the random piece of data, a public key of the communications terminal, a first private key of the user device and the authentication code; obtaining a second signature component from the message, the random piece of data, the public key of the communications terminal, a second private key of the user device and the authentication code; and transmitting the authentication code and of the two signature components to the communications terminal.

Abstract: The proposed technique relates to a method for securing a confirmation of a sequence of characters (SEQ) entered by a user on an electronic data entry device comprising an unsecured processor and a secured processor. This method, implemented in the secured processor, comprises determining a processing operation to be applied to said sequence of characters (SEQ), as a function of a signal (SIG_V) representing a confirmation, by the user, of the sequence of characters (SEQ), the signal (SIG_V) representing a confirmation being delivered by a confirmation means belonging to a set comprising at least two distinct confirmation means.

Abstract: A method for securing at least one memory zone of an electronic device. The method includes: detecting deallocation of at least one portion of the memory zone, a so-called deallocated portion; replacing at least one part of the deallocated portion with at least one predetermined instruction, a so-called warning instruction, or at least one combination of predetermined instructions, a so-called warning instruction combination; and marking the deallocated portion.

Abstract: A method is provided for processing data displayed on a screen of a multimedia kiosk, which has a contactless payment terminal. The method is implemented within the multimedia kiosk and includes detecting a presence of a user; and modifying, by using an interactive management module, a common advertisement message, broadcast by the multimedia kiosk, into a personalized advertisement.

Abstract: A method of encryption of a message implemented by an electronic encryption device. The method includes: obtaining a current message; obtaining a current encryption key; determining, from a plurality of variants a basic encryption protocol, of a current variant of the encryption protocol; encrypting, by using the current variant and the encryption key, the message to be encrypted, delivering an encrypted message; and transmitting the encrypted key.

Abstract: It is proposed a device and method for finding nilcatenations, and proposes nilcatenation detection techniques, which can be applied to blockchains, and even constitute a proof of useful work, as the periodic removal of nilcatenations keeps a ledger size as small as possible. Banks and blockchains need to keep track of an ever-increasing list of transactions between the accounts owned by their users. However, as time goes by, many of these transactions can be safely “forgotten”, in the sense that purging a set of transactions that compensate each other does not impact the network's semantic meaning i.e. the vector Bt of amounts representing the balances of users at a given point in time t. Nilcatenation refers to a collection of past transaction vectors having no effect on Bt. Removing these transactions yields a smaller, but equivalent set of transactions.

Abstract: A method of character recognition is implemented by an electronic device to recognize, in an image representing an object comprising at least one raised character, called a basic image, at least one raised character of the basic image. The method includes: a phase of processing at least one image, the phase including at least one implementation of a Phong reflection module and delivering at least one identification image; and a phase of identifying characters as a function of the basic image and the at least one identification image.

Abstract: The disclosure relates to a method for transmitting data and to a corresponding method for receiving data. According to the disclosure, in the method for transmitting data, a cryptographic processing operation is performed on the data to be transmitted, after this data has been pre-subdivided into blocks of data, and a tag representing each block of encrypted data is computed. The tag is then transmitted in such a way that a hacker in not able to reproduce a correct transmission of tags. The method of reception, for its part, ensures that when an incorrect tag is received (because of a hacking attempt), the processing of the data blocks is not immediately stopped but a differential processing is implemented in order to jam an attempt to analyze the behavior of the receiver.

Abstract: A method for authenticating data, implemented during a payment transaction between a merchant's communications terminal and a user device of the type including authentication by the communications terminal of at least one message generated by the user device, by using near field communications wireless data. The method includes the following acts by the user's device: obtaining an authentication code from the message, a piece of random data and a hash function; obtaining a first signature component from the message, the random piece of data, a public key of the communications terminal, a first private key of the user device and the authentication code; obtaining a second signature component from the message, the random piece of data, the public key of the communications terminal, a second private key of the user device and the authentication code; and transmitting the authentication code and of the two signature components to the communications terminal.

Abstract: A method for securing at least one memory zone of an electronic device. The method includes: detecting deallocation of at least one portion of the memory zone, a so-called deallocated portion; replacing at least one part of the deallocated portion with at least one predetermined instruction, a so-called warning instruction, or at least one combination of predetermined instructions, a so-called warning instruction combination; and marking the deallocated portion.

Abstract: A method is provided for processing data displayed on a screen of a multimedia kiosk, which has a contactless payment terminal. The method is implemented within the multimedia kiosk and includes detecting a presence of a user; and modifying, by using an interactive management module, a common advertisement message, broadcast by the multimedia kiosk, into a personalized advertisement.

Abstract: A method is provided for managing a display of a view of an application, executed on a non-secured processor of an electronic data entry device that furthermore includes a secured processor. The application delivers at least one current view having a set of pixels to be displayed on a screen of the device. The managing is implemented under the control of the secured processor and includes: analysis of the current view, delivering at least one piece of data representing a presence of at least one suspect pattern; and, when a presence of a suspect pattern is detected within the current view, implementing by the secured processor at least one protection measure.

Abstract: It is proposed a device and method for finding nilcatenations, and proposes nilcatenation detection techniques, which can be applied to blockchains, and even constitute a proof of useful work, as the periodic removal of nilcatenations keeps a ledger size as small as possible. Banks and blockchains need to keep track of an ever-increasing list of transactions between the accounts owned by their users. However, as time goes by, many of these transactions can be safely “forgotten”, in the sense that purging a set of transactions that compensate each other does not impact the network's semantic meaning i.e. the vector Bt of amounts representing the balances of users at a given point in time t. Nilcatenation refers to a collection of past transaction vectors having no effect on Bt. Removing these transactions yields a smaller, but equivalent set of transactions.