Abstract: The invention relates to a method for performing a transaction with a system (1, 1A, 1B, 10) comprising a terminal (2) and a chip device (3), said system being configured to communicate to a user (6), during said transaction, transaction information from the terminal via an adapter (4), said adapter being configured to receive, by wire or wirelessly, said information (5) and to translate it into voice or another form, said information being obtained or collected in or via said chip device (3), characterized in that said chip device (3) is configured with a first communication interface with proximity radiofrequency or electrical (M3) contacts included in the device in order to receive the transaction information directly from a communication interface of the terminal. The invention also relates to the corresponding system.

Abstract: A computer-implemented method for managing a real-time clock having a drift and being embedded in a portable tamper-resistant device, which receives applicative data when performing a banking transaction with another device. comprises a step of extracting a time from the applicative data, the method also includes a step of compensating the drift by updating the real-time clock based on said time.

Abstract: The present invention relates to a method to generate prime numbers on board a portable device, said method comprising the steps of, each time at least one prime number is requested: when available, retrieve results from previously performed derivation calculation or, if not, select a start point for derivation; process derivation calculation to converge towards a prime number; if a prime number is found, store it and restart derivation calculation from a new start point; stop the derivation calculation after a predetermined amount of time; store intermediate results to be used a next time a prime number will be requested; output a stored prime number.

Abstract: The invention is a method of managing a real-time clock embedded in a portable tamper-resistant device that receives applicative data when performing a banking transaction with another device. The method comprises a step of extracting a time from the applicative data and a step of updating the real-time clock based on said time.

Abstract: The present invention relates to a method to generate prime numbers on board a portable device, said method comprising the steps of, each time at least one prime number is requested: when available, retrieve results from previously performed derivation calculation or, if not, select a start point for derivation; process derivation calculation to converge towards a prime number; if a prime number is found, store it and restart derivation calculation from a new start point; stop the derivation calculation after a predetermined amount of time; store intermediate results to be used a next time a prime number will be requested; output a stored prime number.

Abstract: The invention is a method for negotiating a parameter of an optical communication protocol between two devices. One device displays a first calibration image comprising a series of pixel patterns having a predetermined position and different sizes. The other device takes a first calibration picture of the first calibration image, identifies a set comprising at least one detectable pixel pattern in the first calibration picture and selects a setting data based on the set. Then it displays a second calibration image comprising this setting data which is read by the first device via another calibration picture. The first device retrieves the setting data from the calibration picture, selects a value based on the setting data and updates the parameter with the selected value.

Abstract: The invention is a method for negotiating a parameter of an optical communication protocol between two devices. One device displays a first calibration image comprising a series of pixel patterns having a predetermined position and different sizes. The other device takes a first calibration picture of the first calibration image, identifies a set comprising at least one detectable pixel pattern in the first calibration picture and selects a setting data based on the set. Then it displays a second calibration image comprising this setting data which is read by the first device via another calibration picture. The first device retrieves the setting data from the calibration picture, selects a value based on the setting data and updates the parameter with the selected value.

Abstract: The invention relates to a method for measuring audience data. The data is broadcast and received by at least one terminal. The data is relative to at least one channel included within the broadcast data. According to the invention, the terminal determines at least one piece of configuration data relating to at least one channel consumed by a terminal user, the at least one piece of configuration data comprising a first time difference between two time references, a first time reference relating to an exit from a channel and a second time reference relating to an access to the channel. The invention relates also to corresponding terminal and token.