Abstract: A method for processing data from an input on a touch screen of an electronic terminal including an intermediate transactional server connection module, said method including: —receiving a random variable, from the intermediate transactional server via a secure link; —receiving, from a touch panel controller, coordinates of pressure on the touch panel; —transforming, via a transformation function fTs, the coordinates of pressure on the touch panel using the at least one datum representative of a random variable, thereby delivering a random character datum; —transmitting the datum representative of a random character to a verification terminal.

Abstract: A cryptographic data processing method for implementing a cryptographic function, implemented within an electronic data processing device including a processor, a memory and a set of cryptographic processing modules, the method including the following steps implemented by a current cryptographic processing module of the set: receiving incoming data; determining a decryption key to be applied to the incoming data according to a master key and a position of the current cryptographic processing module; decrypting the incoming data, with the key, delivering unencrypted incoming data; implementing at least one cryptographic operation on the unencrypted incoming data, delivering unencrypted outgoing data; optionally, determining a subsequent cryptographic processing module to be executed on the unencrypted outgoing data; obtaining an encryption key for the unencrypted outgoing data; encrypting the unencrypted outgoing data with the previously determined encryption key for the outgoing data, delivering the encrypted

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 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 present invention relates to a method to execute a modular exponentiation R=Xe mod N, said method implementing several variable registers and an indicator register m and performing looped calculations. In the invention each loop includes at least two operations from values stored in variable registers, said operations depending on the value stored in m and on the value of the bit(s) of the exponent currently processed, m indicating if the calculation is completed for the current exponent bit at the end of the operations in the current loop.