Method of transferring information between a subscriber identification module and a radiocommunication mobile terminal, and a corresponding subscriber identification module and mobile terminal

DETAILED DESCRIPTION The present invention aims to propose a solution to the above problem intended to make any kind of fraud so difficult that it becomes improbable.
To this end, the invention therefore consists in a method of transferring information between a subscriber identification module and a mobile terminal constituting a station of a radiocommunication system.
In accordance with the invention at least some of the information transferred between said module and said terminal is protected by encryption by means of a key used in said module and in said terminal.
The key is defined, at least in part, by periodically-varying data of the system.
In accordance with the invention, the periodically-varying data is a clock function specific to the radio-communication system.
Also, said key is preferably at least partly defined by other data specific to the mobile station.
The data defining said key is preferably combined in said module and in said terminal on the occasion of each transfer of information protected by encryption.
The invention also consists in a mobile terminal and a SIM card respectively adapted to apply said encrypted information transfer method.