Abstract: The invention relates to a method for transmission of a secure virtual key (VK) from a server (50, S) to a mobile terminal (20, T) capable of communicating with the server (50, S), comprising the steps of: a) reception by the server (50, S) of a certification request from the mobile terminal (20, T), b) provision and downloading on the mobile terminal (20, T), by the server (50, S), of a user application (25), and c) provision of the mobile terminal (20, T), by the server (50, S), with a virtual key (VK), and d) downloading and securing of the virtual key (VK) in a security element (27) of the mobile terminal (20, T), characterised in that said security element is formed by an encrypting software environment (27).

Abstract: The invention relates to an electronics unit (11) to be fit in a vehicle (10) and designed to control a functionality of the vehicle (10) upon receipt of a request from a user terminal (20), characterized in that same comprises:—a memory unit designed to store a counter and data representing a duration;—means for periodically modifying the value of the counter, the period of time being equal to said duration;—control means for controlling said functionality only when the counter is within a given range of values. Also disclosed are a method carried out in an electronics unit of said type, a method for sharing a time frame between a server and an electronics unit, and a method for synchronizing a server and an electronics unit.

Abstract: The invention relates to an electronics unit (11) to be fit in a vehicle (10) and designed to control a functionality of the vehicle (10) upon receipt of a request from a user terminal (20), characterized in that same comprises:—a memory unit designed to store a counter and data representing a duration;—means for periodically modifying the value of the counter, the period of time being equal to said duration;—control means for controlling said functionality only when the counter is within a given range of values. Also disclosed are a method carried out in an electronics unit of said type, a method for sharing a time frame between a server and an electronics unit, and a method for synchronizing a server and an electronics unit.

Abstract: The invention relates to a method for transmission of a secure virtual key (VK) from a server (50, S) to a mobile terminal (20, T) capable of communicating with the server (50, S), comprising the steps of: a) reception by the server (50, S) of a certification request from the mobile terminal (20, T), b) provision and downloading on the mobile terminal (20, T), by the server (50, S), of a user application (25), and c) provision of the mobile terminal (20, T), by the server (50, S), with a virtual key (VK), and d) downloading and securing of the virtual key (VK) in a security element (27) of the mobile terminal (20, T), characterised in that said security element is formed by an encrypting software environment (27).