Abstract: A method of secure communication between a computer server and users each having a connected computer system, comprising recording of a unique identifier of the server in the memory of a trusted server, the connected system having first and second digital communication modes, the method further comprising: the transmission of an ASC application to the connected system, the application being installed on the connected system, its execution controlling the automatic opening of a computer session with the trusted server according to the second digital communication mode, the opening of a communication session by the connected system with a server, the opening of a secured communication session by the server with the trusted server, the transmission by the server of an identifier of the connected system, the calculation by the trusted server of a time-stamped code associated with the key, the transmission of the time-stamped code by the trusted server to the connected system corresponding to the identifier transm