A method for routing at least one message, this method being implementation-dependent on a trusted operating system of an electronic device comprising an electronic assembly on which the trusted operating system and a Rich-OS operating system are executed. The method may include operations for consulting a trusted memory of a terminal, which may be called a first memory, and when the first memory contains a message, determining the operating system targeted by the message from among at least the Rich-OS operating system and the trusted operating system. And when the message targets the Rich-OS system, transferring the message from the first memory to a memory accessible to the Rich-OS system, which may be called a second memory.