Patent ID: 7532589

Claim:
A method of communication between elements of a same network for the control of home automation devices providing heating, ventilating, air conditioning, closing, lighting, or solar protection, each element comprising a memory in which one and the same mathematical mapping F is dependent on several variables and at least one key and communicating among themselves by virtue of one and the same authentication protocol, the method comprising the following steps: generation, by a first element O 1 , a single number N 1 ; calculation, in the first element O 1 , of a mathematical image R 11 of the single number N 1 via a mapping FK 11 which is itself a mathematical image via the mapping F contained in memory, of the key K 11 which the first element O 1 contains; transmission, by the first element O 1 , of a frame TG containing at least one command C 1 , the single number N 1 generated by the first element O 1 and its image R 1 ; reception of this frame TG, by at least a second element Oi; calculation, in the at least second element Oi, of a mathematical image R 1 i of the number N 1 generated by the first element O 1 via a mapping FK 1 i which is itself a mathematical image via the mapping F contained in memory, of the key K 1 i which the at least second element Oi contains; comparison, in the at least second element Oi, of the mathematical image R 1 i specific to the at least second element Oi with the mathematical image R 11 specific to the first element O 1 , and execution of the command C 1 by the at least second element Oi whose mathematical image R 1 i is equal to the mathematical image R 11 , wherein the key K 11 is shared by several elements of the network so that the at least one command can be executed by a single home automation device or by a group of home automation devices of the network.