Attack detection method in a broadcast communication network comprising electronic and / or computer, and corresponding network

An attack detection method in a broadcast communication network comprising electronic and / or computer. It finds particular application embedded devices in a vehicle, such as an automobile, and networked. The network includes transmitting nodes and receivers 1-3 associated with said equipment, a communication bus 4 by diffusion adapted to convey information frames, each identified by a unique identifier, and grouped into sectors, the communication bus 4 connecting a hand, at least one transmitter node 1, 3 responsible for issuing, and capable of emitting, frames of one or more domains and, secondly, at least one receiver node 1, 2, 3 adapted to receive frames from one or more areas. Upon reception by a receiver node 1, 2, 3 gave a given frame in a given area, said receiver node 1, 2, 3 gave checks whether it has previously received a corresponding domain activation frame to domain a given B, from the sending node 1, 3 responsible for the area a, given B, and: - if it has received previously said field activation frame, accepts said given frame, - if n has not previously received said field activation frame, applies to said given filter frame.