Protection against detection warning signals

The invention relates to a communication method between at least one event detector sensor and an event detection data collector transmitted by the sensor as an event signaling message which the modulation is defined by the least one spreading code. The method comprises the steps implemented by the sensor on detection of an event, event detection data generating, for receiving a synchronization message transmitted by the collector, the synchronization message comprising a seed for a pseudo-random generation of at least one spreading code and pseudo-randomly generating at least a spreading code from the germ. The method further comprises a step of transmitting an event signaling message which the modulation is defined by the at least one spreading code randomly generated, the event signaling message including the detection data of event.