A method of authenticating data packets transmitted by terminals and received by a station, each terminal successively transmitting data packets in a plurality of different frequency bands according to a frequency hop sequence specific to said terminal, includes, for a data packet received by the station, i) measuring the frequency band in which the considered data packet has been received, ii) extracting an identification code from said considered data packet, iii) determining a theoretical frequency hop according to the frequency hop sequence associated with said extracted identification code, and iv) calculating a frequency hop deviation according to the theoretical frequency hop and to the frequency bands measured for the considered data packet and for the previous data packet. The authentication method includes determining whether data packets have been transmitted by the terminal associated with this identification code according to at least one frequency hop deviation.