METHOD OF SENDING DATA FROM A MOTOR VEHICLE AND METHOD OF RECEIVING SUCH DATA BY ANOTHER VEHICLE, THROUGH A RADIO COMMUNICATION CHANNEL.

摘要

The transmission method comprises a step of obtaining by said vehicle (A) from a distribution entity (BO) a plurality of series of numbers each containing a base gi, a prime number pi, a first key Zi , with Zi = gizi modulo pi, where zi is a secret number, an associated validity number Vi, and stores the N series of numbers in memory; a step (E20) of generating a random number a; a step (E22) of calculating a second KaZi key where KaZi = Zia modulo pi ;; a step (E23) for creating a message M, during which the vehicle A inserts the validity number Vi in said message M; the second group of numbers a, pi and gi encrypted using the first key Zi, in a header of the message, and the data data, in a body of the message; and performs a cryptographic operation on said message M using the second KaZi key; and a step (E24) of sending the message M created by the vehicle (A) through a radio communication channel.