Method for making secure a stream of data

The invention relates to a method for making secure a communication interface (4) between a first transmitter/receiver device (2) and a second transmitter/receiver device (6) exchanging data via said interface (4). This method comprises the following steps: - defining an integer N of distinct communication channels Ci, i=1 to N, between said first and second terminals (2, 6), - cutting said data into a number M of data segments Dj, j=1 to M, - assigning to each data segment Dj at least one communication channel Ci and a transmission rank rj of said segment via said channel according to a distribution procedure programmed to run in the first device (2) and in the second device (6), transferring each data segment Dj from the first (2) (respectively second (6) ) device to the second (6) (respectively first (2)) device via said channel Ci and according to said rank rj.