1. A generator of chaotic sequences e u (n), n being a strictly positive integer, of integer values represented on a determined number of quantification bits N, to form data encrypting keys, the generator comprising: at least two discrete recursive filters at least of first-order generating an output chaotic sequence of integer values, each recursive filter comprising means for implementing a nonlinear function F, connected via an exclusive-or gate to means for generating a perturbation sequence Q(n) of integer values represented on a determined number of quantification bits k, wherein the two filters are mounted in parallel, the chaotic sequence e u (n) output from the generator being equal to an exclusive-or of the chaotic sequences output from the recursive filters, and wherein the means for implementing the nonlinear function includes a chaotic map.