Thales

Adrien Duprez

Serge Hethuin

Eric Saliba

Philippe Painchault

Paul Gompel

Olivier Grisal

Stéphane Miquel

Thomas Bessou

Darius Ashtari

Delove Alexandre

Arnaud Tonnerre

A method for generating cryptographic half-keys makes it possible to generate n pairs (K, K), 1&#x2266;i&#x2266;n, of cryptographic half-keys, each of said pairs making it possible to reconstruct an access key Kspecific to a secure apparatus, said method comprising at least the following steps: generating and storing, with the help of a management center distinct from said apparatus, a first series of n half-keys Kon a recording medium; supplying the apparatus with said recording medium so as to generate, with the help of said local key Kand of the n half-keys Kstored on said medium, a second series of n half-keys Kmaking it possible to form said n pairs (K, K). The method applies notably to the creation of several keys for access to a secure apparatus.

Method for generating cryptographic half-keys, and associated system

The invention relates to a frequency hopping communication method in which the data travels over time-variable frequency bearers. A frequency bearer is defined as a subset pair of carriers in a channel of a set of frequency channels (RF). The choice of the frequency bearers is derived from a pseudo-random draw.

Strengthened frequency hopping communication method and device

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Paris, France

Adrien Duprez