| 摘要 |
The subject of the present invention is a method providing the means making it possible to recognize the origin and/or content of an RF signal without requiring substantial means of calculation, these recognition means being accessible only to authorized persons and being practically non-modifiable and very difficult to detect by unauthorized persons, this being the case in various applications implementing RF signals transmitting information that is at least in part hidden. This method is characterized in that it spreads an item of information to be hidden with the aid of a hidden code, and the information thus obtained is distributed with the aid of an Exclusive OR function in codes which are known with the aid of a hidden distribution algorithm, in that on reception the inverse algorithm to that which served for distribution is implemented so as to access the spread code, and in that this spread code is correlated with the hidden code so as to retrieve the hidden item of information. |
