Patent ID: 7370201

Claim:
A process for secure recognition between two units of a radiofrequency network, comprising the following steps: (a) switching on said two units, (b) selecting one of said two units as a master unit, and the other unit as a slave unit, (c) moving said two units into immediate proximity with one another, (d) launching on said master unit an automatic secure recognition process, as follows: (d1) transmitting signals, using a first radiation pattern of limited coverage, in such a way that the signals transmitted by the masterunit are only received by said slave unit, (d2) launching a standard connection process to said radiofrequency network and, in the case of successful connection to said radiofrequency network, (d3) generating a recognition key in one of said units for subsequent secure exchanges between said two units, and (d4) transmitting said recognition key from said one unit to the other of said units; (e) moving said two units at a distance from each other for operation at a distance larger than the immediate proximity; and (f) thereafter transmitting secure signals between said master unit and said slave unit, using said recognition key, by means of a second radiation pattern having a range of coverage larger than said first radiation pattern.