Abstract:
A control device controlling a device obtains a key that is supposed to be a public encryption key of a device recipient of data is to be transmitted in encrypted form. The control device obtains information derived from the public encryption key of the recipient device, and checks the obtained key, thanks to said information derived from the public encryption key of the recipient device. The control device authorises or prohibits the communication device from transmitting the data in encrypted form thanks to the obtained key, according to said checking.