Authenticating at least two Agricultural Devices Coupled via a Data Bus

The method involves coupling agricultural devices (10,11) to authentication device (12) through data bus (13) automatically and independently. The agricultural devices of authentication (14,15) are subjected to direct data exchange (18) or indirect data exchange (16,17) between successful authentication. The agricultural devices are operated, when data exchange is successfully authenticated. The agricultural devices are not operated, when data exchange is not successfully authenticated. An independent claim is included for an authentication device for authentication of agricultural devices.