a crankshaft 12 that converts the translational movement of the pistons 14 into a rotational movement a flywheel 16 couples the crankshaft 12 to a transmission 18 a positive locking transmission element 20 for example a chain a toothed belt or a gearwheel arrangement couples the crankshaft 12 to a camshaft 22 that mechanically actuates the valves 24 of the engine 10 that are associated with respective cylinders of the engine 10 actuating the engine 10 requires precise knowledge of the rotational position of the crankshaft 12 and the camshaft 22 so that the respective ignition instant for individual cylinders can be set in optimum fashion for example for this purpose a crankshaft sensor 26 which is arranged inside a transmission housing 28 and a camshaft sensor 30 which is arranged inside a cylinder head 32 are provided in addition an electrical throttle valve regulator 34 is provided for actuation in order to be able to regulate the amount of air and fuel that enters the cylinders the sensors 26 and 30 and the throttle valve regulator 34 use bus connections 36 to communicate with an engine controller 38 connected which in turn uses a gateway 40 to communicate with a can bus of the motor vehicle in order to allow secure communication between the devices connected to the bus 42 and at the same time to realize an immobilizer function the entire bus communication is encrypted fig3 shows an example of the structure of a data packet 44 in the bus communication the data packet 44 comprises the.