the invention relates to a method for assigning an identity certificate transmitted by a vehicle to an object , which is detected by a sensor device in identification apparatus external to the vehicle . to this end , the identification apparatus receives the identity certificate , measures by means of the sensor device a first value relating to at least one operating parameter of the object , receives a second value of the vehicle relating to the at least one operating parameter and determined by the vehicle itself , compares the first value and the second value of each operating parameter with each other and assigns the identity certificate to the object if the two values for each operating parameter match .