A method for indicating authorized authentication media for a vehicle including detecting a key authorized for the vehicle via a first interface; ascertaining the authentication media that are authorized for the vehicle; and outputting an indication if, on the one hand, the key authorized for the vehicle was detected previously and if, on the other hand, at least one authentication medium was ascertained in the course of the ascertaining step, wherein the vehicle communicates with the authentication media via a second interface, which differs from the first interface. Also disclosed is a device and vehicle.