Methods and apparatuses for using certificates using a positive list are provided. This involves a message, wherein the message includes a certificate for a device, the certificate has a signature for checking an authenticity of the certificate and a piece of admissibility information for ascertaining an admissibility of the certificate using a positive list, being taken as a basis for carrying out authorization for the device subject to the check and the ascertainment. The disclosed can be used in industrial or medical environments.