Method for managing access authorizations in a locking system comprising a plurality of access control devices, an access control center designed as an electronic computing unit, and a plurality of electronic identification media, - wherein a central database is maintained in the access control center in which details of the identification media and authorization information assigned thereto are stored, - wherein the database also contains a blacklist of identification media that have had authorizations revoked, - wherein identification media are programmed with the respective assigned authorization information and the authorization information is queried in the course of an access request by means of electronic data communication between the access control device and the identification medium, - wherein the access control devices are programmed with the black list, - wherein the programming of the access control devices comprises the transfer of the black list from the access control center to at least one identification medium and, in the course of an access request, from the identification medium to the access control device, - wherein the central database further stores status data of the access control devices, the status data including information about the remaining capacity of an energy storage of the access control device, information about the stored blacklist and/or access events, - wherein the status data is transferred from the access control device to the identification medium or to a separate programming device, if necessary in the course of an access authorization query, and is subsequently written to the central database by reading out the identification medium or the programming device, respectively, - wherein a unique version number is assigned to the blacklist stored in the central database, wherein a new version number is assigned to the blacklist when it is updated, and that the access control devices are programmed with the most current blacklist together with the assigned version number, characterized in that - the status data comprises information about the version number of the black list stored in the access control device and an evaluation of the version numbers of the black list contained in the status data is performed in the access control center, - wherein programming the access control devices with the most current black list comprises forming difference data representing the update, to which the version number corresponding to the update is assigned, and in that the access control devices are programmed only with the difference data and the assigned version number. - wherein a central database is maintained in the access control center in which details of the identification media and authorization information assigned thereto are stored, - wherein the database also contains a blacklist of identification media that have had authorizations revoked, - wherein identification media are programmed with the respective assigned authorization information and the authorization information is queried in the course of an access request by means of electronic data communication between the access control device and the identification medium, - wherein the access control devices are programmed with the black list, - wherein the programming of the access control devices comprises the transfer of the black list from the access control center to at least one identification medium and, in the course of an access request, from the identification medium to the access control device, - wherein the central database further stores status data of the access control devices, the status data including information about the remaining capacity of an energy storage of the access control device, information about the stored blacklist and/or access events, - wherein the status data is transferred from the access control device to the identification medium or to a separate programming device, if necessary in the course of an access authorization query, and is subsequently written to the central database by reading out the identification medium or the programming device, respectively, - wherein a unique version number is assigned to the blacklist stored in the central database, wherein a new version number is assigned to the blacklist when it is updated, and that the access control devices are programmed with the most current blacklist together with the assigned version number, characterized in that - the status data comprises information about the version number of the black list stored in the access control device and an evaluation of the version numbers of the black list contained in the status data is performed in the access control center, - wherein programming the access control devices with the most current black list comprises forming difference data representing the update, to which the version number corresponding to the update is assigned, and in that the access control devices are programmed only with the difference data and the assigned version number.