Access control system

This comprises a control centre (1) via which, in a coded means of key and user identification (2) an identifying code of the means themselves, an identifying code of the user, a first set of information referring to opening operations permitted in reading means (3) for permitting access, a third set of information referring to invalidated means (2) and a second set of information, provided by reading means (3) corresponding to the different openings performed are recorded. It avoids connection between the control centre (1) and the reading means (3) with the means (2) constituting the communication means between them.