Access control system and access control method for a people conveyor control system

A method for controlling access to a people conveyor control system, comprising the steps:

• providing an authentication proving device having a central processor unit and a read protected memory being protected from read and write access by external applications;
• storing in said read protected memory of said authentication proving device program code to carry out a verification procedure in response to a verification request, and to output a verification signal;
• sending a verification request from said people conveyor control system to said authentication proving device;
• in said authentication proving device, in response to said verification request, determining a verification signal, and sending said verification signal to said people conveyor control system;
• in said people conveyor control system, in response to said verification signal, selectively allowing or denying access to at least one of specific sections of said people conveyor control system and specific functions implemented in said people conveyor control system.