A method for controlling a generation of at least one access code includes receiving, in an access control device, data representing an access code; verifying the data representing the access code; in response to a detection in a verification that the access code is valid generating a signal causing a generation of data representing a new access code; and generating a signal causing a transmit of the data representing the new access code to a party from whom the data representing the access code is received. An access control device, a computer program product and a system are also disclosed.