Method and system for starting up or managing an offline control device

A method according to the invention for starting up and managing an offline control device (2), which comprises a management control unit (3) and a terminal (4) activating the management control unit (3), by means of a multi-factor/ID authentication comprises the following method steps for initial start-up of the control device (2): - implementing a multi-factor/ID authentication algorithm (6) in the terminal (4), - delivering the terminal (4), in a factory state, and a first storage medium (7), in which a storage medium ID and a first security code (5) are stored in a forgery-proof and globally unique manner, to a customer, - delivering a second security code (22), generated on the basis of the first security code (5), to a second storage medium (8) of the customer, - a user positioning the first and the second storage medium (7, 8) at the location of the terminal (4) and the terminal (4) reading the storage medium ID and the first and second security codes (5, 22) and checking offline, by means of the multi-factor authentication algorithm (6) of the terminal (4), whether the first and second security codes (5, 22) read are valid with each other, - following a positive multi-factor authentication check, storing the storage medium ID as authorisation ID and the first security code (5) in the terminal (4), and - terminating the initial start-up mode.