The disclosure relates to a method for providing an access code on a portable device, which comprises a user interface and is set up for a wireless data communication, in which reference data for an authentication are stored in a central data processing system, wherein the reference data comprise personal data containing biometric reference data for a user of the portable device and a device identifier for the portable device, in response to a detected event, an authentication process is executed, in which the user is authenticated, wherein to authenticate the user, in the central data processing system and/or in the portable device, the reference data and authentication data are evaluated, which comprise personal authentication data for the user, including biometric authentication data, and an authentication device identifier for the portable device, and in response to a successful authentication, an access code is provided in the portable.