Process and arrangement for authenticating a user of facilities, a service, a database or a data network

A process for authenticating a user to control remote access to a service, data base or data network is provided, in which during an enrollment step, an initial voice sample provided by the user is analyzed to obtain an initial user-specific voice profile and, in a later verification step, a current voice sample of the user is analyzed and compared to the initial voice profile to generate an access control signal. An additional user-dedicated authentication is generated in a pre-enrollment period, and the additional authentication is used to authenticate the user in the enrollment step and/or in an access control step prior to and independent on the enrollment step, in a provisional or supplementary authentication procedure.