How do enrolment and biometric authentication work?
A prerequisite for authentication is enrolment, in which the biometric features are saved as a personal reference either decentrally on a chip card or PC, or centrally in a data base. Since the quality of the enrolment essentially determines the performance of the authentication, it must be implemented carefully. It is obvious that enrolment must take place in a trustworthy environment. During an authentication, a new scanning of the biometric characteristic is required. This time it is not saved; instead, it is compared to the biometric reference(s). If the comparison shows sufficient similarity, for example, access to the appropriate applications can be granted. Most biometric systems show the following procedure in detail: • Capturing a data set (e.g., image or sound, called biometric sample) which includes the biometric features to be extracted using an appropriate biometric capture device incl.
