Abstract: Methods and systems are provided for anonymously tracking and/or analyzing flow or movement of individual subjects and/or objects using biometric data. A computer-implemented method enabling anonymous estimation of the amount and/or flow of individual subjects and/or objects, referred to as individuals, in a population moving and/or coinciding between two or more subject states using biometric data includes receiving identifying data, wherein the identifying data includes and/or is based on biometric data, from two or more individuals; generating, online and by one or more processors, an anonymized identifier for each individual; and storing: the anonymized identifier of each individual together with data representing a subject state; and/or a skew measure of such an anonymized identifier.

Abstract: There is provided a method and corresponding system for handling and/or generating anonymous biometric and/or behavioural data. The method comprises the steps of mapping (S1) biometric data originating from a subject into a biometric key using a one-way locality-sensitive hash function or receiving the biometric key. The method also comprises storing (S2) additional anonymous behavioural data bound to this key into an existing biometric trajectory in a database, wherein the behavioural data describes the user behavior of the subject. The method is performed to anonymize biometric data from a multitude of individuals, or subjects, per key, where each biometric key maps to biometric data of several subjects, and such a set of subjects resulting in the same biometric key is called a hash group, and a biometric trajectory is developed for each hash group.