Ziegler, Jule AnnaSchmitz, DavidMüller, PaulNeumair, BernhardReiser, HelmutDreo Rodosek, Gabi2018-06-082018-06-082018978-3-88579-677-0https://dl.gi.de/handle/20.500.12116/16580In today’s diversity and heterogeneity of authentication protocols, standards, technologies and frameworks it is hard to compare or at all to combine, e.g., for multi factor authentication, different authentication scenarios. Above all, they all have different understanding or at least perspective on the term “service”. This perspective on a service is normally only a technically one, not really taking into account a full IT service covering the whole life cycle from design, (trust) negotiation, operation to decommissioning. This paper proposes a Universal Authentication Service Model (UASM) in order to describe authentication scenarios in a generic scenario-independent serviceoriented way. Requirements are derived from seven example authentication scenarios. It outlines theenText/Conference Paper1617-5468