Abstract-Band - Fakultät für Informatik, TU Wien - Technische ...

Plattformen aufgearbeitet. Nach Definitionen für die einzelnen Ebenen im E-
Learning werden besonders die Einflussfaktoren bei der Gestaltung von E-
Learning Plattformen erörtert. Des Weiteren werden wichtige Erfolgsfaktoren
für die Gestaltung einer E-Learning Plattform aufgezeigt. Danach wird auf jene
Funktionalitäten und deren lerntheoretische Anwendung von Moodle eingegangen,
die in der konzeptionellen Umsetzung für die Lehrveransaltung
Technische Grundlagen der Informatik Einsatz finden. Die konkrete Umsetzung
des Konzepts erfolgt als TUWEL-Testkurs, der Einsatz von Bestandteilen obliegt
der Verantwortung der Lehrveranstaltungsleitung.
Gregor Ryba
Authorization as a Service - Evaluating the Platform as a Service Paradigm for
XACML Policy Decision Points
Studium: Masterstudium Software Engineering & Internet Computing
BetreuerIn: Ao.Univ.Prof. Dr. Wolfgang Kastner
The "Internet of Things" vision refers to an Internet that is not completely
dependent on humans creating information. It tries to incorporate the physical
world with its objects. The smart grid is one application of this vision. It
integrates ICT technology into the traditional power grid to cope with the new
requirements that are arising out of its continuing expansion and the incorporation
of new energy sources. Because of interoperability many of these ICT
devices are relying on Web services for transportation of the data generated.
Since most of this data is sensitive, privacy needs to be established. The huge
number of devices that are involved in such a system requires high scalability.
Based on an example scenario arising out of the smart grid, this thesis
introduces an architecture offering authorization as a service. It is based on the
two standards XACML and SAML. It is documented with the 4+1 view model
and a software prototype is implemented. This prototype is then deployed to
the PaaS framework Appscale. Appscale is an open source implementation of
Google's App Engine framework. It enables the execution of applications in a
cloud environment, without the need to take care of the issues arising out of
the distributed computing model. For comparison a version of this architecture
runnable on an on-premises system is developed. Evaluation of the prototype
focuses on its scalability. Load tests are run against the system in various
configurations with all distributed databases offered by Appscale. The
recorded results are ranging from a very unstable behaviour to the awaited
scalability dependent on the number of nodes used for Appscale deployment.
17