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Auflistung nach Autor:in "Labitzke, Sebastian"

1 - 3 von 3
  • Konferenzbeitrag
    FOSP: towards a federated object sharing protocol that unifies operations on social content
    (7. DFN-Forum - Kommunikationstechnologien, 2014) Maurer, Felix; Labitzke, Sebastian
    Years ago, the World Wide Web (WWW) began as a system for publishing interlinked hypertext documents. While the protocols on top of which the WWW is built are almost still the same, the usage, as well as the content have changed significantly. Simple delivery of hypertext documents has been expanded by operations, such as uploading, sharing, and commenting on pieces of content. Online Social Networks (OSNs) and other IT services provide aggregated views on these pieces of content. However, the services are often implemented as vendor specific applications on top of common web technologies, such as HTTP, HTML, JavaScript and CSS. Moreover, users are locked into these applications of dedicated providers, which prevents sharing of content across applications and limits the control users have over their data. Most existing approaches that overcome these issues focus on defining a common HTTP API or prefer solutions based on peer-to-peer networks. In this paper, we start by discussing related work and identifying essential requirements for an appropriate solution. Furthermore, we outline the concept and implementation of a Federated Object Sharing Protocol (FOSP), i.e., a different approach to support today's common operations on social content already on a protocol level. We show that services built on top of this protocol can be federated by default, i.e., users registered with different providers can easily interact with each other. Finally, we provide an evaluation and discussion on the proposed approach.
  • Konferenzbeitrag
    How I and others can link my various social network profiles as a basis to reveal my virtual appearance
    (4. DFN-Forum Kommunikationstechnologien, 2011) Labitzke, Sebastian; Dinger, Jochen; Hartenstein, Hannes
    Today, many Internet users take part in online social networks (OSNs) like Facebook, Xing, LinkedIn, MySpace, studiVZ, and others. However, the motives for participation are multifaceted and stand in contrast to the motivation not to join OSNs because of the potential danger with respect to privacy aspects. This risk is already perceived by some OSN users but still underestimated. The naive handling with personal data inside such networks combined with many possibilities to link several OSN profiles of a single user paves the way for third-parties to gather the comprehensive virtual appearance of a person. Therefore, to turn the tables, such correlations of information might be useful to demonstrate to a user a measure of how linkable his personal data is, given the current exposure of his public data in OSN profiles. In this paper we point out some astonishing simple ways to automatically link data from different OSNs. As we want to and have to act compliant to the German data protection laws, we analyze corresponding requirements and sketch our concept for compliant statistical sampling. We further show preliminary results regarding successful profile correlations based on, even under legal and technical constraints, extracted friends lists.
  • Konferenzbeitrag
    Integrierter Shibboleth Identity Provider auf Basis verteilter Identitätsdaten
    (3. DFN-Forum Kommunikationstechnologien. Beiträge der Fachtagung, 2010) Labitzke, Sebastian; Simon, Michael; Dinger, Jochen
    Typischerweise erlauben Shibboleth-basierte Authentifikationsund Autorisationsinfrastrukturen (AAI), wie die DFN-AAI, nur einen Identity Provider (IdP) für eine teilnehmende Organisation, um den Wartungsaufwand seitens des AAI-Betreibers möglichst gering zu halten. Ferner wahrt dies die Benutzerfreundlichkeit, da so das IdP-Verzeichnis minimal ausfällt, aus dem Nutzer vor der Authentifikation die passende Organisation auswählen müssen. Allerdings liegen in großen Einrichtungen Identi- tätsdaten häufig in verteilten Datenquellen vor und sind nicht über eine zentralisierte Schnittstelle verfügbar. Die Shibboleth IdP-Implementierung ist jedoch in der Anbindung verteilter Datenquellen limitiert. In dieser Arbeit werden mögliche Konzepte zur Integration eines IdP in eine Organisation mit verteilten Identitätsdaten vorgestellt und bewertet. Dabei werden für die Authentifikation bestehende Ansätze untersucht. Bislang nicht erfüllten Anforderungen konnte durch zwei Entwicklungen, einem Shibboleth Login Handler und einem JaaS Dispatcher Module, nachgekommen werden. Darüber hinaus wird gezeigt, wie sich die Shibboleth-Attributlieferung in ein bestehendes Identitätsmanagementsystem integrieren lässt. Die Umsetzbarkeit der vorgestellten Integrationslösungen wird abschließend am Beispiel des Karlsruher Instituts für Technologie verdeutlicht.