Sebastian Labitzke

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Due to the amount of personally identifiable information shared by users of online social networks (OSNs) and the often not adequately adjusted privacy settings, it is possible to identify a user’s several OSN profiles. In this paper, we illustrate that third parties just have to take a small step to link OSN profiles of a user and, consequently, to(More)
Federated identity management yields many advantages such as enhanced usability and improved quality of identity information. Web-based services are already successfully and widely federated using the Security Assertion Markup Language (SAML). In terms of usability and quality of identity information non web-based services benefit from being federated in a(More)
A user's online social network (OSN) friends commonly share information on their OSN profiles that might also characterize the user him-/herself. Therefore, OSN friends are potentially jeopardizing users' privacy. Previous studies demonstrated that third parties can potentially infer personally identifiable information (PII) based on information shared by(More)
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(More)
The risk involved when users publish information, which becomes available to an unintentional broad audience via online social networks is evident. It is especially difficult for users of social networks to determine who will get the information before it is shared. Moreover, it is impossible to monitor data flows or to control the access to personal data(More)
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(More)
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(More)
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