Christoph Ringelstein

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The processing of data is often restricted by contractual and legal requirements for protecting privacy and IPRs. Policies provide means to control how and by whom data is processed. Conditions of policies may depend on the previous processing of the data. However, existing policy languages do not provide means to express such conditions. In this work we(More)
Service-oriented systems facilitate business workflows to span multiple organizations (e.g., by means of Web services). As a side effect, data may be more easily transferred over organizational boundaries. Thus, privacy issues arise. At the same time, there are personal, business and legal requirements for protecting privacy and IPR and allowing customers(More)
Service-oriented systems facilitate business workflows to span multiple organizations (e.g. by means of Web services). As a side effect, data may be more easily transferred over organizational boundaries. Thus, privacy issues arise. At the same time, there are personal, business and legal requirements for protecting privacy and IPR and allowing customers to(More)
Business needs are nowadays frequently realized by business workflows spanning multiple organizations. Current infrastructures, such as SOA, support this trend on the implementation side. As a side effect these issues of privacy and data protection arise, because data is shipped across organizational boundaries. At the same time increased awareness about(More)
Data processing is often restricted by contractual and legal requirements for protecting privacy and intellectual-property rights. Internet policies help control how and by whom data is processed. Policy conditions could depend on previous data processing and thus on the processing histories' temporal structure. However, existing policy languages don't(More)
With novel centralized information management systems, users benefit from collective data organization. Centralization, however, also imposes privacy and availability constraints. With this work we present SEA, a semantic exchange architecture for distributed information management that employs Peer-to-Peer networking, social information management, and(More)
The processing of data is often restricted by contractual and legal requirements for protecting privacy and IPRs. Policies provide means to control how and by whom data is processed. Conditions of policies may depend on the previous processing of the data. However, existing policy languages do not provide means to express such conditions. In this work we(More)
Moderne Infrastrukturlösungen, wie service-orientierte Architekturen, ermöglichen es, Dienstleistungen anzubieten, deren Prozesse über mehrere Organisationen verteilt sind. Als Seiteneffekt treten hierbei neue Problemstellungen für den Datenschutz auf, da personenbezogene Daten über Organisationsgrenzen hinweg übertragen werden. Gleichzeitig fordern Kunden(More)