2009

• Christoph Sturm, Ela Hunt, Marc H. Scholl, Distributed Privilege Enforcement in PACS, Data and Applications Security XXIII, 23rd Annual IFIP WG 11.3 Working Conference, Montreal, Canada, July 12-15, 2009. Proceedings 2009, Springer. (inproceedings)
  
  We present a new access control mechanism for P2P networks with distributed enforcement, called P2P Access Control System (PACS). PACS enforces powerful access control models like RBAC with administrative delegation inside a P2P network in a pure P2P manner, which is not possible in any of the currently used P2P access control mechanisms. PACS uses client-side enforcement to support the replication of confidential data. To avoid a single point of failure at the time of privilege enforcement, we use threshold cryptography to distribute the enforcement among the participants. Our analysis of the expected number of messages and the computational effort needed in PACS shows that its increased flexibility comes with an acceptable additional overhead.
  

2008

• Christoph Sturm, Klaus R. Dittrich, Patrick Ziegler, An Access Control Mechanism for P2P Collaborations, DaMaP '08: Proceedings of the 2008 international workshop on Data management in peer-to-peer systems 2008, ACM. (inproceedings)
  
  

2006

• Patrick Ziegler, Christoph Kiefer, Christoph Sturm, Klaus R. Dittrich, Abraham Bernstein, Detecting Similarities in Ontologies with the SOQA-SimPack Toolkit, 10th International Conference on Extending Database Technology (EDBT 2006), Editor(s): Yannis Ioannidis, Marc H. Scholl, Joachim W. Schmidt, Florian Matthes, Mike Hatzopoulos, Klemens Boehm, Alfons Kemper, Torsten Grust, Christian Boehm, March ; 2006, Springer. (inproceedings)
  
  Ontologies are increasingly used to represent the intended real-world semantics of data and services in information systems. Unfortunately, different databases often do not relate to the same ontologies when describing their semantics. Consequently, it is desirable to have information about the similarity between ontology concepts for ontology alignment and integration. This paper presents the SOQA-SimPack Toolkit (SST), an ontology language independent Java API that enables generic similarity detection and visualization in ontologies. We demonstrate SST's usefulness with the SOQA-SimPack Toolkit Browser, which allows users to graphically perform similarity calculations in ontologies.
  
• Patrick Ziegler, Christoph Kiefer, Christoph Sturm, Klaus R. Dittrich, Abraham Bernstein, Generic Similarity Detection in Ontologies with the SOQA-SimPack Toolkit, SIGMOD Conference, June 2006, ACM. (inproceedings)
  
  Ontologies are increasingly used to represent the intended real-world semantics of data and services in information systems. Unfortunately, different databases often do not relate to the same ontologies when describing their semantics. Consequently, it is desirable to have information about the similarity between ontology concepts for ontology alignment and integration. In this demo, we present the SOQASimPack Toolkit (SST) [7], an ontology language independent Java API that enables generic similarity detection and visualization in ontologies. We demonstrate SST?s usefulness with the SOQA-SimPack Toolkit Browser, which allows users to graphically perform similarity calculations in ontologies.
  
• Christoph Sturm, Orchestrating Access Control in Peer Data Management Systems, EDBT Ph.D. Workshop, Munich, 2006, Springer. (inproceedings)
  
  
• Patrick Ziegler, Christoph Sturm, Klaus R. Dittrich, The SIRUP Ontology Query API in Action., 10th International Conference on Extending Database Technology (EDBT 2006), Munich 2006. (inproceedings)
  
  

2005

• Patrick Ziegler, Christoph Sturm, Klaus R. Dittrich, Unified Querying of Ontology Languages with the SIRUP Ontology Query API, Datenbanksysteme in Business, Technologie und Web (BTW 2005) 2005. (inproceedings)
  
  

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