Why Open Data May Threaten Your Privacy Sebastian Pape, Jetzabel - - PowerPoint PPT Presentation

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Why Open Data May Threaten Your Privacy Sebastian Pape, Jetzabel - - PowerPoint PPT Presentation

Why Open Data May Threaten Your Privacy Sebastian Pape, Jetzabel Serna-Olvera, Welderufael B. Tesfay Goethe University Frankfurt Chair of Mobile Business and Multilateral Security Workshop on Privacy and Inference September 21st, 2015 Pape,


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Why Open Data May Threaten Your Privacy

Sebastian Pape, Jetzabel Serna-Olvera, Welderufael B. Tesfay

Goethe University Frankfurt Chair of Mobile Business and Multilateral Security

Workshop on Privacy and Inference September 21st, 2015

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Open Data / De-Anonymization Proposed Approach Conclusion Feedback

Overview

1 Open Data / De-Anonymization 2 Proposed Approach 3 Conclusion

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Open Data / De-Anonymization Proposed Approach Conclusion Feedback

Open Data / De-Anonymization Open Data

Broad range of Applications Services helpful to society (e.g. health, educational services) Balancing act between usefulness and anonymization

De-Anonymization

Often works by linking data sets “unexpectedly” Gets easier with more Open Data Machine Learning allows to work with fuzzy data

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Open Data / De-Anonymization Proposed Approach Conclusion Feedback

Tool Support

Not the fault of anonymization algorithms Tool support to identify relevant Open Data needed Several capabilities for machine learning approaches Scope limited to Open Data

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Open Data / De-Anonymization Proposed Approach Conclusion Feedback

Mirroring Privacy-Related Open Data

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Open Data / De-Anonymization Proposed Approach Conclusion Feedback

Referencing Privacy-Related Open Data

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Open Data / De-Anonymization Proposed Approach Conclusion Feedback

Comparison Mirroring

+ Usability + Quality of Prediction + Versioning

  • Updates
  • Storage
  • Bandwidth

Referencing

  • Usability

= Quality of Prediction

  • Versioning

= Updates + Storage = Bandwidth

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Open Data / De-Anonymization Proposed Approach Conclusion Feedback

Proposed Steps Steps

C Collection (O) L Linkage (T) U User Interaction (O/T) A Anonymization as a Service (T) D De-Anonymization-Tests as a Service (T)

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Open Data / De-Anonymization Proposed Approach Conclusion Feedback

Challenges Steps Challenges

C Collection (O) L Linkage (T) U User Interaction (O/T) A Anonymization as a Service (T) D De-Anonymization-Tests as a Service (T) C1 Rate Privacy-Relevance C2 Version Control System L1 Context of Database L2 Field Names

DCAT, VoID

L3 Sparse matches U1 Structure vs. Full Data A1 Server Side vs. Client Side Analysis D1 Deterministic vs. Probabilistic Model

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Open Data / De-Anonymization Proposed Approach Conclusion Feedback

Conclusion / Discussion

Open Data: More attention should be paid to privacy risks Tool support needs to be improved Publication of Open Data should not be prevented

Ohm (2009) vs. O’Hara (2011)

Useful tool or threat?

→ Short-term: threat → Long-term: useful tool

Should the tool regard leaked/stolen data?

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Open Data / De-Anonymization Proposed Approach Conclusion Feedback

Feedback

sebastian.pape jetzabel.serna welderufael.tesfay

@m-chair.de

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