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Auflistung nach Autor:in "Schnell, Rainer"

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  • Konferenzbeitrag
    Cryptanalysis of the Record Linkage Protocol used by German Cancer Registries
    (Sicherheit 2024, 2024) Heng, Youzhe; Schnell, Rainer; Armknecht, Frederik
    For linking sensitive or medical data in Germany, the widely accepted protocol of the German cancer registries (GCRs) is often used as a baseline model for privacy-preserving record linkage (PPRL). Despite its popularity, no cryptographic analysis of the GCR protocol has been published so far. Given the recent advances in the cryptanalysis of PPRL methods and the resulting increase in privacy demands of PPRL protocols, an evaluation of the GCR protocol is needed. Using the same assumptions as recent attacks on modern PPRL methods, we show that the current GCR protocol cannot protect against attacks. Using a public available database, up to 90% of the encoded records can be correctly re-identified. Therefore, the GCR protocol should no more be used as a blueprint for future registers.
  • Konferenzbeitrag
    Privacy preserving record linkage with ppjoin
    (Datenbanksysteme für Business, Technologie und Web (BTW 2015), 2015) Sehili, Ziad; Kolb, Lars; Borgs, Christian; Schnell, Rainer; Rahm, Erhard
    Privacy-preserving record linkage (PPRL) becomes increasingly important to match and integrate records with sensitive data. PPRL not only has to preserve the anonymity of the persons or entities involved but should also be highly efficient and scalable to large datasets. We therefore investigate how to adapt PPJoin, one of the fastest approaches for regular record linkage, to PPRL resulting in a new approach called P4Join. The use of bit vectors for PPRL also allows us to devise a parallel execution of P4Join on GPUs. We evaluate the new approaches and compare their efficiency with a PPRL approach based on multibit trees.