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CryptoTL: Private, efficient and secure transfer learning [article]

Roman Walch, Samuel Sousa, Lukas Helminger, Stefanie Lindstaedt, Christian Rechberger, Andreas Trügler
2022 arXiv   pre-print
Big data has been a pervasive catchphrase in recent years, but dealing with data scarcity has become a crucial question for many real-world deep learning (DL) applications. A popular methodology to efficiently enable the training of DL models to perform tasks in scenarios where only a small dataset is available is transfer learning (TL). TL allows knowledge transfer from a general domain to a specific target one; however, such a knowledge transfer may put privacy at risk when it comes to
more » ... ve or private data. With CryptoTL we introduce a solution to this problem, and show for the first time a cryptographic privacy-preserving TL approach based on homomorphic encryption that is efficient and feasible for real-world use cases. We demonstrate this by focusing on classification tasks with small datasets and show the applicability of our approach for sentiment analysis. Additionally we highlight how our approach can be combined with differential privacy to further increase the security guarantees. Our extensive benchmarks show that using CryptoTL leads to high accuracy while still having practical fine-tuning and classification runtimes despite using homomorphic encryption. Concretely, one forward-pass through the encrypted layers of our setup takes roughly 1s on a notebook CPU.
arXiv:2205.11935v1 fatcat:y5smx3ncnrcark5ht43x33tfci

Privately Connecting Mobility to Infectious Diseases via Applied Cryptography [article]

Alexandros Bampoulidis and Alessandro Bruni and Lukas Helminger and Daniel Kales and Christian Rechberger and Roman Walch
2021 arXiv   pre-print
Human mobility is undisputedly one of the critical factors in infectious disease dynamics. Until a few years ago, researchers had to rely on static data to model human mobility, which was then combined with a transmission model of a particular disease resulting in an epidemiological model. Recent works have consistently been showing that substituting the static mobility data with mobile phone data leads to significantly more accurate models. While prior studies have exclusively relied on a
more » ... e network operator's subscribers' aggregated data, it may be preferable to contemplate aggregated mobility data of infected individuals only. Clearly, naively linking mobile phone data with infected individuals would massively intrude privacy. This research aims to develop a solution that reports the aggregated mobile phone location data of infected individuals while still maintaining compliance with privacy expectations. To achieve privacy, we use homomorphic encryption, zero-knowledge proof techniques, and differential privacy. Our protocol's open-source implementation can process eight million subscribers in one and a half hours. Additionally, we provide a legal analysis of our solution with regards to the EU General Data Protection Regulation.
arXiv:2005.02061v3 fatcat:gxakhag2t5d73bzuum6gwgeqii

Damnation et salut babélique dans le théâtre luxembourgeois

Ian De Toffoli
2015 unpublished
) 11 Voir par exemple ce que dit le personnage de Lukas Pieß dans In der Tränenschule de Guy Rewenig : « Wir sind eine Festung!  ...  (Helminger, 2007 : 44) .  ... 

Untersuchungen zur genealogischen Skaldendichtung [article]

Debora Dusse, Humboldt-Universität Zu Berlin, Humboldt-Universität Zu Berlin
Das Grundprinzip, dem die Dichtung folgt, ist das der Variation, wobei die einzelnen Helminge die Darstellung der Todesart der Fürsten variieren.  ...  Die entsprechenden Abschnitte der Bibel in Genesis, Matthäus 1,1-17 und Lukas 3,23-38, aber, aus dem Bereich der antiken Tradition, auch die Aeneis des Vergil hatten großen Einfluss auf die Ausgestaltung  ... 
doi:10.18452/16758 fatcat:bph7onepcndrtbi5yymdckylg4

Mythological Names and dróttkvætt Formulae I: When is a Valkyrie Like a Spear?

2014 Studia Metrica et Poetica  
La oss likevel gå med på at en kristen tradisjonsbaerer overførte litt av Lukas i slutten av kvadet.  ...  meninu" (1941: 39). 301 Edith Marold sier om galgekjenningen i sin funksjonsanalyse avYt: "Hier wird die Kenning sogar noch auf das Verb ausgedehnt, so da sie als Höhepunkt ganz den letzten der drei Helminge  ... 
doi:10.12697/smp.2013.1.1.06 fatcat:ncrgjanez5agpn263qes5dnpzu

Die Entwicklung der Wiener Gemeindebauten im Kontext ihrer Architektur

Natalie Baumann
2012 unpublished
Von zahlreichen Architekten (Peter Czernin, Harry Glück, Matthias Lukas Lang, Karl Leber, Johannes Lintl, Heinrich Matha, Peter Payer und Oskar Payer) geplant, fanden die Bauarbeiten in mehreren Bauphasen  ...  beispielsweise die Steinskulptur "Der Liegende" von Alfred Kurz, das Natursteinrelief "Märchenfiguren aus 1001 Nacht" von Eduard Robitschko oder die Kalksteinplastik "Pression Repression" von Wolfgang Helminger  ... 
doi:10.25365/thesis.19275 fatcat:l7jyg5jl6bgv7dmizccvk3rm7i