Publications by Wouter Lueks | EPFL Graph Search

Not Yet Another Digital ID: Privacy-Preserving Humanitarian Aid Distribution

Justinas Sukaitis, Carmela González Troncoso, Wouter Lueks, Boya Wang

Humanitarian aid-distribution programs help bring physical goods to people in need. Traditional paper-based solutions to support aid distribution do not scale to large populations and are hard to secure. Existing digital solutions solve these issues, at th ...

IEEE COMPUTER SOC2023

Deploying Decentralized, Privacy-Preserving Proximity Tracing

Jean-Pierre Hubaux, Sylvain Chatel, Edouard Bugnion, James Richard Larus, Marcel Salathé, Carmela González Troncoso, Wouter Lueks, Mathias Josef Payer, Apostolos Pyrgelis, Theresa Stadler

2022

Toward a Common Performance and Effectiveness Terminology for Digital Proximity Tracing Applications

Marcel Salathé, Carmela González Troncoso, Wouter Lueks

2021

CrowdNotifier: Decentralized Privacy-Preserving Presence Tracing

Edouard Bugnion, Marcel Salathé, Carmela González Troncoso, Wouter Lueks

There is growing evidence that SARS-CoV-2 can be transmitted beyond close proximity contacts, in particular in closed and crowded environments with insufficient ventilation. To help mitigation efforts, contact tracers need a way to notify those who were pr ...

2021

VOTEAGAIN: A scalable coercion-resistant voting system

Carmela González Troncoso, Wouter Lueks

The strongest threat model for voting systems considers coercion resistance: protection against coercers that force voters to modify their votes, or to abstain. Existing remote voting systems either do not provide this property; require expensive operation ...

USENIX ASSOC2020

Tandem: Securing Keys by Using a Central Server While Preserving Privacy

Carmela González Troncoso, Wouter Lueks

Users' devices, e.g., smartphones or laptops, are typically incapable of securely storing and processing cryptographic keys. We present Tandem, a novel set of protocols for securing cryptographic keys with support from a central server. Tandem uses one-tim ...

2020

Early evidence of effectiveness of digital contact tracing for SARS-CoV-2 in Switzerland

Edouard Bugnion, James Richard Larus, Marcel Salathé, Carmela González Troncoso, Wouter Lueks, Mathias Josef Payer, Theresa Stadler, Daniele Antonioli

In the wake of the pandemic of coronavirus disease 2019 (COVID-19), contact tracing has become a key element of strategies to control the spread of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). Given the rapid and intense spread of SARS-CoV ...

E M H SWISS MEDICAL PUBLISHERS LTD2020

DATASHARENETWORK A Decentralized Privacy-Preserving Search Engine for Investigative Journalists

Bruno Thomas, Laurent Girod, Carmela González Troncoso, Wouter Lueks

Investigative journalists collect large numbers of digital documents during their investigations. These documents can greatly benefit other journalists' work. However, many of these documents contain sensitive information. Hence, possessing such documents ...

USENIX ASSOC2020

Reducing Metadata Leakage from Encrypted Files and Communication with PURBs

Jean-Pierre Hubaux, Ludovic Barman, Kirill Nikitin, Matthew Joshua Underwood, Bryan Alexander Ford, Wouter Lueks

Most encrypted data formats leak metadata via their plaintext headers, such as format version, encryption schemes used, number of recipients who can decrypt the data, and even the recipients’ identities. This leakage can pose security and privacy risks to ...

Sciendo2019

zksk: A Library for Composable Zero-Knowledge Proofs

Bogdan Kulynych, Carmela González Troncoso, Wouter Lueks

Zero-knowledge proofs are an essential building block in many privacy-preserving systems. However, implementing these proofs is tedious and error-prone. In this paper, we present zksk, a well-documented Python library for defining and computing sigma proto ...

Association for Computing Machinery2019

ClaimChain: Improving the Security and Privacy of In-band Key Distribution for Messaging

Bogdan Kulynych, Carmela González Troncoso, Wouter Lueks

The social demand for email end-to-end encryption is barely supported by mainstream service providers. Autocrypt is a new community -driven open specification for e-mail encryption that attempts to respond to this demand. In Autocrypt the encryption keys a ...

ACM2018