Publications (12)
Do I Get the Privacy I Need? Benchmarking Utility in Differential Privacy Libraries
Gonzalo Munilla Garrido, Joseph Near, Aitsam Muhammad +3
An increasing number of open-source libraries promise to bring differential privacy to practice, even for non-experts. This paper studies five libraries that offer differentially p…
How to Securely Prune Bitcoin's Blockchain
Roman Matzutt, Benedikt Kalde, Jan Pennekamp +3
Bitcoin was the first successful decentralized cryptocurrency and remains the most popular of its kind to this day. Despite the benefits of its blockchain, Bitcoin still faces seri…
Poster: Accountable Processing of Reported Street Problems
Roman Matzutt, Jan Pennekamp, Klaus Wehrle
Municipalities increasingly depend on citizens to file digital reports about issues such as potholes or illegal trash dumps to improve their response time. However, the responsible…
Utilizing Public Blockchains for the Sybil-Resistant Bootstrapping of Distributed Anonymity Services
Roman Matzutt, Jan Pennekamp, Erik Buchholz +1
Distributed anonymity services, such as onion routing networks or cryptocurrency tumblers, promise privacy protection without trusted third parties. While the security of these ser…
Complying with Data Handling Requirements in Cloud Storage Systems
Martin Henze, Roman Matzutt, Jens Hiller +4
In past years, cloud storage systems saw an enormous rise in usage. However, despite their popularity and importance as underlying infrastructure for more complex cloud services, t…
Seldom: An Anonymity Network with Selective Deanonymization
Eric Wagner, Roman Matzutt, Martin Henze
While anonymity networks such as Tor provide invaluable privacy guarantees to society, they also enable all kinds of criminal activities. Consequently, many blameless citizens shy…
From Legacy to Standard: LLM-Assisted Transformation of Cybersecurity Playbooks into CACAO Format
Mehdi Akbari Gurabi, Lasse Nitz, Radu-Mihai Castravet +3
Existing cybersecurity playbooks are often written in heterogeneous, non-machine-readable formats, which limits their automation and interoperability across Security Orchestration,…
The SensorCloud Protocol: Securely Outsourcing Sensor Data to the Cloud
Martin Henze, René Hummen, Roman Matzutt +1
The increasing deployment of sensor networks, ranging from home networks to industrial automation, leads to a similarly growing demand for storing and processing the collected sens…
An Interdisciplinary Survey on Information Flows in Supply Chains
Jan Pennekamp, Roman Matzutt, Christopher Klinkmüller +12
Supply chains form the backbone of modern economies and therefore require reliable information flows. In practice, however, supply chains face severe technical challenges, especial…
CoinPrune: Shrinking Bitcoin's Blockchain Retrospectively
Roman Matzutt, Benedikt Kalde, Jan Pennekamp +3
Popular cryptocurrencies continue to face serious scalability issues due to their ever-growing blockchains. Thus, modern blockchain designs began to prune old blocks and rely on re…
Scalable and Privacy-Focused Company-Centric Supply Chain Management
Eric Wagner, Roman Matzutt, Jan Pennekamp +4
Blockchain technology promises to overcome trust and privacy concerns inherent to centralized information sharing. However, current decentralized supply chain management systems do…
Putting Privacy into Perspective -- Comparing Technical, Legal, and Users' View of Data Sensitivity
Eva-Maria Schomakers, Chantal Lidynia, Dirk Müllmann +4
Web 2.0, social media, cloud computing, and IoT easily connect people around the globe, overcoming time and space barriers, and offering manifold benefits. However, the technologic…