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TU Berlin

Inhalt des Dokuments

Compatibility of Anonymity and Performance in Onion Routing Networks

The DFG project „Compatibility of Anonymity and Performance in Onion Routing Networks“ aims to research the extent to which future anonymization networks can fulfill their primary expectations, namely strong anonymity and high performance.

Anonymization networks like Tor denote an increasingly important tool to establish and strengthen privacy on the Internet. In order to ensure a high level of usability, which appears to be necessary for fostering their future usage, it is important to improve the performance that can be achieved by such systems. However, this creates fundamental challenges with regard to achievable anonymity guarantees.

Our project conducts a structured evaluation of the underlying inherent conflict between performance and anonymity. It aims to quantify this conflict in a theoretically sound manner, and to draw practically usable conclusions for the design of modern anonymization techniques. While security and performance in anonymization networks have previously been investigated separately, this research project wants to identify their precise interdependencies. Based on this insight, we develop methods for strengthening both, performance and anonymity, such that a practically usable trade-off can be designed and realized. This holistic approach towards both aspects is especially necessary in the face of increasingly powerful potential adversaries, for ensuring secure and usable anonymization networks in the future. Therefore, this project contributes to retaining and strengthening a free Internet.


Christoph Döpmann
Distributed Security Infrastructures
Technische Universität Berlin
Einsteinufer 17, 10587 Berlin


Christoph Döpmann and Valentin Franck and Florian Tschorsch (2021). Onion Pass: Token-Based Denial-of-Service Protection for Tor Onion Services. NETWORKING '21: IFIP Networking Conference

Link to original publication

Christoph Döpmann and Matthias Marx and Hannes Federrath and Florian Tschorsch (2021). Tor Relays an Universitäten – Erfahrungen und Abwägungen. Datenschutz und Datensicherheit - DuD

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Christoph Döpmann and Felix Fiedler and Sergio Lucia and Florian Tschorsch (2021). Optimization-Based Predictive Congestion Control for the Tor Network: Opportunities and Challenges. ACM Transactions on Internet Technology, Special Issue on Recent Advances in Networks and Distributed Systems

Felix Fiedler and Christoph Döpmann and Florian Tschorsch and Sergio Lucia (2020). PredicTor: Predictive Congestion Control for the Tor Network. CCTA '20: IEEE Conference on Control Technology and Applications

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Christoph Döpmann and Sebastian Rust and Florian Tschorsch (2018). Exploring Deployment Strategies for the Tor Network. LCN '18: Proceedings of the 43rd IEEE International Conference on Local Computer Networks

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Christoph Döpmann and Florian Tschorsch (2018). CircuitStart: A Slow Start For Multi-Hop Anonymity Systems. SIGCOMM '18: Proceedings of the SIGCOMM Posters and Demos

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