Stefan Köpsell

94 papers A* 1A 5B 2C 3Journal 39Unranked 40

Year	Rank	Type	Title / Venue / Authors
2026	J	`jnl`	Frequency Hopping Waveform Design for Secure Integrated Sensing and Communications. IEEE Trans. Inf. Forensics Secur. Ali Khandan Boroujeni, Giuseppe Thadeu Freitas de Abreu, Stefan Köpsell, Ghazal Bagheri, Kuranage Roche Rayan Ranasinghe, Rafael F. Schaefer
2026	J	`jnl`	Security, Privacy and System-Level Resillience of 6G End-to-End System: Hexa-X-II Perspective. CoRR Pawani Porambage, Diego Lopez, Antonio Pastor, Bin Han, José María Jorquera Valero, Manuel Gil Pérez, Noelia Pérez Palma, Antonio F. Skarmeta, Prajnamaya Dass, Stefan Köpsell, Sonika Ujjwal, Javier Jose Diaz Rivera, Pol Alemany, Raul Muñoz, Jafar Mohammadi, Chaitanya Aggarwal, Betül Güvenç Paltun, Ferhat Karakoç
2026	J	`jnl`	mopri - An Analysis Framework for Unveiling Privacy Violations in Mobile Apps. CoRR Cornell Ziepel, Stephan Escher, Sebastian Rehms, Stefan Köpsell
2026	J	`jnl`	zkRNN: Zero-Knowledge Proofs for Recurrent Neural Network Inference. IACR Cryptol. ePrint Arch. Fatemeh Zarinjouei, Behzad Abdolmaleki, Maryam Zarezadeh, Bhavish Mohee, Aysajan Abidin, Stefan Köpsell
2025	—	`conf`	5G-Pentest-UE: A Penetration Testing Framework for Identifying 5G System Vulnerabilities. ARES (EU Projects Symposium Workshops 2) Richard Riedel, Stefan Köpsell
2025	A	`conf`	A Cloudy View on Trust Relationships of CVMs: How Confidential Virtual Machines are Falling Short in Public Cloud. ACSAC Jana Eisoldt, Anna Galanou, Andrey Ruzhanskiy, Nils Küchenmeister, Yewgenij Baburkin, Tianxiang Dai, Ivan Gudymenko, Stefan Köpsell, Rüdiger Kapitza
2025	—	`conf`	A New Privacy Modeling and Enhancement Methodology for JCAS-Enabled Railway Applications. AINA (5) Yevhen Zolotavkin, Prajnamaya Dass, Stefan Köpsell
2025	J	`jnl`	AlphaFL: Secure Aggregation with Malicious IACR Cryptol. ePrint Arch. Yufan Jiang, Maryam Zarezadeh, Tianxiang Dai, Stefan Köpsell
2025	J	`jnl`	AlphaFL: Secure Aggregation with Malicious2 Security for Federated Learning against Dishonest Majority. Proc. Priv. Enhancing Technol. Yufan Jiang, Maryam Zarezadeh, Tianxiang Dai, Stefan Köpsell
2025	J	`jnl`	Conceptualizing Trustworthiness and Trust in Communications. IEEE Commun. Mag. Gerhard P. Fettweis, Patricia Grünberg, Tim Hentschel, Stefan Köpsell
2025	J	`jnl`	Cross-Layer Integrated Sensing and Communication: A Joint Industrial and Academic Perspective. IEEE Open J. Commun. Soc. Henk Wymeersch, Nuutti Tervo, Stefan Wänstedt, Sharief Saleh, Joerg Ahlendorf, Özgür Umut Akgül, Vasileios Tsekenis, Sokratis Barmpounakis, Liping Bai, Martin Beale, Rafael Berkvens, Nabeel Nisar Bhat, Hui Chen, Shrayan Das, Claude Desset, Antonio de la Oliva, Prajnamaya Dass, Jeroen Famaey, Hamed Farhadi, Gerhard P. Fettweis, Yu Ge, Hao Guo, Rreze Halili, Katsuyuki Haneda, Abdur Rahman Mohamed Ismail, Akshay Jain, Sylvaine Kerboeuf, Musa Furkan Keskin, Emad Ibrahim, Bilal Khan, Siddhartha Kumar, Stefan Köpsell, Apostolos Kousaridas, Pekka Kyösti, Simon Lindberg, Mohammad Hossein Moghaddam, Ahmad Nimr, Victor Pettersson, Aarno Pärssinen, Basuki Priyanto, Athanasios Stavridis, Tommy Svensson, Sonika Ujjwal
2025	J	`jnl`	Cross-layer Integrated Sensing and Communication: A Joint Industrial and Academic Perspective. CoRR Henk Wymeersch, Nuutti Tervo, Stefan Wänstedt, Sharief Saleh, Joerg Ahlendorf, Özgür Umut Akgül, Vasileios Tsekenis, Sokratis Barmpounakis, Liping Bai, Martin Beale, Rafael Berkvens, Nabeel Nisar Bhat, Hui Chen, Shrayan Das, Claude Desset, Antonio de la Oliva, Prajnamaya Dass, Jeroen Famaey, Hamed Farhadi, Gerhard P. Fettweis, Yu Ge, Hao Guo, Rreze Halili, Katsuyuki Haneda, Abdur Rahman Mohamed Ismail, Akshay Jain, Sylvaine Kerboeuf, Musa Furkan Keskin, Emad Ibrahim, Bilal Khan, Siddhartha Kumar, Stefan Köpsell, Apostolos Kousaridas, Pekka Kyösti, Simon Lindberg, Mohammad Hossein Moghaddam, Ahmad Nimr, Victor Pettersson, Aarno Pärssinen, Basuki Priyanto, Athanasios Stavridis, Tommy Svensson, Sonika Ujjwal
2025	J	`jnl`	Feature extraction for channel reciprocity based secret key generation methods. J. Commun. Networks Ghazal Bagheri, Paul Walther, Max Braunig, Ali Khandan Boroujeni, Stefan Köpsell
2025	—	`conf`	Formally-Verified Security Against Forgery of Remote Attestation Using SSProve. ESORICS (2) Sara Zain, Jannik Mähn, Stefan Köpsell, Sebastian Ertel
2025	J	`jnl`	Formally-verified Security against Forgery of Remote Attestation using SSProve. CoRR Sara Zain, Jannik Mähn, Stefan Köpsell, Sebastian Ertel
2025	J	`jnl`	Frequency Hopping Waveform Design for Secure Integrated Sensing and Communications. CoRR Ali Khandan Boroujeni, Giuseppe Thadeu Freitas de Abreu, Stefan Köpsell, Ghazal Bagheri, Kuranage Roche Rayan Ranasinghe, Rafael F. Schaefer
2025	—	`conf`	Information Inference Diagrams: Complementing Privacy and Security Analyses Beyond Data Flows. APF Sebastian Rehms, Stefan Köpsell, Verena Klös, Florian Tschorsch
2025	—	`conf`	LCM-RA: Secure and Attestation-Enabled Publish/Subscribe for Dynamic Groups. VTC2025-Fall Moritz Jasper, Stefan Köpsell
2025	J	`jnl`	Optimal obfuscation of awareness messages: Improving users' unlinkability in Intelligent Transport Systems. Comput. Networks Yevhen Zolotavkin, Yurii Baryshev, Jannik Mähn, Vitalii Lukichov, Stefan Köpsell
2025	A	`conf`	POTENTIAL: Privacy-Oriented Task Offloading via Context-Aware Risk Estimation in JCAS-Enabled Edge Networks. MSWiM Mahshid Mehrabi, Vincent Latzko, Stefan Köpsell
2025	J	`jnl`	Post-Quantum Access Control with Application to Secure Data Retrieval. IACR Commun. Cryptol. Behzad Abdolmaleki, Hannes Blümel, Tianxiang Dai, Giacomo Fenzi, Homa Khajeh, Stefan Köpsell, Maryam Zarezadeh
2025	J	`jnl`	Priv-PFL: A Privacy-Preserving and Efficient Personalized Federated Learning Approach. IACR Cryptol. ePrint Arch. Alireza Aghabagherloo, Roozbeh Sarenche, Maryam Zarezadeh, Bart Preneel, Stefan Köpsell
2025	B	`conf`	Privacy Analysis and Enhancement for Joint Communication and Sensing Applications. IWCMC Yevhen Zolotavkin, Prajnamaya Dass, Stefan Köpsell
2025	B	`conf`	Privacy Preserving Integrated Sensing and Communication Architecture for 6G Networks. Networking Prajnamaya Dass, Yevhen Zolotavkin, Stefan Köpsell
2025	J	`jnl`	Privacy-Preserving Identifier Checking in 5G. CoRR Marcel Gräfenstein, Stefan Köpsell, Maryam Zarezadeh
2025	J	`jnl`	Privacy-Preserving Identifier Checking in 5G. IACR Cryptol. ePrint Arch. Marcel Gräfenstein, Stefan Köpsell, Maryam Zarezadeh
2025	—	`conf`	RF Hardware Reconfigurability for Privacy-Preserving Integrated Sensing and Communication. JC&S Padmanava Sen, Prajnamaya Dass, Stefan Köpsell, Gerhard P. Fettweis
2025	—	`conf`	Security, Privacy, and Resilience Controls for the 6G End-to-End System Developed in Hexa-X-II. EuCNC/6G Summit Pawani Porambage, Noelia Pérez Palma, Diego Lopez, Antonio Pastor, Bin Han, Betül Güvenç Paltun, Ferhat Karakoç, Prajnamaya Dass, Stefan Köpsell, Sonika Ujjwal, Philipp Schulz, Anton Schösser, Pol Alemany, Raul Muñoz, Ricard Vilalta, José María Jorquera Valero, Manuel Gil Pérez, Antonio F. Skarmeta, Dinaj Attanayake, Amitha Mayya, Ali Khandan Boroujeni, Hans D. Schotten, Sylvaine Kerboeuf, Gerhard P. Fettweis, Mikko A. Uusitalo
2025	J	`jnl`	SoK: A cloudy view on trust relationships of CVMs - How Confidential Virtual Machines are falling short in Public Cloud. CoRR Jana Eisoldt, Anna Galanou, Andrey Ruzhanskiy, Nils Küchenmeister, Yewgenij Baburkin, Tianxiang Dai, Ivan Gudymenko, Stefan Köpsell, Rüdiger Kapitza
2024	J	`jnl`	A Model-oriented Reasoning Framework for Privacy Analysis of Complex Systems. CoRR Sebastian Rehms, Stefan Köpsell, Verena Klös, Florian Tschorsch
2024	—	`conf`	Addressing Privacy Concerns in Joint Communication and Sensing for 6G Networks: Challenges and Prospects. APF Prajnamaya Dass, Sonika Ujjwal, Jiri Novotny, Yevhen Zolotavkin, Zakaria Laaroussi, Stefan Köpsell
2024	J	`jnl`	Addressing Privacy Concerns in Joint Communication and Sensing for 6G Networks: Challenges and Prospects. CoRR Prajnamaya Dass, Sonika Ujjwal, Jiri Novotny, Yevhen Zolotavkin, Zakaria Laaroussi, Stefan Köpsell
2024	J	`jnl`	Conceptualizing Trustworthiness and Trust in Communications. CoRR Gerhard P. Fettweis, Patricia Grünberg, Tim Hentschel, Stefan Köpsell
2024	—	`conf`	Enabling Mobility-Oriented JCAS in 6G Networks: An Architecture Proposal. JC&S Philipp Rosemann, Sanket Partani, Marc Miranda, Jannik Mähn, Michael Karrenbauer, William Meli, Rodrigo Hernangómez, Maximilian Lübke, Jacob Kochems, Stefan Köpsell, Anosch Aziz-Koch, Ramez Askar, Julia Beuster, Oliver Blume, Norman Franchi, Reiner S. Thomä, Slawomir Stanczak, Hans D. Schotten
2024	—	`conf`	Enhancing Frequency Hopping Security in ISAC Systems: A Physical Layer Security Approach. JC&S Ali Khandan Boroujeni, Ghazal Bagheri, Stefan Köpsell
2024	J	`jnl`	Exploring Privacy Issues in Mission Critical Communication: Navigating 5G and Beyond Networks. CoRR Prajnamaya Dass, Marcel Gräfenstein, Stefan Köpsell
2024	—	`conf`	Gaining Back the Control Over Identity Attributes: Access Management Systems Based on Self-Sovereign Identity. Open Identity Summit Kenneth-Raphael Keil, Ricardo Bochnia, Ivan Gudymenko, Stefan Köpsell, Jürgen Anke
2024	—	`conf`	Machine Learning-Based Vector Quantization for Secret Key Generation in Physical Layer Security. GIIS Ghazal Bagheri, Ali Khandan Boroujeni, Stefan Köpsell
2024	—	`conf`	Navigating Privacy Challenges in Mission Critical Communication: Insights for 6G Networks. CAMAD Prajnamaya Dass, Marcel Gräfenstein, Stefan Köpsell
2024	J	`jnl`	Post-Quantum Access Control with Application to Secure Data Retrieval. IACR Cryptol. ePrint Arch. Behzad Abdolmaleki, Hannes Blümel, Giacomo Fenzi, Homa Khajeh, Stefan Köpsell, Maryam Zarezadeh
2023	J	`jnl`	Enabling Mobility-Oriented JCAS in 6G Networks: An Architecture Proposal. CoRR Philipp Rosemann, Sanket Partani, Marc Miranda, Jannik Mähn, Michael Karrenbauer, William Meli, Rodrigo Hernangómez, Maximilian Lübke, Jacob Kochems, Stefan Köpsell, Anosch Aziz-Koch, Julia Beuster, Oliver Blume, Norman Franchi, Reiner S. Thomä, Slawomir Stanczak, Hans D. Schotten
2023	C	`conf`	Improving Unlinkability in C-ITS: A Methodology For Optimal Obfuscation. ICISSP Yevhen Zolotavkin, Yurii Baryshev, Vitalii Lukichov, Jannik Mähn, Stefan Köpsell
2023	J	`jnl`	Improving unlinkability in C-ITS: a methodology for optimal obfuscation. CoRR Yevhen Zolotavkin, Yurii Baryshev, Vitalii Lukichov, Jannik Mähn, Stefan Köpsell
2023	—	`conf`	Secure and Dynamic Publish/Subscribe: LCMsec. VTC Fall Moritz Jasper, Stefan Köpsell
2023	J	`jnl`	Secure and Dynamic Publish/Subscribe: LCMsec. CoRR Moritz Jasper, Stefan Köpsell
2022	J	`jnl`	A Case for Practical Configuration Management Using Hardware-based Security Tokens. CoRR Tim Lackorzynski, Max Ostermann, Stefan Köpsell, Hermann Härtig
2022	J	`jnl`	Context-Aware Security for 6G Wireless: The Role of Physical Layer Security. IEEE Commun. Stand. Mag. Arsenia Chorti, André Noll Barreto, Stefan Köpsell, Marco Zoli, Marwa Chafii, Philippe Sehier, Gerhard P. Fettweis, H. Vincent Poor
2022	J	`jnl`	Secure and Efficient Tunneling of MACsec for Modern Industrial Use Cases. CoRR Tim Lackorzynski, Sebastian Rehms, Tao Li, Stefan Köpsell, Hermann Härtig
2022	—	`conf`	Transparency for Bystanders in IoT regarding audiovisual Recordings. PerCom Workshops Stephan Escher, Katrin Etzrodt, Benjamin Weller, Stefan Köpsell, Thorsten Strufe
2022	—	`conf`	Trustworthy Computing for O-RAN: Security in a Latency-Sensitive Environment. GLOBECOM (Workshops) Sebastian Haas, Mattis Hasler, Friedrich Pauls, Stefan Köpsell, Nils Asmussen, Michael Roitzsch, Gerhard P. Fettweis
2021	J	`jnl`	Context-Aware Security for 6G Wireless The Role of Physical Layer Security. CoRR Arsenia Chorti, André Noll Barreto, Stefan Köpsell, Marco Zoli, Marwa Chafii, Philippe Sehier, Gerhard P. Fettweis, H. Vincent Poor
2021	J	`jnl`	Enabling and Optimizing MACsec for Industrial Environments. IEEE Trans. Ind. Informatics Tim Lackorzynski, Gregor Garten, Jan Sönke Huster, Stefan Köpsell, Hermann Härtig
2021	—	`conf`	How well can your car be tracked: Analysis of the European C-ITS pseudonym scheme. VTC Spring Stephan Escher, Markus Sontowski, Knut Berling, Stefan Köpsell, Thorsten Strufe
2021	J	`jnl`	Towards Intelligent Context-Aware 6G Security. CoRR André Noll Barreto, Stefan Köpsell, Arsenia Chorti, Bertram Poettering, Jens Jelitto, Julia Hesse, Jonathan Boole, Konrad Rieck, Marios Kountouris, Dave Singelée, Kumar Ashwinee
2020	C	`conf`	Enabling and Optimizing MACsec for Industrial Environments (Extended Abstract). WFCS Tim Lackorzynski, Gregor Garten, Jan Sönke Huster, Stefan Köpsell, Hermann Härtig
2020	J	`jnl`	Physical-Layer-Security Box: a concept for time-frequency channel-reciprocity key generation. EURASIP J. Wirel. Commun. Netw. Marco Zoli, André Noll Barreto, Stefan Köpsell, Padmanava Sen, Gerhard P. Fettweis
2020	—	`conf`	Switchbox - Low-latency Fail-safe Assurance of Availability in Industrial Environments. ICIT Tim Lackorzynski, Philipp Rietzsch, Stefan Köpsell
2020	—	`conf`	Towards Transparency in the Internet of Things. APF Stephan Escher, Benjamin Weller, Stefan Köpsell, Thorsten Strufe
2020	—	`conf`	Transparent Microsegmentation in Smart Home IoT Networks. HotEdge Amr Osman, Armin Wasicek, Stefan Köpsell, Thorsten Strufe
2019	C	`conf`	A Comparative Study on Virtual Private Networks for Future Industrial Communication Systems. WFCS Tim Lackorzynski, Stefan Köpsell, Thorsten Strufe
2019	—	`conf`	Attribute-Based Credentials in High-Density Platooning. CSCS Christian Zimmermann, Markus Sontowski, Stefan Köpsell
2019	J	`jnl`	Secure end-to-end processing of smart metering data. J. Cloud Comput. Andrey Brito, Christof Fetzer, Stefan Köpsell, Peter R. Pietzuch, Marcelo Pasin, Pascal Felber, Keiko Verônica Ono Fonseca, Marcelo de Oliveira Rosa, Luiz Celso Gomes Jr., Rodrigo Jardim Riella, Charles B. Prado, Luiz Fernando Rust da Costa Carmo, Daniel E. Lucani, Márton Ákos Sipos, László Nagy, Marcell Fehér
2019	—	`conf`	Towards Secure Communication for High-Density Longitudinal Platooning. VTC Fall Markus Sontowski, Stefan Köpsell, Thorsten Strufe, Christian Zimmermann, Andreas Weinand, Hans D. Schotten, Norbert Bissmeyer
2018	—	`conf`	Chains and Whips - An approach to lighweight MACs. Krypto-Tag Paul Walther, Stefan Köpsell, Frederik Armknecht, Gene Tsudik, Thorsten Strufe
2018	—	`conf`	Cloud Challenge: Secure End-to-End Processing of Smart Metering Data. UCC Companion Andrey Brito, Christof Fetzer, Stefan Köpsell, Marcelo Pasin, Pascal Felber, Keiko Ono Fonseca, Marcelo de Oliveira Rosa, Luiz Celso Gomes Jr., Rodrigo Jardim Riella, Charles B. Prado, Luiz F. R. da Costa Carmo, Daniel E. Lucani, Márton Sipos, László Nagy, Marcell Fehér
2018	J	`jnl`	SecureCloud: Secure Big Data Processing in Untrusted Clouds. CoRR Florian Kelbert, Franz Gregor, Rafael Pires, Stefan Köpsell, Marcelo Pasin, Aurélien Havet, Valerio Schiavoni, Pascal Felber, Christof Fetzer, Peter R. Pietzuch
2018	—	`conf`	Transparent Low-Latency Network Anonymisation for Mobile Devices. SecureComm (1) Martin Byrenheid, Stefan Köpsell, Alexander Naumenko, Thorsten Strufe
2017	—	`conf`	Analysis of Mozambican websites: How do they protect their users? ISSA Ambrosio Patricio Vumo, Josef Spillner, Stefan Köpsell
2017	J	`jnl`	Integrating Privacy-Enhancing Technologies into the Internet Infrastructure. CoRR David Harborth, Dominik Herrmann, Stefan Köpsell, Sebastian Pape, Christian Roth, Hannes Federrath, Dogan Kesdogan, Kai Rannenberg
2017	A	`conf`	SecureCloud: Secure big data processing in untrusted clouds. DATE Florian Kelbert, Franz Gregor, Rafael Pires, Stefan Köpsell, Marcelo Pasin, Aurelien Havet, Valerio Schiavoni, Pascal Felber, Christof Fetzer, Peter R. Pietzuch
2014	—	`conf`	A simple and secure e-ticketing system for intelligent public transportation based on NFC. Urb-IoT Ivan Gudymenko, Felipe Sousa, Stefan Köpsell
2013	—	`conf`	IPv6 Address Obfuscation by Intermediate Middlebox in Coordination with Connected Devices. EUNICE Florent Fourcot, Laurent Toutain, Stefan Köpsell, Frédéric Cuppens, Nora Cuppens-Boulahia
2011	—	`ch.`	Anonymous Web Browsing and Publishing. Encyclopedia of Cryptography and Security (2nd Ed.) Stefan Köpsell
2011	—	`ch.`	Identity and Privacy Issues Throughout Life. Privacy and Identity Management for Life Jaromir Dobias, Marit Hansen, Stefan Köpsell, Maren Raguse, Arnold Roosendaal, Andreas Pfitzmann, Sandra Steinbrecher, Katalin Storf, Harald Zwingelberg
2011	—	`ch.`	Open Source Contributions. Privacy and Identity Management for Life Jan Camenisch, Benjamin Kellermann, Stefan Köpsell, Stefano Paraboschi, Franz-Stefan Preiss, Stefanie Pötzsch, Dave Raggett, Pierangela Samarati, Karel Wouters
2010	—	`—`	Entwicklung und Betrieb eines Anonymisierungsdienstes für das WWW. Stefan Köpsell
2010	A*	`conf`	Trained to accept?: a field experiment on consent dialogs. CHI Rainer Böhme, Stefan Köpsell
2009	J	`jnl`	Risiken der Vorratsspeicherung - Grenzen der Nutzungsüberwachung. Datenschutz und Datensicherheit Andreas Pfitzmann, Stefan Köpsell
2009	—	`conf`	Secure Logging of Retained Data for an Anonymity Service. PrimeLife Stefan Köpsell, Petr Svenda
2008	—	`conf`	Data Retention and Anonymity Services - Introducing a New Class of Realistic Adversary Models. FIDIS Stefan Berthold, Rainer Böhme, Stefan Köpsell
2007	J	`jnl`	Masterstudiengang Datenschutz und Datensicherheit in Russland - Zu einer international harmonisierten Datenschutzausbildung. Datenschutz und Datensicherheit René Balzer, Horst Lazarek, Stefan Köpsell
2006	—	`conf`	Low Latency Anonymous Communication - How Long Are Users Willing to Wait?. ETRICS Stefan Köpsell
2006	—	`conf`	Revocable Anonymity. ETRICS Stefan Köpsell, Rolf Wendolsky, Hannes Federrath
2006	—	`conf`	Vergleich der Verfahren zur Verhinderung von Replay-Angriffen der Anonymisierungsdienste AN.ON und Tor. Sicherheit Stefan Köpsell
2004	—	`conf`	How to achieve blocking resistance for existing systems enabling anonymous web surfing. WPES Stefan Köpsell, Ulf Hillig
2004	A	`conf`	On the PET Workshop Panel "Mix Cascades Versus Peer-to-Peer: Is One Concept Superior?". Privacy Enhancing Technologies Rainer Böhme, George Danezis, Claudia Díaz, Stefan Köpsell, Andreas Pfitzmann
2003	—	`conf`	Anonym im Netz - eine neue Gefahr? DFN-Arbeitstagung über Kommunikationsnetze Stefan Köpsell
2003	—	`conf`	Bezahlsystem für einen Mixkaskaden-basierten Anonymisierungsdienst. GI Jahrestagung (Schwerpunkt "Sicherheit - Schutz und Zuverlässigkeit") Stefan Köpsell, Andreas Müller
2003	J	`jnl`	Erfahrungen mit dem Betrieb eines Anonymisierungsdienstes. Datenschutz und Datensicherheit Stefan Köpsell, Hannes Federrath, Marit Hansen
2003	A	`conf`	Modelling Unlinkability. Privacy Enhancing Technologies Sandra Steinbrecher, Stefan Köpsell
2003	—	`conf`	Wie viel Anonymität verträgt unsere Gesellschaft? DFN-Arbeitstagung über Kommunikationsnetze Stefan Köpsell, Andreas Pfitzmann
2002	—	`conf`	Anonyme und unbeobachtbare Kommunikation im Internet. GI Jahrestagung Hannes Federrath, Stefan Köpsell, Heinrich Langos
2001	—	`conf`	Efficiency Improvements of the Private Message Service. Information Hiding Oliver Berthold, Sebastian Clauß, Stefan Köpsell, Andreas Pfitzmann
2000	—	`conf`	Web MIXes: A System for Anonymous and Unobservable Internet Access. Workshop on Design Issues in Anonymity and Unobservability Oliver Berthold, Hannes Federrath, Stefan Köpsell