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Publications (peer reviewed)

1. Thomas Deselaers, Lexi Pimenidis, Hermann Ney
   Bag-of-Visual-Words Models for Adult Image Classification and Filtering
   19th International Conference on Pattern Recognition, ICPR 2008, Tampa, Florida, USA, December 8-11, 2008.
   

2. Andriy Panchenko, Lexi Pimenidis
   On Application Layer Profiling to Speed-Up Predecessor Attacks in Anonymizing Networks
   15th International Conference on Telecommunications, ICT08, St. Petersburg Russia, June 16th-19th, 2008.
   

3. Dogan Kesdogan, Vinh Pham, Lexi Pimenidis
   Analyse der Verkettbarkeit in nutzergesteuertem Identitätsmanagement
   Sicherheit 2008, Fachbereich Sicherheit der Gesellschaft für Informatik, Saarbrücken, 2008.
   

4. Andriy Panchenko, Lexi Pimenidis, Hannes Renner
   Performance Analysis of Anonymous Communication Channels Provided by Tor
   Proceedings of the Third International Conference on Availability, Reliability and Security, ARES 2008, Barcelona, Spain, March 2008.
   

5. Dogan Kesdogan, Vinh Pham, Lexi Pimenidis
   Information Disclosure in Identity Management
   Proceedings of 12th Nordic Workshop on Secure IT-Systems, Reykjavik, Iceland, 11-12 October 2007.
   

6. Andriy Panchenko, Lexi Pimenidis
   Crowds Revisited: Practically Effective Predecessor Attack
   Proceedings of 12th Nordic Workshop on Secure IT-Systems, Reykjavik, Iceland, 11-12 October 2007.
   

7. Lexi Pimenidis
   On Anonymity Loss in Open Environments
   Proceedings of 12th Nordic Workshop on Secure IT-Systems, Reykjavik, Iceland, 11-12 October 2007.
   

8. Olaf Landsiedel, Lexi Pimenidis, Klaus Wehrle, Heiko Niedermayer, Georg Carle
   More: A Peer-To-Peer Based Connectionless Onion Router
   IEEE GLOBECOM, Globalcommunications Conference, Washington DC, USA, November 26th, 2007.
   

9. David R. Piegdon, Lexi Pimenidis
   Hacking in Physically Addressable Memory
   Fourth GI International Conference on Detection of Intrusions & Malware, and Vulnerability Assessment, Lucerne, Switzerland, July 12th, 2007.
   

10. Andriy Panchenko, Lexi Pimenidis
    Using Trust to Resist Censorship in the Presence of Collusion
    22nd IFIP TC-11 International Information Security Conference, Sandton Convention Centre, Sandton, South Africa, May 2007.
    

11. Lexi Pimenidis
    Degrading Anonymity in Networks Providing Access to External Services
    SSI 2006, 8th International Symposium on System and Information Security, Sao Paulo, Brasil, November 2006.
    

12. Andriy Panchenko, Lexi Pimenidis
    Trust-Based Collusion Resistant Directory Service
    SSI 2006, 8th International Symposium on System and Information Security, Sao Paulo, Brasil, November 2006.
    

13. Andriy Panchenko, Lexi Pimenidis
    Fundamental Limits of Anonymity Provided by Crowds
    SSI 2006, 8th International Symposium on System and Information Security, Sao Paulo, Brasil, November 2006.
    

14. Andriy Panchenko, Lexi Pimenidis
    Towards Practical Attacker Classification for Risk Analysis in Anonymous Communication
    IFIP CMS 2006, Communications and Multimedia Security, Heraklion, Greece, October 2006.
    Download paper

15. Zinaida Benenson, Felix C. Freiling, Ernest Hammerschmidt, Stefan Lucks, Lexi Pimenidis
    Authenticated Query Flooding in Sensor Networks
    IFIP-NetSec'06, Privacy and Anonymity Issues in Networked and Distributed Systems, Karlstad, Sweden, May 2006.
    Download paper

16. Zinaida Benenson, Felix C. Freiling, Ernest Hammerschmidt, Stefan Lucks, Lexi Pimenidis
    Authenticated Query Flooding in Sensor Networks
    Fourth Annual IEEE International Conference on Pervasive Computer and Communications (PerCom), Pisa, Italy, March 2006.
    Download paper

17. Lexi Pimenidis
    A Method for Degradation of Anonymity on Mix Systems for E-Mail and Surfing the WWW
    Sicherheit 2006, 3. Jahrestagung, Fachbereich Sicherheit der Gesellschaft für Informatik, Magdeburg, Februray 2006.
    

18. Sebastian Clauß, Dogan Kesdogan, Tobias Kölsch, Lexi Pimenidis, Stefan Schiffner, Sandra Steinbrecher
    Identitätsmanagement und das Risiko der Re-Identifikation
    Sicherheit 2006, 3. Jahrestagung, Fachbereich Sicherheit der Gesellschaft für Informatik, Magdeburg, Februray 2006.
    

19. Lexi Pimenidis
    Hosting a Hacking Challenge - CTF-style
    Private Investigations, 22nd Chaos Communication Congress, Berlin, December 2005.
    

20. Sebastian Clauß, Dogan Kesdogan, Tobias Kölsch, Lexi Pimenidis, Stefan Schiffner, Sandra Steinbrecher
    Privacy Enhanced Identity Management: Design Considerations and Open Problems
    ACM CCS2005 Workshop on Digital Identity Management, Fairfax, USA. November 2005.
    

21. Lexi Pimenidis and Tobias Kölsch
    Transparent Anonymization of IP Based Network Traffic
    10th Nordic Workshop on Secure IT-systems, October 2005, Tartu, Estonia.
    

22. Dogan Kesdogan, Lexi Pimenidis, Tobias Kölsch
    Intersection Attacks on Web-Mixes: Bringing the Theory into Praxis
    First Workshop on Quality of Protection, Milan, Italy. September 2005.
    

23. Lexi Pimenidis, Dogan Kesdogan
    The Lower Bound of Attacks on Anonymity Systems -- A Unicity Distance Approach
    First Workshop on Quality of Protection, Milan, Italy. September 2005.
    

24. Maximilian Dornseif, Felix Gärtner, Martin Mink, Lexi Pimenidis
    Teaching Data Security at University Degree Level
    The Forth World Conference on Information Security Education, Moscow, May, 2005.
    Download paper

25. Lexi Pimenidis
    A Practical Approach to Transparent and Usable Anonymity Networks
    Sicherheit 2005, 2. Jahrestagung, Fachbereich Sicherheit der Gesellschaft für Informatik, Regensburg, April 2005.
    

26. Dogan Kesdogan and Lexi Pimenidis
    The Hitting Set Attack on Anonymity Protocols
    6th International Workshop on Information Hiding, Toronto, Canada, May 2004
    Download paper

Journals and Magazine Articles

1. Lexi Pimenidis and Eleni Kosta
   The impact of the retention of traffic and location data on the internet user
   Datenschutz und Datensicherheit, Zeitschrift für rechts- und prüfungssicheres Datenmanagement, 2/2008.
   

2. Lexi Pimenidis
   Überwachung von Sicherheit
   MISC - A Magazine on Computer Security. December 2005.
   

Invited Talks

1. Lexi Pimenidis
   Hacking an der Unversität
   GI Fachtagung Sicherheit, 2008, Saarbrücken, Germany, April 2008.
   

2. Lexi Pimenidis
   Hacking als Lehrinhalt
   DECUS Rheinlandtreffen 2007, Forschungszentrum Jülich, Germany, October 2007.
   

3. Lexi Pimenidis
   Targeting Physically Adressable Memory
   SPRING 2, Dortmund, Germany, July 2007.
   

4. Lexi Pimenidis
   Results of Cipher 3
   DIMVA: Detection of Intrusions and Malware & Vulnerability Assessment, Luzern, Swiss, July 2007.
   

5. Lexi Pimenidis
   ``Capture The Flag''
   DIMVA: Detection of Intrusions and Malware & Vulnerability Assessment, Berlin, Germany, July 2006.
   

6. Lexi Pimenidis
   Trendanalyse von Malware mittles anonymer Netzwerke
   BSI-Workshop IT Frühwarnsysteme, Bonn, Germany, July 2006.
   

7. Roger Dingledine, Peter Palfrader, Lexi Pimenidis, Len Sassaman
   Future anonymity networks, a technical discussion
   What The Hack, Liempde, Netherlands, July 2005.