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Prof. Dr.-Ing. Günter Schäfer

Phone +49 3677 69 4576

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Kabirov, Airat D.; Anikin, Igor V.; Schatz, David; Schäfer Günter: Scalable and Anonymity Preserving Overlays for Voice over IP Communications, 2018 IEEE International Conference on Dynamics of Systems, Mechanisms and Machines (Dynamics 2018). Omsk, Russland. November 2018. Accepted and in press.

Grey, Michael; Theil, Markus, Roßberg, Michael; Schäfer, Günter: Towards Voronoi-Based Backup Routing for Large-Scale Distributed Applications. 2018 IEEE Global Information Infrastructure and Networking Symposium (GIIS 2018). Thessaloniki, Griechenland, Oktober 2018.

Backhaus, Martin; Theil, Markus; Roßberg Michael; Schäfer, Günter; Sukiennik, David:  A Comprehensive Framework to Evaluate Wireless Networks in Simulation and Real Systems. 2018 IEEE/ACM International Symposium on Distributed Simulation and Real Time Applications (DS-RT). Madrid, Spanien. Oktober 2018.

Backhaus, Martin; Theil, Markus; Roßberg Michael; Schäfer, Günter: Towards a Flexible User-Space Architecture for High-Performance IEEE 802.11 Processing. 2018 IEEE International Conference on Wireless and Mobile Computing, Networking and Communications (WiMob). Limassol, Zypern. Oktober 2018.


Kehr, Sebastian; Quiñones, Eduardo; Langen, Dominik; Böddeker, Bert; Schäfer, Günter :  Parcus: Energy-aware and Robust Parallelization of AUTOSAR Legacy Applications. Accepted at 2017 IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS). Pittsburgh, PA, USA. April 2017.

Martin Byrenheid, Michael Rossberg, Guenter Schaefer, Robert Dorn: Covert-channel-resistant congestion control for traffic normalization in uncontrolled networks, IEEE International Conference on Communications (ICC), May 2017.

Michael Rossberg, Franz Girlich, Guenter Schaefer, David Ristow: Effiziente Überwachung komplexer mehrschichtiger Netzinfrastrukturen, 15. Deutscher IT-Sicherheitskongress, May 2017.

Michael Rossberg, Markus Theil: Secure Enrollment of Certificates Using Short PINs, Proceedings of the 12th International Conference on Availability, Reliability and Security, September 2017.

Schatz, David; Rossberg, Michael; Schaefer, Guenter: Reducing Call Blocking Rates For Anonymous Voice Over IP Communications, IEEE ICUMT, 2017.

Backhaus, Martin; Guenter Schaefer: Towards Construction of Efficient and Optimally Resilient VPN Topologies by Exactly Calculating Maximum Disjoint Paths, IEEE ICC, 2017.

Backhaus, Martin; Guenter Schaefer: Towards Optimally Resilient Topologies against Optimal Attacks, IEEE/IFIP IM - DISSECT, 2017. Best Paper Award.

Backhaus, Martin; Guenter Schaefer: Worst-Case Attacker Models for Two-Layered Networks Based on the Minimum Overlay Cut, IEEE ISCC, 2017.


Kehr, Sebastian; Panic, Milos; Quiñones, Eduardo; Böddeker, Bert; Becerril Sandoval, Jorge; Abella, Jaume; Cazorla, Francisco; Schäfer, Günter: Supertask: Maximizing Runnable-level Parallelism in AUTOSAR Applications. Accepted for publication at EDAA/ACM/IEEE Design Automation and Test in Europe (DATE) 16, Desden, Germany, March 2016.

Markus Trapp, Michael Rossberg, Guenter Schaefer: Automatic source code decomposition for privilege separation. 24th International Conference on Software, Telecommunications and Computer Networks, SoftCOM 2016, Split, Croatia, September 22-24, 2016. IEEE 2016

Backhaus, Martin; Guenter Schaefer: Backup Paths for Multiple Demands in Overlay Networks, IEEE GIIS, 2016.


Kehr, Sebastian; Quiñones, Eduardo; Böddeker, Bert; Schäfer, Günter: Parallel Execution of AUTOSAR Legacy Applications on Multicore ECUs with Timed Implicit Communication. 52nd ACM/EDAC/IEEE Design Automation Conference (DAC), San Francisco, USA, June 2015.

Rothenberger, Ralf; Grau, Sascha; Rossberg, Michael; Dominating an s-t-Cut in a Network, SOFSEM 2015, pp. 401-411, Czech Republic, Springer, 2015


Fischer, Mathias; Grau, Sascha; Nguyen, Giang and Schäfer, Günter; Resilient and Underlay-Aware P2P Live-Streaming, Computer Networks, Volume 59, pp. 122-136, Elsevier, 2014

Grey, Michael; Schatz, David; Rossberg, Michael; Schaefer, Guenter: Towards Distributed Geolocation by Employing a Delay-Based Optimization Scheme, IEEE ISCC, 2014.


Wozniak, Sander; Rossberg, Michael; Grau, Sascha; Alshawish, Ali; Schäfer, Günter: Beyond the Ideal Object: Towards Disclosure-Resilient Order-Preserving Encryption Schemes, CCSW 2013, Berlin, ACM, 2013

Grey, Michael; Trapp, Markus; Rossberg, Michael; Schaefer, Guenter; Martius, Kai: Skalierbare Lastbalancierung autokonfigurierter VPN. Accepted for: 13. Deutscher IT-Sicherheitskongress, 2013.

Wozniak, Sander; Rossberg, Michael; Schaefer, Guenter: Towards Trustworthy Mobile Social Networking Services for Disaster Response, Accepted for: PerNEM, 2013.

Girlich, Franz; Rossberg, Michael; Schaefer, Guenter; Boehme, Thomas; Schreyer, Jens: Bounds for the Security of the Vivaldi Network Coordinate System, Accepted for: Netsys, 2013.

Trapp, Markus; Rossberg, Michael; Schaefer, Guenter: Scalable Multipath Exploration in Ad-Hoc Networks, Accepted for: Netsys, 2013.

Rossberg, Michael; Grey, Michael; Trapp, Markus; Girlich, Franz; Schaefer, Guenter: Automatic VPN-Configuration with Secure OverLay for IPsec Discovery, Accepted for: Netsys Demo Track, 2013.


Girlich, Franz; Rossberg, Michael; Schaefer, Guenter: On the Construction of Denial-of-Service-Resilient Overlay-Networks, CRITIS 2012.

Rossberg, Michael; Girlich, Franz; Schaefer, Guenter: Analyzing and Improving the Resistance of Overlay-Networks against Bandwidth Exhaustion Attacks, RNDM 2012.

Rossberg, Michael; Golembewski, Rene; Schaefer, Guenter: Attack-Resistant Distributed Time Synchronization for Virtual Private Networks, IEEE ICCCN, July 2012

Rene Golembewski, Tobias Gerlach, Guenter Schaefer: Efficient Communication for Large-scale Robust Image Processing with Smart Camera Devices, IEEE Symposium on Computational Intelligence for Security and Defense Applications (CISDA 2012), Ottawa, Canada

Michael Grey, Michael Rossberg, Guenter Schaefer: Automatic Creation of VPN Backup Paths for Improved Resilience against BGP-Attackers, ACM SAC, March 2012.

Sascha Grau: Attack-Resilient Multitree Data Distribution Topologies. In 16th International Conference On Principles Of DIstributed Systems, OPODIS 2012, LNCS 7702, pp. 196-208, Rome, Italy, December 2012  



R. K. Schmidt, A. Brakemeier, T. Leinmüller, F. Kargl, G. Schäfer. Advanced Carrier Sensing to Resolve Local Channel Congestion. In Proceedings of the 8th  International Workshop on VehiculAr Inter-NETworking (VANET), pages 11–20. ACM, 2011

M. Fischer, M. Kissmann, S. Grau and G. Schaefer. On Virtualization-based Network Support for Peer-assisted Live-Streaming Applications. Proceedings of Networks of the Future (NoF), Paris, France, November 2011.

M. Fischer, S. Delling, S. Grau and G. Schaefer. Underlay-Robust Application Layer Multicast. Extended Abstract. Proceedings of the International Performance Computing and Communications Conference (IPCCC). Orlando, Florida, November 2011.

M. Fischer, S. Grau, S. Kehr and G. Schaefer. Attack-Resilient and Multiple-Tree-based P2P-IPTV Distribution. In Proceedings of the International Congress of Ultra Modern Telecommunications and Control Systems (ICUMT), Best-Paper-Award, Budapest, Hungary, October 2011. 

T. Koellmer, M. Rossberg, G. Schaefer: Attributbasierter Schlüsselaustausch in virtuellen privaten Netzen, DACH security, pp. 522-533, September 2011.

R. Golembewski, M. Rossberg, G. Schaefer. Towards Smart Infrastructures for Modern Surveillance Networks. Future Security 2011 Berlin, Germany, September 2011.

S. Wozniak, G. Schaefer. Towards Information Services for Disaster Relief based on Mobile Social Networking. 6th Future Security Research Conference (Future Security 2011), Berlin, Germany, September 2011.

S. Grau, M. Fischer and G. Schaefer. On the Dependencies between Source Neighbors in Optimally DoS-stable P2P Streaming Topologies. Proceedings of the International Conference on Distributed Computing Systems (ICDCS). Minneapolis, USA, June 2011.

M. Rossberg: Skalierbare Autokonfiguration sabotageresistenter virtueller privater Netze, Cuvillier Verlag, Göttingen, June 2011.

M. Rossberg, G. Schaefer. A Survey on Automatic Configuration of Virtual Private Networks. Computer Networks Journal, Elsevier, Volume 55, Issue 8, June 2011.

S. Grau, M. Fischer, M. Brinkmeier, G. Schaefer. On Complexity and Approximability of Optimal DoS Attacks on Multiple-Tree P2P Streaming Topologies. IEEE Transactions on Dependable and Secure Computing, Vol. 8 No. 2, pp. 270-281, March-April 2011.

R. K. Schmidt, B. Kloiber, F. Schütter, T. Strang. Degradation of Communication Range in VANETs caused by Interference 2.0 - Real-World Experiment, 3rd International Workshop on Communication Technologies for Vehicles (Nets4Cars), Oberpfaffenhofen, Germany, 23.-24. März 2011.

S. Wozniak, T. Gerlach, G. Schaefer. Optimization-based Secure Multi-hop Localization in Wireless Ad Hoc Networks. Kommunikation in Verteilten Systemen 2011 (KiVS '11), Kiel, Germany, March 2011.

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Robert K. Schmidt ; Robert Lasowski ; Leinmüller, Tim ; Claudia Linnhoff-Popien ; Schäfer, Günter
An Approach for Selective Beacon Forwarding to Improve Cooperative Awareness, 2nd IEEE Vehicular Networking Conference (VNC), Jersey City, USA, 13.-15. Dezember 2010.

Schmidt, Robert K. ; Achim Brakemeier ; Leinmüller, Tim ; Böddeker, Bert ; Schäfer, Günter
Architecture for Decentralized Mitigation of Local Congestion in VANETs, 10th International Conference on ITS Telecommunications (ITST), Kyoto, Japan, 9.-11. November 2010.

Markus Trapp, Mathias Fischer and Guenter Schaefer.
Mobility-Aware Peer-to-Peer Live-Streaming. IFIP Wireless Days, Venedig, Italy, October 2010

Rossberg, Michael; Schaefer, Guenter; Martius Kai
Automatic configuration of complex IPsec-VPN and implications to higher layer network management. Information Security Solutions Europe (iSSE), pp. 334-342, Oktober 2010

Rossberg, Michael; Schaefer, Guenter; Martius Kai
Secure Overlay-Based Auto-configuration of Complex IPsec VPN. Future Security, September 2010

Rossberg, Michael; Schaefer, Guenter; Strufe, Thorsten
Distributed Automatic Configuration of Complex IPsec-Infrastructures. Journal of Network and Systems Management, Volume 18, Issue 3, pp. 300-326, September 2010

Schmidt, Robert K. ; Leinmüller, Tim ; Böddeker, Bert ; Schäfer, Günter
Adapting the Wireless Carrier Sensing for VANETs, 7th International Workshop on Intelligent Transportation (WIT 2010), Hamburg, Deutschland, 23.-24. März 2010.

Schmidt, Robert K. ; Leinmüller, Tim ; Schoch, Elmar ; Kargl, Frank ; Schäfer, Günter
Exploration of Adaptive Beaconing for Efficient Intervehicle Safety Communication. IEEE Network Magazine, Special Issue on Advances in Vehicular Communications Networks, Volume 24 , Issue 1 (January-February 2010) , pp. 14-19.

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Schaefer, Guenter
Sensor Network Security, updated Book chapter in R. Zurawski (ed.) „Embedded Systems Handbook, Second Edition: Networked Embedded Systems“, CRC Press, 2009

Schmidt, Robert K.; Koellmer, Thomas; Leinmueller, Tim; Boeddeker, Bert; Schaefer, Guenter
Degradation of Transmission Range in VANETS caused by Interference. Praxis der Informationsverarbeitung und Kommunikation (PIK), Special Issue on Mobile Ad-hoc Networks, Heft IV/2009

Brieg, Andreas; Brinkmeier, Michael; Grau, Sascha; Fischer, Mathias; Schaefer, Guenter
Attacker Independent Stability Guarantees for Peer-2-Peer-Live-Streaming Topologies. The Second International Conference on Communication Theory, Reliability, and Quality of Service, Colmar, France, July 2009 (received a best paper award)

Brinkmeier, Michael; Schaefer, Guenter, Strufe, Thorsten
Optimally DoS resistant P2P Topologies for Live Multimedia Streaming, IEEE Transactions on Parallel and Distributed Systems, Volume 20, Issue 6, June 2009

Brinkmeier, Michael; Rossberg, Michael; Schaefer, Guenter
Towards a Denial-of-Service Resilient Design of Complex IPsec Overlays, International Conference on Communications (ICC), June 2009

Rossberg, Michael; Schaefer, Guenter
Ciscos Group Encrypted Transport VPN – Eine kritische Analyse, D-A-CH security, May 2009

Rossberg, Michael; Steudel, Wolfgang; Schaefer, Guenter; Martius, Kai
Eine Software-Architektur zur Konstruktion flexibler IPsec-Infrastrukturen. 11. Deutscher IT-Sicherheitskongress, May 2009

Brinkmeier, Michael; Fischer, Mathias; Grau, Sascha; Schäfer, Günter; Strufe, Thorsten
Methods for Improving Resilience in Communication Networks and P2P Overlays. PIK - Praxis der Informationsverarbeitung und Kommunikation, Vol 32.,1/2009, pp. 64-78

Fischer, Mathias; Brinkmeier, Michael; Grau, Sascha;  Schäfer, Günter. Towards the design of unexploitable construction mechanisms for multiple-tree based P2P streaming systems. KiVS 2009, 16. ITG/GI-Fachtagung Kommunikation in Verteilten Systemen, 2.-6. März 2009, Kassel, Germany.  

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Henseler, Marcel; Rossberg, Michael; Schaefer, Guenter
Credential Management for Automatic Identification Solutions in Supply Chain Management. In: IEEE Transactions on Industrial Informatics. Volume 4, November 2008, pp. 308-314

Leinmüller, Tim; Schmidt, Robert K.; Schoch, Elmar; Held, Albert; Schaefer, Guenter
Modeling Roadside Attacker Behavior in VANETs. IEEE AutoNet, New Orleans, USA, December 2008

Fischer, Mathias; Strufe, Thorsten; Schmidt, Robert; Schaefer, Guenter
A Key Management Solution for Overlay-Live-Streaming. In: Proceedings of SecureComm 2008, Workshop on Security in Opportunistic and Social Networks, 22. - 25. September 2008, Istanbul, Turkey

Fischer, Mathias; Andersen, Frank-Uwe; Koepsel, Andreas; Schaefer, Guenter; Schlaeger, Morten
A Distributed IP Mobility Approach for 3G SAE. In: Proceedings of IEEE PIMRC, 15. -- 18. September 2008 Cannes, France

Schmidt, Robert K.; Leinmüller, Tim; Schoch, Elmar; Held, Albert; Schaefer, Guenter
Vehicle Behavior Analysis to Enhance Security in VANETs. IEEE V2VCOM, Eindhoven, Netherlands, June 2008

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Thorsten Strufe
Ein Peer-to-Peer-basierter Ansatz zur Live-Übertragung multimedialer Datenströme, Dissertation

Wildhagen, Strufe, Schäfer
Netzwerkeffizienz stabiler Overlay-Streaming-Topologien (Network Efficiency of Stable Overlay Streaming Topologies), it - Information Technology, Oldenbourg, Volume 49, 2007, pp. 304 -- 311.

Thorsten Strufe, Jens Wildhagen and Günter Schäfer
Towards the construction of Attack Resistant and Efficient Overlay Streaming Topologies, Electronic Notes in Theoretical Computer Science, Elsevier, Volume 179, 2007, pp. 111 -- 121.
(A previous version of this paper appeared at the workshop "Security and Trust Management 2006")

Michael Rossberg, Thorsten Strufe, Günter Schäfer
Using Recurring Costs for Reputation Management in Peer-to-Peer Streaming Systems, SecureComm 2007, 17. – 21. September 2007, Nice, France.

Kraft, Schäfer
Verhaltensbeobachtung und -bewertung zur Vertrauensbildung in offenen Ad-hoc-Netzen, KiVS 2007, 15. ITG/GI-Fachtagung Kommunikation in Verteilten Systemen, 26. February – 2. March 2007, Bern, Switzerland

Strufe, Wildhagen,Schäfer
Netzwerkeffizienz stabiler Overlay-Streaming-Topologien, KiVS 2007, 15. ITG/GI-Fachtagung Kommunikation in Verteilten Systemen, 26. February – 2. March 2007, Bern, Switzerland, pp. 3 -- 14.

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Thorsten Strufe, Jens Wildhagen and Günter Schäfer
Towards the construction of Attack Resistant and Efficient Overlay Streaming Topologies, ESORICS, Workshop on Security and Trust Management (STM) 2006, 20 September 2006, Hamburg, Germany, pp. 108 -- 118. (STM'06)

Christian Hoene, Ian Marsh, Günter Schäfer, Adam Wolisz
Error Propagation After Concealing a Lost Speech Frame. Workshop on Multimedia Communication: State of the Art and Future Directions. IEEE International Conference on Communications (ICC'06), 11-15 June 2006, Istanbul, Turkey

Thorsten Strufe, Günter Schäfer, Arthur Chang
BCBS: An Efficient Load Balancing Strategy for Cooperative Overlay Live-Streaming, General Symposium of the IEEE International Conference on Communications (ICC'06), 11-15 June 2006, Istanbul, Turkey

Sven Hermann, Adam Wolisz, Michael Lipka, Günter Schäfer
Concept for Hierarchical and Distributed Processing of Area Based Triggers, IEEE International Conference on Pervasive Computer and Communications (PerCom'06), 13-17 March 2006, Pisa, Italy

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Patrick Diebold, Andreas Hess, Günter Schäfer
A Honeypot Architecture for Detecting and Analyzing Unknown Network Attacks. KiVS 2005 · 14. ITG/GI-Fachtagung Kommunikation in Verteilten Systemen, Kaiserslautern, Germany, 28.2.-3.3.2005, in Fachberichte Informatik, Müller, P., Gotzhein, R., Schmitt, J.B. (Hrsg.), Springer Verlag, 2005, pp. 245-255.

G. Schaefer
Sensor Network Security. In R. Zurawski (ed.), The Embedded Systems Handbook, CRC Press, 2005, pp. 39-1 - 39-23.

T. Chen, M. Sortais, G. Schaefer, S. Adams, C. Fan, A. Wolisz
Performance Analysis of a Denial of Service Protection Scheme for Optimized and QoS-aware Handover. Computer Network, Vol. 49, No. 3, pp. 449-464, Elsevier, Netherlands

G. Schaefer
Sabotageangriffe auf Kommunikationsinfrastrukturen: Angriffstechniken und Abwehrmaßnahmen. Praxis der Informationsverarbeitung und Kommunikation (PIK), K. G. Saur Verlag, München, Germany, Vol. 28, 2005, No. 3, pp. 130 - 139

G. Schaefer
Information Technology Handbook, CRC Press, 2005. pp. 35-1 - 35-12

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