http://www.tu-ilmenau.de

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Contact Person

Prof. Dr.-Ing. Günter Schäfer

Phone +49 3677 69 4576

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INHALTE

Prof. Dr.-Ing. Günter Schäfer

Consultation-hour: Monday, 1pm - 2pm
Office: Zusebau, Room 3042
Phone: +49 3677 694576
Email: guenter.schaefer[at]tu-ilmenau.de 

Research

My research areas network security, mobile communications, high performance communication systems, and network management. I'm a member of the DFG research training group "Self-organizing Mobile Communication Systems for Disaster Scenarios". For more information about my reasearch topics refer to my publications and my curriculum vitae.

Activities in Organisation and University Self-Administration

Membership in Program Committees

Publications

[WST19]Wendland, Philip; Schaefer, Guenter; Thomä, Reiner: An Application-Oriented Evaluation of LTE-V’s Mode 4 for V2V Communication, ACM SAC, 2019. Accepted and in press.
[KASS18]Kabirov, Airat D.; Anikin, Igor V.; Schatz, David; Schaefer Guenter: Scalable and Anonymity Preserving Overlays for Voice over IP Communications, IEEE Dynamics, 2018.
[GTRS18]Grey, Michael; Theil, Markus, Rossberg, Michael; Schaefer, Guenter: Towards Voronoi-Based Backup Routing for Large-Scale Distributed Applications. 2018 IEEE Global Information Infrastructure and Networking Symposium (GIIS 2018). Thessaloniki, Greece, October 2018. [Paper (pdf, 1.9Mb)]
[BTRSS18]Backhaus, Martin; Theil, Markus; Rossberg Michael; Schaefer, Guenter; 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, Spain. October 2018. [Paper (pdf, 1.9Mb)]
[BTRS18]Backhaus, Martin; Theil, Markus; Rossberg Michael; Schaefer, Guenter: 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, Cyprus. October 2018. [Paper (pdf, 1.9Mb)]
[SRS17]Schatz, David; Rossberg, Michael; Schaefer, Guenter: Reducing Call Blocking Rates For Anonymous Voice Over IP Communications, IEEE ICUMT, 2017.
[RT17]Michael Rossberg, Markus Theil: Secure Enrollment of Certificates Using Short PINs, Proceedings of the 12th International Conference on Availability, Reliability and Security, September 2017.
[BRS17]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.
[RGS17]Michael Rossberg, Franz Girlich, Guenter Schaefer, David Ristow: Effiziente Überwachung komplexer mehrschichtiger Netzinfrastrukturen, 15. Deutscher IT-Sicherheitskongress, May 2017.
[BaSc17c]Backhaus, Martin; Guenter Schaefer: Worst-Case Attacker Models for Two-Layered Networks Based on the Minimum Overlay Cut, IEEE ISCC, 2017.
[BaSc17b]Backhaus, Martin; Guenter Schaefer: Towards Optimally Resilient Topologies against Optimal Attacks, IEEE/IFIP DISSECT, 2017. Best Paper Award.
[BaSc17a]Backhaus, Martin; Guenter Schaefer: Towards Construction of Efficient and Optimally Resilient VPN Topologies by Exactly Calculating Maximum Disjoint Paths, IEEE ICC, 2017.
Guenter Schaefer, Michael Rossberg: Security in Fixed and Wireless Networks. 2nd Edition, Wiley, ISBN: 978-1-119-04074-3, 624 pages, October 2016 [more information]

 [TRS16]

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

Sebastian Kehr, Milos Panic, Eduardo Quiñones, Bert Böddeker, Jorge Becerril Sandoval, Jaume Abella, Francisco J. Cazorla, Günter Schäfer: 

Supertask: Maximizing runnable-level parallelism in AUTOSAR applications. 2016 Design, Automation & Test in Europe Conference & Exhibition, DATE 2016, Dresden, Germany, March 14-18, 2016. IEEE 2016.

[BaSc16]Backhaus, Martin und Schaefer, Guenter: Backup Paths for Multiple Demands in Overlay Networks, GIIS, Oktober 2016.
[GRS15]Girlich, Franz; Rossberg, Michael; Schaefer, Guenter: On the resistance of overlay networks against bandwidth exhaustion attacks, Springer Telecommunication Systems Journal, March 2015 
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.
[GTRS15]Grey, Michael; Theil, Markus; Rossberg, Michael; Schaefer, Guenter: Towards a Model for Global-Scale Backbone Networks, IEEE ICC, 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
[ScRo14]Schaefer, Guenter; Rossberg, Michael: Netzsicherheit, dpunkt.verlag, Juli 2014. [more information]
[GSRS14]Grey, Michael; Schatz, David; Rossberg, Michael; Schaefer, Guenter: Towards Distributed Geolocation by Employing a Delay-Based Optimization Scheme, IEEE ISCC, 2014.
[WRGS13]Wozniak, Sander; Rossberg, Michael; Girlich, Franz; Schaefer, Guenter: Geocast into the Past: Towards a Privacy-Preserving Spatiotemporal Multicast for Cellular Networks. Accepted for: IEEE ICC, 2013.
[GTRSM13]Grey, Michael; Trapp, Markus; Rossberg, Michael; Schaefer, Guenter; Martius, Kai: Skalierbare Lastbalancierung autokonfigurierter VPN. Accepted for: 13. Deutscher IT-Sicherheitskongress, 2013.
[WRS13]Wozniak, Sander; Rossberg, Michael; Schaefer, Guenter: Towards Trustworthy Mobile Social Networking Services for Disaster Response. Accepted for: PerNEM, 2013.
[GRSBS13]Girlich, Franz; Rossberg, Michael; Schaefer, Guenter; Boehme, Thomas; Schreyer, Jens: Bounds for the Security of the Vivaldi Network Coordinate System, Accepted for: Netsys, 2013.
[TRS13]Trapp, Markus; Rossberg, Michael; Schaefer, Guenter: Scalable Multipath Exploration in Ad-Hoc Networks. Accepted for: Netsys, 2013.
[RGTGS13]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.
[GRS12b]Girlich, Franz; Rossberg, Michael; Schaefer, Guenter: On the Construction of Denial-of-Service-Resilient Overlay-Networks. CRITIS 2012.
[RGS12b]Rossberg, Michael; Girlich, Franz; Schaefer, Guenter: Analyzing and Improving the Resistance of Overlay-Networks against Bandwidth Exhaustion Attacks. RNDM 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
[RGS12a]Rossberg, Michael; Golembewski, Rene; Schaefer, Guenter: Attack-Resistant Distributed Time Synchronization for Virtual Private Networks, IEEE ICCCN, July 2012.  

[GRS12a]

Grey, Michael; Rossberg, Michael; Schaefer, Guenter: Automatic Creation of VPN Backup Paths for Improved Resilience against BGP-Attackers, ACM SAC, March 2012.
[FKGS11]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.
[FDGS11]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.
[FGKS11]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.
[WS11]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.
[GRS11]R. Golembewski, M. Roßberg, G. Schaefer. Towards Smart Infrastructures for Modern Surveillance Networks. Future Security 2011 Berlin, Germany, September 2011.
[RS11]M. Rossberg, G. Schaefer. A Survey on Automatic Configuration of Virtual Private Networks. Computer Networks Journal, Elsevier, Volume 55, Issue 8, June 2011.
[GFS11]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.
[GFBS11]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.
[WGS11]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.
[SLLL+10]R. Schmidt, R. Lasowski, T. Leinmüller, C. Linnhoff-Popien, G. Schaefer. An Approach for Selective Beacon Forwarding to Improve Cooperative Awareness. 2nd IEEE Vehicular Networking Conference (VNC), Jersey City, USA, 13.-15. Dezember 2010.
[RBLB+10]R. Schmidt, A. Brakemeier, T. Leinmüller, B. Böddeker, G. Schaefer. Architecture for Decentralized Mitigation of Local Congestion in VANETs. 10th International Conference on ITS Telecommunications (ITST), Kyoto, Japan, 9.-11. November 2010.
[RSM10a]M. Roßberg, G. Schäfer, K. Martius. Automatic Configuration of Complex IPsec-VPN and Implications to Higher Layer Network Management. Information Security Solutions Europe (ISSE), Oktober 2010, Berlin, Germany.
[TFS10]M. Trapp, M. Fischer, and G. Schäfer. Mobility-Aware Peer-to-Peer Live-Streaming. IFIP Wireless Days, Venice, Italy, October 2010. (awarded with a Student Travel Grant)
[RSM10]M. Roßberg, G. Schäfer, K. Martius. Secure Overlay-Based Autoconfiguration of Complex IPsec VPN. Future Security, September 2010, Berlin, Germany.
[RSS10]M. Rossberg, G. Schaefer, T. Strufe. Distributed Automatic Configuration of Complex IPsec-Infrastructures. Journal of Network and Systems Management, Volume 18, Issue 3, pp. 300-326, September 2010.
[SLBS10]R. Schmidt, T. Leinmüller, B. Böddeker, G. Schaefer. Adapting the Wireless Carrier Sensing for VANETs. 7th International Workshop on Intelligent Transportation (WIT 2010), Hamburg, Deutschland, 23.-24. März 2010.
[SLSK+10]R. K. Schmidt, T. Leinmueller, E. Schoch, F. Kargl, G. Schaefer. Exploration of Adaptive Beaconing for Efficient Intervehicle Safety Communication. IEEE Network (special issue on “Advances in Vehicular Communications Networks”), Vol. 24, Issue 1, January/February 2010.
[SKLB+09]R. K. Schmidt, T. Koellmer, T. Leinmueller, B. Boeddeker, G. Schaefer. Degradation of Transmission Range in VANETs caused by Interference. Praxis der Informationsverarbeitung und Kommunikation (PIK), Vol. 32, No. 4, Dezember 2009.
[BBGF+09]A. Brieg, M. Brinkmeier, S. Grau, M. Fischer, and G. Schäfer. 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. (Best Paper Award)
[BSS09]M. Brinkmeier, G. Schäfer, T. Strufe. Optimally DoS resistant P2P Topologies for Live Multimedia Streaming. IEEE Transactions on Parallel and Distributed Systems, Vol. 20, No. 6, June 2009.
[BRS09]M. Brinkmeier, M. Roßberg, G. Schäfer. Towards a Denial-of-Service Resilient Design of Complex IPsec Overlays. IEEE International Conference on Communications (ICC 2009) – Communication and Information Systems Security Symposium, June 14-18, 2009, Dresden, Germany.
[RS09]M. Roßberg, G. Schaefer. Ciscos Group Encrypted Transport VPN – Eine kritische Analyse. D-A-CH Security 2009, Ruhr-Universität Bochum, Mai 2009.
[RSSM09]M. Roßberg, W. Steudel, G. Schäfer, K. Martius. Eine Software-Architektur zur Konstruktion flexibler IPsec-Infrastrukturen. 11. Deutscher IT-Sicherheitskongress, Mai 2009, Bonn, Germany.
[FBGS09]M. Fischer, M. Brinkmeier, S. Grau,  G. Schäfer. 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. 
[BFGS+09]M. Brinkmeier, M. Fischer, S. Grau, G. Schäfer, T. Strufe. Methods for Improving Resilience in Communication Networks and P2P Overlays. Praxis der Informationsverarbeitung und Kommunikation (PIK), Vol. 32, 1/2009, pp. 64-78, K. G. Saur Verlag, München, Germany.
[S09]G. Schäfer. Sensor Network Security. updated Book chapter in R. Zurawski (ed.) „Embedded Systems Handbook, Second Edition: Networked Embedded Systems“, CRC Press, 2009.
[LSSH+08]T. Leinmüller, R. K. Schmidt, E. Schoch, A. Held, G. Schäfer. Modeling Roadside Attacker Behavior in VANETs. IEEE AutoNet, December 2008, New Orleans, USA.
[HRS08]

M. Henseler, M. Rossberg,  G. Schaefer. Credential Management for Automatic Identification Solutions in Supply Chain Management. IEEE Transactions on Industrial Informatics, Volume 4, pp. 308-314, November 2008.

[FSSS08]M. Fischer, T. Strufe, R. Schmidt, G. Schäfer. A Key Management Solution for Overlay-Live-Streaming. Proceedings of SecureComm 2008, Workshop on Security in Opportunistic and Social Networks, 22. - 25. September 2008, Istanbul, Turkey.
[FAKS+08]

M. Fischer, F.-U. Andersen, A. Koepsel, G. Schäfer, M. Schlaeger. A Distributed IP Mobility Approach for 3G SAE. Proceedings of IEEE PIMRC 2008, September 2008 Cannes, France.

[SLSA+08]R. K. Schmidt, T. Leinmüller, E. Schoch, A. Held, G. Schäfer. Vehicle Behavior Analysis to Enhance Security in VANETs. IEEE  V2VCOM, June 2008, Eindhoven, Netherlands.
[SWS07c]T. Stufe, J. Wildhagen, G. Schäfer. Netzwerkeffizienz stabiler Overlay-Streaming-Topologien. "it - Information Technology", Sonderheft Peer-to-Peer, Oktober 2007, Oldenbourg Verlag.
[SWS07b]T. Strufe, J. Wildhagen, G. Schäfer. Towards the Construction of Attack Resistent and Efficient Overlay Streaming Topologies. Electronic Notes in Theoretical Computer Science, Vol. 179, pp. 111-121, Elsevier, September 2007.
[RSS07]M. Roßberg, T. Strufe, G. Schäfer. Using Recurring Costs for Reputation Management in Peer-To-Peer Streaming Systems. 3rd International Conference on Security and Privacy in Communication Networks (IEEE SecureComm 2007), September 17-20, 2007, Nice, France.
[SWS07a]T. Stufe, J. Wildhagen, G. Schäfer. Netzwerkeffizienz stabiler Overlay-Streaming-Topologien. KiVS 2007, 15. ITG/GI-Fachtagung Kommunikation in Verteilten Systemen, 26. February - 2. March 2007, Bern, Switzerland
[KS07]D. Kraft, G. 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.
[SWS06]T. Strufe, J. Wildhagen, G. Schäfer. Towards the Constuction of Attack Resistent and Efficient Overlay Streaming Topologies. Workshop for Security and Trust Management (STM) at ESORICS 2006, September 2006, Hamburg, Germany
[SSC06]T. Strufe, G. Schäfer, A. 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
[HMSW06]C. Hoene, I. Marsh, G. 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
[HLSW06]S. Hermann, A. Wolisz, M. Lipka, G. 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
[DHS05]P. Diebold, A. Hess, G. 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.

[Sch05a]

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

[CSS+05]

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.

[Sch05b]

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
[Sch05c]G. Schaefer. Internet Firewalls. in R. Zurawski, The Industrial Information Technology Handbook, CRC Press, 2005. pp. 35-1 - 35-12
[SKS04a]D. Sisalem, J. Kuthan, G. Schaefer. DoS Attacks on SIP Infrastructures. Workshop on VoIP Security – Challenges and Solutions, Globecom'2004, November 2004, Dallas, Texas, USA.
[LRSW04a]L. Westerhoff, S. Reinhardt, G. Schaefer, A. Wolisz. Security Analysis and Concept for the Multicast-Based Handover Support Architecture MOMBASA. Globecom'2004, November 2004, Dallas, Texas, USA.
[CSSW04a]T. Chen, G. Schaefer, M. Sortais, A. Wolisz. A Performance Study of Session State Re-establishment Schemes in IP-based Micro-mobility Scenarios. 12th Annual Meeting of the IEEE / ACM International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS), October 2004, Volendam, The Netherlands.
[HS04b]A. Hess, G. Schäfer. Realizing a flexible Access Control Mechanism for Active Nodes based on Active Networking Technology. 2004 IEEE International Conference on Communications (ICC 2004), 20.-24. June 2004, Paris, France.
[HGGS04a]A. Hess, T. Gingold, S. R. Garzon, G. Schäfer. Intrusion Prevention with Active Networks: A Performance Comparison between User and Kernel-Space Implementation. 18. DFN-Arbeitstagung über Kommunikationsnetze, June 2004, Düsseldorf, Germany.
[CSF+04a]T. Chen, G. Schäfer, C. Fan, S. Adams, M. Sortais, A.Wolisz.Denial of Service Protection for Optimized and QoS-aware Handover Based on Localized Cookies. 5th European Wireless Conference - Mobile and Wireless Systems beyond 3G , February 24-27, 2004, Barcelona, Spain.
[HS04a]A. Hess, G. Schäfer. ISP-Operated Protection of Home Networks with FIDRAN. First IEEE Consumer Communications and Networking Conference (CCNC'2004), January 2004, Las Vegas, Nevada, USA.
[KS04a]D. Kraft, G. Schäfer. Distributed Access Control for Consumer Operated Mobile Ad-hoc Networks. First IEEE Consumer Communications and Networking Conference (CCNC'2004), January 2004, Las Vegas, Nevada, USA.
[Sch03b]G. Schäfer. Security in Fixed and Wireless Networks. John Wiley & Sons, Ltd, UK, 2003.
[FCF+03a]X. Fu, T. Chen, A. Festag, H. Karl, G. Schäfer, C. Fan. Secure, QoS-Enabled Mobility Support for IP-based Networks. IP Based Cellular Network Conference (IPCN 2003), December 2003, Paris, France.
[HJS03b]A. Hess, M. Jung, G. Schäfer. Combining Multiple Intrusion Detection and Response Technologies in an Active Networking Based Architecture. 17. DFN-Arbeitstagung über Kommunikationsnetze, June 2003, Düsseldorf, Germany.
[HJS03a]A. Hess, M. Jung, G. Schäfer. FIDRAN: A flexible Intrusion Detection and Response Framework for Active Networks. 8th IEEE Symposium on Computers and Communications (ISCC'2003), July 2003, Kemer, Antalya, Turkey.
[Sch03a]G. Schäfer. Netzsicherheit - Algorithmische Grundlagen und Protokolle. dpunkt.verlag, 2003.
[HS03a]A. Hess, G. Schäfer. A Flexible and Dynamic Access Control Policy Framework for an Active Networking Environment. Kommunikation in Verteilten Systemen (KiVS 2003), February 2003, Leipzig, Germany.
[HS02a]A. Hess, G. Schäfer. Performance Evaluation of AAA / Mobile IP Authentication. 2nd Polish-German Teletraffic Symposium (PGTS'02), September 2002, Gdansk, Poland.
[Sch02a]G. Schäfer. Research Challenges in Security for Next Generation Mobile Networks. Workshop on Pioneering Advanced Mobile Privacy and Security (PAMPAS), September 2002, Royal Holloway University of London, Egham, Surrey, United Kingdom.
[BS02b]R. Blanco, G. Schäfer. On Securing Wireless LANs and Supporting Nomadic Users with Microsoft’s IPSec Implementation. MS Summer Research Workshop, September 2002, Cambridge, UK.
[HSSZW02a]A. Hess, M. Schöller, G. Schäfer, M. Zitterbart, A. Wolisz. A dynamic and flexible Access Control and Resource Monitoring Mechanism for Active Nodes. OpenArch 2002, July 2002, New York, USA.
[BS02a]R. Blanco, G. Schäfer. Securing 802.11-WLANs Using VPN Technology with Support for Nomadic Users. WLAN Security' 02, June 2002, Paris, France.
[PSS01b]F. Pählke, G. Schäfer, J. Schiller. Multilateral sichere Mobilitätsunterstützung für IP-Netze: Paketfilter- und Tunnelkonfiguration. Praxis der Informationsverarbeitung und Kommunikation (PIK), 24. Jahrgang 2001, K. G. Saur Verlag, München, Germany.
[SE01a]G. Schäfer, M. Eyrich. A Simple Key Distribution Method for IEEE 802.11 Encryption Keys. Workshop on "Mobile Communication over Wireless LAN: Research and Applications", 31. Jahrestagung der Deutschen Gesellschaft für Informatik, Jahrestagung der Österreichischen Computer Gesellschaft, September 2001, Vienna, Austria.
[BRSS01a]M. Bechler, H. Ritter, G. Schäfer, J. Schiller. Traffic Shaping in End Systems Attached to QoS-supporting Networks. 6th IEEE Symposium on Computers and Communications (ISCC'2001), July 2001, Hammamet, Tunisia.
[SW01a]G. Schäfer, D. Westhoff. Communication Privacy in IP-based Architectures. Presentation, Wireless World Research Forum (WWRF) second working session, May 2001, Helsinki, Finnland.
[KS01a]H. Karl, G. Schäfer. Location Privacy for Mobile Internet Access. Presentation, IP Based Cellular Network Conference (IPCN 2001), May 2001, Paris, France.
[PSS01a]F. Pählke, G. Schäfer, J. Schiller. Paketfilter- und Tunnelkonfiguration zur Firewall-verträglichen Mobilitätsunterstützung in IP-Netzen. Kommunikation in Verteilten Systemen (KiVS 2001), February 2001, Hamburg, Germany.
[KST00a]H. Koraitim, G. Schäfer, S. Tohmé. Quality of Service Aspects of Transport Technologies for the UMTS Radio Access Network. IFIP Conference on Personal Wireless Communications (PWC2000), September 2000, Gdansk, Poland.
[MPSS00a]S. Mink, F. Pählke, G. Schäfer, J. Schiller. Towards Secure Mobility Support for IP Networks. International Conference on Communication Technologies (ICCT 2000), August 2000, Peking, China.
[MPSS00b]

S. Mink, F. Pählke, G. Schäfer, J. Schiller. FATIMA – A Firewall-Aware Transparent Internet Mobility Architecture. ISCC'2000, July 2000, Antibes, France.

[MPSS00c]S. Mink, F. Pählke, G. Schäfer, J. Schiller. Security Aspects of Micro-Mobility Supporting Architectures for IP Networks. IP Based Cellular Network Conference (IPCN 2000), May 2000, Paris, France.
[Sch98a]

G. Schäfer. Efficient Authentication and Key Management in High Performance Networks (in German). Ph.D. thesis at the Faculty of Informatics, October 1998, University of Karlsruhe, Germany.

[MSS98a]

D. Müller, G. Schäfer, J. Schiller. An Efficient Authentication Protocol for High Performance Networks. Globecom '98, November 8-12, 1998, Sydney, Australia.

[SSW98a]

G. Schäfer, J. Schiller, A. Will. Using Smart Cards in a Networked Environment: A Client Server Approach. IASTED International Conference on Networks and Communication Systems, May 13-16, 1998, Pittsburgh, PA, USA.

[ESSS98a]

J. Elstner, G. Schäfer, J. Schiller, J. Seitz. A Comparison of Current Approaches to Securing ATM Networks. 6th International Conference on Telecommunication Systems, March 5-8, 1998, Nashville, TN, USA.

[CSS96a]

G. Carle, G. Schäfer, J. Schiller. An Approach to Hardware-Supported Accounting Management in ATM-Networks. In Proceedings of the 8th IEEE Workshop on Local and Metropolitan Area Networks, August 25-28, 1996, Berlin/Potsdam, Germany.

[CSS96b]

G. Carle, G. Schäfer, J. Schiller. Flexible Design of Hardware-Supported High Performance Protocol Processing Units. In Proceedings of the 5th Open Workshop on High Speed Networks, March 20-21, 1996, Paris, France.

[SSS96a]

G. Schäfer, J. Schiller, J. Seitz. A Toolkit for Rapid Prototyping of Expert Systems for Integrated Network Management. In Proceedings of the 14. IASTED International Conference on Applied Informatics, February 10-22, 1996, Innsbruck, Austria.

[SS96a]

G. Schäfer, J. Seitz. Integrating Agent-Functionality into Distributed Applications. In Proceedings of the IASTED International Conference on Networks, January 8-10, 1996, Orlando, Florida, USA.

[SS95a]

G. Schäfer, Jochen Seitz. Managing Agent Systems: A Key Issue for Dealing with Complexity. In Proceedings of the Intelligent Agents Workshop, November 23, 1995, Oxford Brookes University, Oxford, England.