Dr.-Ing. Nicolas Liebau

Research Area

Peer-to-Peer Networking

The Peer-to-Peer (P2P) Paradigm is a communication paradigm that tries to avoid any central entity in a network by useing efficiently the resources available at the end nodes of the network. The charakteristics of a Peer-to-Peer systems are:

  • Peers (=end-systems) form an overlay network
  • Peers offer and consume services and resources
  • Peers have significant autonomy
  • Self-organizing system
  • Services are exchanged between any participating peers

Important as well:

  • Heterogeneous peers
  • Permantent connectivity of individual peers cannot be assumed
    • e.g. support of dial-up users with variable IP addresses,
    • e.g. behind firewalls
    • e.g. operating outside the domain name system (DNS)

P2P became famous with file sharing applications like Napster, Gnutella, eDonkey, KaZaA, BitTorrent, etc. However, the application domain of the P2P paradigm is not limited to file sharing, as the example of Skype proves. At KOM we are looking into new application scenarios beyond file sharing.

My research interest in the area of P2P is specially:

Peer-to-Peer Networking - Technology

Peer-to-Peer Networking - Applications & Economics

Peer-to-Peer Gaming

  • Distributing the basic functionality required for gaming
  • Preventing cheating
  • Enhancing the gaming experience and fun by improving the P2P networking performance

Research Topics

Trusted Accounting in P2P Environments


Other Professional Activities

                • Supervisory board of motionet AG, Düsseldorf (Vice Chair)



Scholarships and Awards

  • Dissertation with distinction ("summa cum laude")
  • Scholarship with the goal of dissertation (Dr.-Ing.) for within DFG Reasearch Group "System Integration for Ubiquitous Calculations in Information Technology"
  • "Best Paper Award", KiVS 2005

Current Projects

  • QuaP2P: DFG Forschergruppe  "Verbesserung der Qualität von Peer-to-Peer-Systemen durch die systematische Erforschung von Qualitätsmerkmalen und deren wechselseitigen Abhängigkeiten" (FOR 733)
    This DFG Research Group researches systematically the quality of p2p systems. We have structured quality of p2p-systems into different quality aspects. We at KOM research the quality aspects adaptivity and efficiency. For our research results please see the publications of Aleksandra Kovacevic and Kalman Graffi.
  • EU Network of Excellence "CONTENT"
    Within this Network of Excellence we research new mechanisms for efficient p2p-based distribution of stored content. Our mechanism will enable BitTorrent like performance across different files. This allows combining the swarming mechanism know from BitTorrent with the long tail effect known from first and second generation p2p filesharing applicaitons. Further, smaller files will be distributed much more efficiently than compared to BitTorrent. Initial results are published here; further check Sebastian Kaune's page for recent updates.
  • EU SmoothIT
    This project aims at managing the enormous traffic created by p2p applications today. The approach we use to resolve this challenge is Economic Traffic Management. We try to achieve a win-win-win situation by creating situations where all stakeholders (ISPs, application providers, endusers) in a p2p application benefit from applying our mechanims. For research results on SmoothIT see the Konstantin Pussep's and Osama Abboud's pages.
  • BMBF Premium Services
    The goal of this project is to research pricing strategies for commercial p2p applications. Most pricing schemes today are not appropriate for commercial p2p applications, as the availability of some information is assumed in order to calculate market prices. Therefore, we will focus on the development of a fully decentralised, efficient, but still secure auctioning mechanism for p2p system.
  • PeerfactSim.KOM
    PeerfactSim.KOM is a simulator for p2p system. We use and extend it continuously within all of our research projects.


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Date Title Name of the event Organiser Location
Nov 21, 2008Token-based Accounting in P2P-Systems PromotionTU DarmstadtDarmstadt, Germany
Oct 27, 2008Token-based Accounting in P2P-Systems Kolloquium der Communcation Systems Group der Universität ZürichUniverität DarmstadtZurich, Switzerland
Oct 16, 2008Trusted Accounting in Peer-to-Peer Systems Content Plenary MeetingEU NoE ContentParis, France
Oct 06, 2008SmoothIT WP3: Current Status, Planning of Next Steps SmoothIT 3rd Plenary MeetingSmoothIT-ProjektLimassol, Cyprus
Sep 10, 2008Demo Session 2 at P2P'08 P2P'08P2P'08Istanbul, Turkey
Sep 09, 2008Demo-Session 1 at P2P'08 P2P'08P2P'08Istanbul, Turkey
Sep 08, 2008Tutorials at P2P'08 Tutorials of P2P'08P2P'08Istanbul, Turkey
Sep 08, 2008Tutorials at P2P'08 Tutorials of P2P'08P2P'08Istanbul, Turkey
Aug 26, 2008Benchmarking of Distributed Systems Dagstuhl Seminar „Benchmarking of Future Content Distribution“EU NoE ContentDagstuhl, Germany
Aug 05, 2008Globase.KOM - A P2P Overlay for Fully Retrievable Location-based Search Workshop on "Economic Traffic Management" organized by EC-GIN, SmoothIT, and EMANICSUniversität Zürich Zurich, Switzerland
May 07, 2008Decentralized and Self-Organizing IT-Infrastructures for Crisis Response and Management ISCRAM 2008International Community on Information Systems for Crisis Response and ManagementWashington D.C., USA
Jan 10, 2008SmoothIT WP3 - Overview and Tasks 1st Plenary MeetingEU SmoothITZurich, Switzerland
Jan 09, 2008Overview over the Multimedia Communications Lab 1st Plenary MeetingEU SmoothITZurich, Switzerland
Oct 30, 2007Peer-to-Peer: Anwendungsszenarien und technologischer Überblick T-Systems MMS Innovation Day zu Peer-to-PeerT-Systems MMSDresden, Germany
Oct 30, 2007The Impact of the P2P Paradigm on the New Media Industries T-Systems MMS Innovation Day zu Peer-to-PeerT-Systems MMSDresden, Germany
Oct 16, 2007Research Activities within TA2 of CONTENT 5th Plenary Meetng of EU NoE CONTENTEu NoE CONTENTKrakow, Poland
Oct 03, 2007Research activities and collaboration within TA2 of CONTENT 1st Review of EU NoE CONTENTEU CommisionBrussels, Belgium
Aug 12, 2007The Impact Of The P2P Paradigm On The New Media Industries AMCIS 2007AISKeystone, Colorado, USA
Jul 16, 2007The Impact of the Peer-to-Peer paradigm on the New Media Industries Premium Jour FixBMBF Premium ProjektDarmstadt, Germany
Apr 24, 2007Vertrauenswürde Spielemechanismen basierend auf Peer-to-Peer Technologien Abschlußbegutachtung des HMWK-Projektshttc e.V.Darmstadt, Germany