The decentrality of Peer-to-Peer networks is a fundamental problem for their security. We are interested in way to secure Peer-to-Peer networks that add as little as possible centralized or external resources. In this context we are also studying trust metrics that can be used to evaluate nodes.

We conduct measurements in overlay networks. This includes the typical traffic and connection parameters as well as topological information. Interesting questions are: What kind of information can be obtained by passive monitoring? Where do we need active measurement? Do we need support from the underlay? What is useful for optimizing and operate overlays? This research is strongly related to SpoVNet project.

Online games are an interesting challenge and chance for the future development of the Peer-to-Peer paradigm. A wide variety of aspects of only theoretically solved and especially yet completely unsolved problems are covered by this application. We are investigaing Peer-to-Peer methods for Massively Multiplayer Online Games (MMOGs), shooters, and other games. Additionally, we are interested in the spontaneous  establishment of a Peer-to-Peer network for an instance of a game.