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The Complex Facets of Reputation and Trust Karl Aberer, Zoran Despotovic, Wojciech Galuba and Wolfgang Kellerer
 

Summary: The Complex Facets of Reputation and Trust
Karl Aberer, Zoran Despotovic, Wojciech Galuba and Wolfgang Kellerer
Summary. Trust and reputation systems have proven to be essential to enforc-
ing cooperative behavior in peer-to-peer networks. We briefly describe the current
approaches to building reputation systems: social networks formation, probabilis-
tic estimation, and game theoretic models. We then observe that all of the current
models make a number of simplifying assumptions that may not necessarily hold in
real networks, such as either irrational (probabilistic) or completely rational behav-
ior, instant propagation of reputation information and homogeneity of interactions.
We argue that dropping those assumptions and allowing more degrees of freedom
is necessary in order to construct more realistic and richer reputation models. We
support our argument by citing reputation research done in economics, evolution-
ary psychology, biology, and sociology, and consider models that take into account
adaptive behavior changes, co-evolution of behaviors, bounded rationality, and vari-
able interaction patterns. We then outline how those complexities can be dealt with
and point out main directions for the future study of more realistic and less con-
strained reputation models that can potentially lead to construction of more secure,
responsive, and cooperative peer-to-peer systems.
1 Introduction
Reputation systems have proven to be essential to enforcing cooperative be-

  

Source: Aberer, Karl - Faculté Informatique et Communications, Ecole Polytechnique Fédérale de Lausanne

 

Collections: Computer Technologies and Information Sciences