A comparison of reputation-based trust systems

Recent literature contains many examples of reputation systems which are constructed in anad hoc way or rely upon some heuristic which has been found to be useful. However,comparisons between these reputation systems has been impossible because there are noestablished methods of comparing performance. This paper introduces a simulationframework which can be used to perform comparison analysis between reputation models.Two reputation models, one from Abdul-Rahman and Hailes (ARH) [1], and one from Mui,Mohtashemi, and Halberstadt (MMH) [17] are implemented and compared with regard toaccuracy, performance and resistance to deception. In order to improve performance incertain cases, MMH is modified to distinguish the concept of “trust” from the concept of“reputation.” Additionally we examine the results of shortening the memory of MMH inorder to improve results in environments that are constantly changing.