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Through the continued progress and advances of networking technology and alsothrough efforts like Industry 4.0, SmartGrid, SmartCities, systems, that havebeen self-sustaining for the most part are now forming networked Cyber-physicalSystems (CPS). Networking does not only have undoubtely benefits but alsoincrease the often overlooked attack surface of these systems. A basic problemin information technology systems is building and sustaining trust. This worklooks at the usage of reputation systems in the field of CPS and whether theycould be used to assert the trustworthyness of communication partners. This isdone in context of a research project inHMotion of the University of appliedSciences Munich, which is in the field of Intelligent Transportation Systems(ITS). A risk based analysis is performed for this project. Based on solicitedthreats mitigations are proposed. A possible solution might be the usage of areputation system, which is designed and a prototype implementation for asimulation ist done. The concept of a meta reputation system, which combinesdifferent reputation systems and verification systems can achieve promisingresults in a simple simulation. In a concluding discussion criticism andpossible improvements are given.

Entwicklung eines Reputationssystems f\"ur cyber-physikalische Systeme am Beispiel des inHMotion Forschungsprojektes