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In current peer-to-peer systems users interact with unknown services and users for the purpose of online transactions such as file sharing and trading of commodities. Peer-to-Peer reputation systems allow users to assess the trustworthiness of unknown entities based on subjective feedback from the other peers. However, this cannot constitute sufficient proof for many transactions like service composition, negotiations and coalition formation in which users require more solid proof of the quality of unknown services. Ratings certified by trusted third parties in the form of a security token are objective and reliable and, hence, allow building trust between peers.
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