A Secure Reputation System Based SMC

Reputation systems are designed for reducing the risk entailed in interactions among total strangers in electronic marketplaces. Such systems can be used to collect and aggregate feedback on the past behavior of participants in electronic transactions, so as to derive reputation scores assumed to predict likely future behavior.The security of reputation system is vital for the system to run correctly, if reputation system is not secure, it may not be able to produce a correct result, and consequently affects the process of decision making. In this paper, a secure reputation system based on secure multiparty computation is proposed. Each of feedback provider generates an anonymous identity using smart card, and provides a rating about feedback target by a secure multiparty computation to a querying user. The system contains the following desirable features: privacy-preserving of feedback provider, tamper-preventing of feedback, masquerade-proofing of identity, shilling attack-preventing.