A privacy-preserving reputation system with user rewards

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• 作者：N. Busom^a ; ^{nuria@matematica.udl.cat} ; R. Petrlic^b ; ^{ronald.petrlic@uni-saarland.de} ; F. Seb&eacute ; ^a ; ^{fsebe@matematica.udl.cat} ; C. Sorge^b ; ^{christoph.sorge@uni-saarland.de} ; M. Valls^a ; ^{magda@matematica.udl.cat}
• 关键词：Reputation system ; Reputation management ; Anonymity ; Privacy
• 刊名：Journal of Network and Computer Applications
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：80
• 期：Complete
• 页码：58-66
• 全文大小：879 K
• 卷排序：80

文摘

Reputation systems are useful to assess the trustworthiness of potential transaction partners, but also a potential threat to privacy since rating profiles reveal users’ preferences. Anonymous reputation systems resolve this issue, but make it difficult to assess the trustworthiness of a rating. We introduce a privacy-preserving reputation system that enables anonymous ratings while making sure that only authorized users can issue ratings. In addition, ratings can be endorsed by other users. A user who has received a pre-defined number of endorsements can prove this fact, and be rewarded e.g. by receiving a “Premium member” status. The system is based on advanced cryptographic primitives such as Chaum-Pedersen blind signatures, verifiable secret sharing and oblivious transfer.