@article{BusomPetrlicSebeetal.2018,
  author    = {Nuria Busom and Ronald Petrlic and Francesc Sebe and Christoph Sorge and Magda Valls},
  title     = {A privacy-preserving reputation system with user rewards},
  series   = {Journal of Network and Computer Applications},
  volume    = {80},
  publisher = {Academic Pr.},
  address   = {London},
  pages     = {58 -- 66},
  year      = {2018},
  abstract  = {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.},
  language  = {en}
}