A privacy-preserving reputation system with user rewards
Issue date
2017Suggested citation
Busom Figueres, Núria;
Petrlic, R.;
Sebé Feixas, Francesc;
Sorge, C.;
Valls Marsal, Magda;
.
(2017)
.
A privacy-preserving reputation system with user rewards.
Journal of Network and Computer Applications, 2017, vol. 80, p. 58–66.
https://doi.org/10.1016/j.jnca.2016.12.023.
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Show full item recordAbstract
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.