A privacy-preserving reputation system with user rewards

Busom Figueres, Núria; Petrlic, R.; Sebé Feixas, Francesc; Sorge, C.; Valls Marsal, Magda

doi:https://doi.org/10.1016/j.jnca.2016.12.023

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Issue date

2017

Author

Busom Figueres, Núria

Petrlic, R.

Sebé Feixas, Francesc

Sorge, C.

Valls Marsal, Magda

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.

URI

http://hdl.handle.net/10459.1/59057

DOI

https://doi.org/10.1016/j.jnca.2016.12.023

Is part of

Journal of Network and Computer Applications, 2017, vol. 80, p. 58–66