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

Suggested 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.

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