Cryptology ePrint Archive: Report 2014/546

Anonymous and Publicly Linkable Reputation Systems

Johannes Blömer and Jakob Juhnke and Christina Kolb

Abstract: We consider reputation systems where users are allowed to rate products that they purchased previously. To obtain trustworthy reputations, they are allowed to rate these products only once. As long as they do so, the users stay anonymous. Everybody is able to detect users deviating from the rate-products-only-once policy and the anonymity of such dishonest users can be revoked by a system manager. In this paper we present formal models for such reputation systems and their security. Based on group signatures we design an efficient reputation system that meets all our requirements.

Category / Keywords: Reputation, trust, group signatures, anonymity, linkability, verifier-local revocation, traceability, strong-exculpability

Original Publication (with major differences): Financial Cryptography and Data Security 2015

Date: received 14 Jul 2014, last revised 13 Mar 2015

Contact author: juhnke at mail uni-paderborn de

Available format(s): PDF | BibTeX Citation

Note: This is the updated full version of the paper that appeared in FC'15 with the same title.

Version: 20150313:093234 (All versions of this report)

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