Cryptology ePrint Archive: Report 2020/777

Dynamic Universal Accumulator with Batch Update over Bilinear Groups

Giuseppe Vitto and Alex Biryukov

Abstract: We propose a Dynamic Universal Accumulator in the Accumulator Manager setting for bilinear groups which extends Nguyen's positive accumulator and Au et al. and Damgård and Triandopoulos non-membership proof mechanism. The new features include support for batch addition and deletion operations as well as a privacy-friendly decentralized batch witness update protocol, where the witness update information is the same for all users. Together with a non-interactive zero-knowledge protocol, these make the proposed scheme suitable as an efficient and scalable Anonymous Credential System, accessible even by low-resource users. We show security of the proposed protocol under the t-SDH assumption through a proper initialization of the accumulator and we demonstrate its practical relevance by providing and discussing an implementation realized using state-of-the-art libraries.

Category / Keywords: cryptographic protocols / accumulator, universal, dynamic, batch update, privacy-preserving KYC, anonymous credentials

Date: received 23 Jun 2020

Contact author: giuseppe vitto at uni lu, alex biryukov@uni lu

Available format(s): PDF | BibTeX Citation

Version: 20200624:075912 (All versions of this report)

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