Welcome to the resource topic for 2022/661
Title:
Protego: A Credential Scheme for Permissioned Blockchains (Extended Version)
Authors: Aisling Connolly, Jerome Deschamps, Pascal Lafourcade, and Octavio Perez Kempner
Abstract:Recent works to improve privacy and auditability in permissioned blockchains like Hyperledger Fabric rely on Idemix, the only anonymous credential system that has been integrated to date. The current Idemix implementation in Hyperledger Fabric (v2.4) only supports a fixed set of attributes, it does not support revocation features, nor does it support anonymous endorsement of transactions (in Fabric, transactions need to be approved by a subset of peers before consensus). A prototype Idemix extension by Bogatov et al. (CANS, 2021) was proposed to include revocation, auditability, and to gain privacy for users. We explore how to gain efficiency, functionality, and further privacy departing from recent works on anonymous credentials based on Structure-Preserving Signatures on Equivalence Classes. As a result, we propose Protego and Protego Duo, two alternatives for Idemix and its recent extensions. We discuss how they can be used in the permissioned blockchain setting and integrated to Hyperledger Fabric. We also provide a prototype implementation and benchmarks showing that both alternatives are twice as fast as state-of-the-art-approaches.
ePrint: https://eprint.iacr.org/2022/661
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