Cryptology ePrint Archive: Report 2019/925

Traceable and linkable ring signatures, traceable range proofs and applications on regulatable privacy-preserving blockchains

Wulu Li and Lei Chen and Xin Lai and Xiao Zhang and Jiajun Xin

Abstract: Privacy protection has been extensively studied in the current blockchain research field. As representations, Monero and Zerocash have realized completely anonymous and amount-hiding transactions. However, nonregulation can lead to abuse of privacy, which brings about serious risks of breaking laws and committing crimes. Therefore, it is crucial to study the privacy-preserving blockchain systems with regulatory functions. In this paper, we discuss the regulatory model (regulator behavior, user behavior) on the privacy-preserving blockchains from application scenarios and finally select unconditional regulation, static regulation, and self-participation of users as the core principles, which is currently the closest approach to the "decentralization" of regulatable privacy-preserving blockchains. On the basis of the established regulatory model, we first propose a traceable and linkable ring signature scheme (TLRS) by use of classic ring signatures, one-time signatures and zero-knowledge proofs, which realizes the unforgeability, anonymity, linkability, nonslanderability and traceability of users' identities. Moreover, we first propose traceable Borromean range proof (TBoRP) and traceable Bulletproofs range proof (TBuRP) by use of Fiat-Shamir transform and DH assumptions, which realize the completeness, soundness, zero-knowledge and traceability of the transaction amounts. We also apply the newly designed schemes and other zero-knowledge proof protocols to achieve richer regulatory functions.

Category / Keywords: public-key cryptography / regulatable blockchain; privacy preserving; decentralization; traceable and linkable ring signature; traceable range proof; zero-knowledge proof

Date: received 14 Aug 2019

Contact author: liwulu at onething net

Available format(s): PDF | BibTeX Citation

Note: We give a construction of regulatable privacy-preserving blockchain from the newly designed schemes: traceable and linkable ring signatures (TLRS), traceable Borromean range proof (TBoRP) and traceable Bulletproofs range proof (TBuRP). If you have comments or suggestions, please contact us by e-Mail.

Version: 20190818:154358 (All versions of this report)

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