Cryptology ePrint Archive: Report 2020/311

A Blockchain Traceable Scheme with Oversight Function

Tianjun Ma and Haixia Xu and Peili Li

Abstract: Many blockchain researches focus on the privacy protection. However, criminals can leverage strong privacy protection of the blockchain to do illegal crimes (such as ransomware) without being punished. These crimes have caused huge losses to society and users. Implementing identity tracing is an important step in dealing with issues arising from privacy protection. In this paper, we propose a blockchain traceable scheme with oversight function (BTSOF). The design of BTSOF builds on SkyEye (Tianjun Ma et al., Cryptology ePrint Archive 2020). In BTSOF, the regulator must obtain the consent of the committee to enable tracing. Moreover, we construct a non-interactive verifiable multi-secret sharing scheme (VMSS scheme) and leverage the VMSS scheme to design a distributed multi-key generation (DMKG) protocol for the Cramer-Shoup public key encryption scheme. The DMKG protocol is used in the design of BTSOF. We provide the security definition and security proof of the VMSS scheme and DMKG protocol.

Category / Keywords: applications / blockchain, traceable scheme, oversight function, verifiable multi-secret sharing scheme, distributed multi-key generation protocol

Date: received 12 Mar 2020, last revised 12 Jul 2020

Contact author: matianjun at iie ac cn

Available format(s): PDF | BibTeX Citation

Version: 20200712:085344 (All versions of this report)

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