Groupchain: A Blockchain Model with Privacy-preservation and Supervision

Blockchain technology is a type of decentralized technology that enables secure and trusted operations to be performed in untrusted environments. Privacy preservation and supervision are contradictions in decentralized environments. First, to reach a consensus in a decentralized environment, each node of the blockchain holds all of the ledger data, but this brings a huge risk of privacy leakage; alternately, the ledger data is encrypted with a hash to ensure security, making it difficult for regulatory authorities to regulate the blockchain through legal methods. This paper proposes a blockchain model based on a Group signature idea with the permission blockchain as the underlying architecture, aiming to neutralize the contradiction between privacy preservation and supervision in the blockchain technology. This paper designs three schemes entitled GroupSig, GroupCT, and Semi-Stealthaddress to achieve the goals we set. Finally, we analyze the security of Groupchain and evaluate the efficiency of the corresponding scheme.

[1]  Abdellah Ait Ouahman,et al.  Towards a Novel Privacy-Preserving Access Control Model Based on Blockchain Technology in IoT , 2017 .

[2]  Yong Yu,et al.  An Efficient Linkable Group Signature for Payer Tracing in Anonymous Cryptocurrencies , 2019, Future Gener. Comput. Syst..

[3]  Dawn Xiaodong Song,et al.  Practical forward secure group signature schemes , 2001, CCS '01.

[4]  K. Yeung.  Regulation by Blockchain: The Emerging Battle for Supremacy between the Code of Law and Code as Law , 2019, The Modern Law Review.

[5]  Elaine Shi,et al.  Hawk: The Blockchain Model of Cryptography and Privacy-Preserving Smart Contracts , 2016, 2016 IEEE Symposium on Security and Privacy (SP).

[6]  Zhang Xing-lan.  Efficient group signature scheme , 2009 .

[7]  Marc Joye,et al.  A Practical and Provably Secure Coalition-Resistant Group Signature Scheme , 2000, CRYPTO.

[8]  Vitalik Buterin.  A NEXT GENERATION SMART CONTRACT & DECENTRALIZED APPLICATION PLATFORM , 2015 .

[9]  David Chaum,et al.  Group Signatures , 1991, EUROCRYPT.

[10]  Satoshi Nakamoto.  Bitcoin : A Peer-to-Peer Electronic Cash System , 2009 .

[11]  Xin Xu,et al.  A Secure and Efficient Authentication and Key Agreement Scheme Based on ECC for Telecare Medicine Information Systems , 2013, Journal of Medical Systems.

[12]  Christian Cachin,et al.  Architecture of the Hyperledger Blockchain Fabric , 2016 .

[13]  L. Cong,et al.  Auditing and Blockchains: Pricing, Misstatements, and Regulation , 2018 .

[14]  David Chaum,et al.  Untraceable electronic mail, return addresses, and digital pseudonyms , 1981, CACM.

[15]  Matthew Green,et al.  Zerocoin: Anonymous Distributed E-Cash from Bitcoin , 2013, 2013 IEEE Symposium on Security and Privacy.

[16]  Eli Ben-Sasson,et al.  Zerocash: Decentralized Anonymous Payments from Bitcoin , 2014, 2014 IEEE Symposium on Security and Privacy.

[17]  Jianfeng Wang,et al.  Blockchain-based multiple groups data sharing with anonymity and traceability , 2019, Science China Information Sciences.

[18]  Karen Lockett-Yeung,et al.  Regulation by blockchain: the emerging battle for supremacy between the code of law and code as law , 2018 .

[19]  Tsz Hon Yuen,et al.  RingCT 2.0: A Compact Accumulator-Based (Linkable Ring Signature) Protocol for Blockchain Cryptocurrency Monero , 2017, ESORICS.

[20]  Michele Finck,et al.  Blockchain Regulation and Governance in Europe , 2018 .

[21]  Sean Cao,et al.  Financial Reporting and Blockchains: Audit Pricing, Misstatements, and Regulation , 2019 .