Computer Science

Computer Science ›› 2021, Vol. 48 ›› Issue (11): 72-78.doi: 10.11896/jsjkx.210600242

• Blockchain Technology • Previous Articles     Next Articles

Traceable Mixing Scheme for Bitcoin

YU Qi-long, LU Ning, SHI Wen-bo   

  1. School of Computer and Communication Engineering,Northeastern University at Qinhuangdao,Qinhuangdao,Hebei 066004,China
  • Received:2021-06-29 Revised:2021-07-14 Online:2021-11-15 Published:2021-11-10
  • About author:YU Qi-long,born in 1988,postgraduate,is a member of China Computer Federation.His main research interests include blockchain and privacy protection .
    SHI Wen-bo,born in 1980,Ph.D,professor,Ph.D supervisor,is a member of China Computer Federation.His main research interests include cryptography and blockchain.
  • Supported by:
    National Natural Science Foundation of China(62072093,U1708262) and Natural Science Foundation of Hebei Province,China(F2020501013).

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Abstract: Mixing is an important way for privacy protection among digital currency such as Bitcoin.However,on the one hand,Bitcoin mixing protects user privacy,on the other hand,it facilitates the transfer of assets for illegal activities such as ransomware and Bitcoin theft.In this paper,we propose a traceable scheme for Bitcoin mixing.The scheme aims to protect the privacy of legi-timate users and can trace the illegal assets.The system is regulated by trusted third party,user anonymity and traceability based on the group signature which is constructed by bilinear groups and strong Diffie-Hellman assumption.When there is a need for tracing,the regulator can determine the signed user through the system private key,so as to determine the illegal asset transfer path.Security analysis shows that the scheme can trace the illegal asset transfer without modifying the current Bitcoin system,meanwhile,the solution provide privacy protection and asset safety for legitimate users.Furthermore,the scheme provides a refe-rence direction for the research on digital currency privacy protection.

Key words: Bitcoin mixing, Blockchain, Group signature, Privacy protection, Traceable

CLC Number: 

  • TP309
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