Computer Science

Computer Science ›› 2023, Vol. 50 ›› Issue (6): 307-312.doi: 10.11896/jsjkx.220600069

• Computer Network • Previous Articles     Next Articles

Multi-factor Blockchain Private Key Protection Scheme Based on Secret Sharing

XIAO Jian, YANG Min   

  1. Key Laboratory of Aerospace Information Security,Trusted Computing,Ministry of Education,School of Cyber Science,Engineering,Wuhan University,Wuhan 430072,China
    School of Cyber Science and Engineering,Wuhan University,Wuhan 430072,China
  • Received:2022-06-07 Revised:2022-11-09 Online:2023-06-15 Published:2023-06-06
  • About author:XIAO Jian,born in 1999,postgraduate,is a member of China Computer Federation.His main research interests include blockchain and applied cryptography.YANG Min,born in 1975,Ph.D,asso-ciate professor,master supervisor,is a member of China Computer Federation.Her main research interests include information security and applied cryptography.
  • Supported by:
    National Natural Science Foundation of China(62172308) and National Key R & D Program of China(2021YFB2700200).

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Abstract: Aiming at the problem that the user's private key is difficult to retrieve once lost due to the lack of a recovery mechanism in the blockchain,a multi-factor blockchain private key protection scheme based on passwords,secret questions and fingerprints is proposed.The scheme does not require users to store additional information and can be implemented completely online,and adopts an anti-forgetting factor access strategy.During the registration phase,users need to provide all factor information(including password,secret question and fingerprint) and blockchain private key,and use a secret sharing scheme to assign a secret share to a group of servers.In the recovery phase,users only need to provide some factors and send recovery applications to multiple servers to obtain the information of their secret shares and reconstruct the private key of the blockchain.Experimental results and heuristic security analysis show that the computing cost of both client and server in this scheme is in milliseconds,and it can resist known attacks and provide better security by supporting multiple factors.

Key words: Multi-factor blockchain private key protection, Secret sharing, Password protected secret sharing, Fuzzy extraction

CLC Number: 

  • TP309.7
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