| Summary: | To address the security of the recovery of lost private keys on the blockchain,this paper proposes a distributed management scheme for private keys based on threshold secret sharing.The scheme combines the user’s private key with the secret password as a secret and uses the threshold key mechanism to divide the secret into several secret fragments,which are assigned to honest nodes for custody in the network by using the practical Byzantine fault tolerant algorithm.When the user’s private key is lost,the private key can be recovered by collecting secret fragments more than the threshold and combining them with the secret password.Analysis results show that this scheme is anonymous and resistant to collusion attacks and single node failure.It can implement recovery of the user’s lost private key while the dynamic management and secure storage of the private key is ensured.
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