Abstract
A cheating-free (t, n) threshold secret sharing scheme using Blockchain is presented, where Shamir's technique is followed and the Blockchain vulnerabilities due to PoW/PoS (Proof-of-Work/Stake) consensus, are removed. We address the shares’ cheating issues and design a Blockchain based SS scheme, in which the participants’ shares are recorded secretly in a block and the dealer's identity along with other parameters are made visible through the genesis block. Our scheme uses a short-length Blockchain comprising 2 blocks per secret negotiation session. The main objectives are to improve Shamir's secret sharing scheme with Blockchain such that the cheating activities from dealer and/or participants become infeasible, and to enhance Blockchain technology with a consensus mechanism using Blockchain based SS scheme such that insecurity of PoW/PoS consensus are avoidable. The security and performance analysis of the scheme are provided. Although Blockchain increases some overheads, it makes a complete cheating-free SS scheme.
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