Research And Implementation Of Ring Signature Privacy-preserving Scheme In Blockchain

Blockchain,as a decentralized ledger,solves the problem of third party trust,which is widely used in transactions,finance and other scenarios.However,blockchain transactions are open and transparent for nodes on the network,it is easy for malicious people to extract and analyze user privacy information,which leads to blockchain information leakage problem.Ring signature with the unconditional anonymity,which can solve identify privacy problem of the blockchain transaction parties.Currently,there are still some problems such as transaction amount exposure and high storage cost when it is applied to blockchain.Therefore,this paper analyzes and studies the ring signature privacy-preserving scheme in blockchain.This paper proposes trapdoor based commitment RingCT scheme TRCT.It utilizes the feature of one-way fast calculation of trapdoor function to reduce the storage cost,and combines zero-knowledge proof to avoid the exposure of commitment disclosure,which solves the problems of high storage cost,disclosure risk and low efficiency in the original RingCT scheme.In this paper,the security of TRCT scheme is analyzed theoretically,and the availability and effectiveness are analyzed experimentally.The experimental results show that the scheme has a significant improvement in both time and storage cost.Besides,based on the TRCT scheme,this paper puts forward the evaluation index system of RingCT privacy-preserving,and establishes the trapdoor based RingCT privacy-preserving apraisal analysis System TRAS.In TRAS system,the data generated by TRCT transaction are extracted and analyzed from four dimensions of completeness,scalibility,security and reliability to obtain the evaluation results of privacy-preserving,which reduces the evaluation threshold and the derivation steps,and enriches the evaluation dimension.In the end,the test analysis verifies the system availability and obtains the TRCT evaluation results.