Research On Blockchain Data Privacy Protection Technology Based On Ring Signature

Blockchain,is essentially a new type of distributed data storage technology,which records sensitive information such as transaction information between all users and the identity information of the users on the chain.It is open,transparent and multi-centralized,the stored information on the chain is not modifiable.It breaks the original trust system and the two parties who do not trust each other can interact with each other directly.These advantages have attracted the attention of various industries and governments.In recent years,blockchain has been increasingly involved in a wide range of industries.Finance,supply chain,entertainment,film and television,games and other industries have begun to introduce blockchain technology to solve some pain points in the industry.With the widespread application of blockchain technology,the original anonymity of blockchain has been unable to ensure users' demand for privacy protection in different application scenarios.Therefore,it is urgent to propose relevant schemes for different application scenarios to guarantee data privacy and user identity privacy on the blockchain.This article conducts related research on the current issues of user identity and transaction data privacy in the blockchain.The main research work is as follows:1)Taking the current privacy issues in blockchain as the research object,the existing privacy issues in the blockchain are summarized into two categories: user identity privacy and transaction data privacy;then,according to the different technologies used,this paper introduces the existing privacy protection schemes in brief,and analyzes the advantages and disadvantages of each scheme,providing research directions for proposing new protection schemes with higher efficiency and stronger privacy protection ability.2)To solve the problem of user identity privacy in the block chain privacy protection scheme,a scheme to enhance user identity privacy on the block chain is proposed by combining the linkable ring signature and aggregate signature.Through the link ring signature algorithm,the transaction sender can anonymously send the transaction request and relevant transaction information in the user group,realizing the unconditional privacy of the user identity;at the same time,the hybrid node in the block chain uses the aggregation signature algorithm to aggregate n different signatures of n users received into one signature,which greatly reduces the verification time of the signature on the chain,improves the block chain performance,confuses the mapping relationship between multiple transactions,and protects the transaction privacy in the block chain;The security analysis shows that the scheme can guarantee user identity privacy under the stochastic predictive machine model and CDH difficulty.3)Aiming at the special requirements in the application scenario of electronic voting,an anonymous electronic voting scheme based on alliance chain is proposed to ensure the identity privacy of voters by using linkable ring signature.Due to the linkability of linkable ring signature,the scheme can conveniently prevent the situation of one vote and many votes.At the same time,automated vote counting is conducted through intelligent contract,which ensures the correctness of the voting results and ensures the fairness of the voting results by utilizing the non-tampering of data stored on the block chain.