Research On Privacy Protection Technology Of Blockchai

In recent years,blockchain technology has developed rapidly.It has been widely used in finance,medical,retail and other fields,and has promoted a series of innovative mobile services.Digital currency using blockchain technology allows users to easily establish transactions.In the system,all transactions are recorded openly and transparently in the blockchain,and users do not need to worry about the risk of data tampering.This brings transparency and trustworthiness to users,but at the same time,it also brings privacy risks.Users may therefore leak their assets or capital flows.Therefore,the establishment of privacy protection means for blockchain technology has become a current research hotspot in this field.In this regard,this paper starts from the two aspects of blockchain address anonymity and transaction information hiding.The main research results are as follows:First,for the privacy protection of address anonymity,this paper proposes an address shuffling mechanism for P2 P anonymous grouping.This mechanism uses public keys issued anonymously to group participants so that the last user in each group is randomly generated.This can improve the randomness of the mix.Then in the group,the output addresses of the participants are shuffled based on the decrypted hybrid network.This ensures the internal privacy of the coin mixing process and improves its efficiency.Secondly,for the multi-party mixed transaction with transaction information hidden,this paper adopts a range proof based on the vector inner product commitment as the basis.Then,without exposing all the assets of users,a zero-knowledge proof scheme was designed to prove the confidential assets of multiple users in batches.The improved scheme can be applied to the verification of aggregated confidential transactions involving multiple parties,and will bring less time and space overhead to the verification of confidential transactions in the blockchain system.Finally,based on the two blockchain privacy protection technologies proposed in this paper,a new multi-party zero-knowledge proof mixed currency protocol is proposed.The agreement incorporates confidential transactions based on Pedersen’s commitments into the coin mixing agreement.Then combine the address obfuscation mechanism with multi-party security summation.This can achieve transaction equality verification and scope verification for confidential mixed coin transactions.Compared with the existing blockchain privacy protection technology,this agreement allows a group of users who do not trust each other to create a mixed confidential transaction without revealing the relationship or assets between their input and output addresses.