Research On Privacy Protection Of Blockchain Transactions Based On Ring Signatures

Blockchain is a distributed ledger technology with non-tamperable,untrusted nodes that can reach consensus and share data,but at the same time based on these characteristics,blockchain technology has also exposed many data privacy issues,which makes the development and application of blockchain is restricted in many businesses and fields.With the constant attention to blockchain technology,how to protect the privacy of data on the blockchain is a hot issue of research.In solving the problem of the collaborative work of the blockchain among untrusted groups,ring signatures have the natural advantage of protecting the account information of the participating participants.In actual blockchain applications,the signature size of ring signatures is associated with transaction fees,but the existing privacy protection schemes based on ring signatures need to be improved in terms of signature size,privacy,and verification efficiency.In response to the above problems,this paper first constructs a new and efficient ring signature scheme.It sets up a set of public keys for identity certification that do not require a third-party trusted mechanism as the base group public key for membership certification in the ring signature.A privacy protection scheme for ring signature blockchain transactions without a trusted mechanism.Secondly,for the optimized ring signature scheme,this paper uses the vector-based Pedersen promised Bulletproof zero-knowledge proof to hide the transaction information.In combination with the inner product demonstration protocol,the size of the signature is reduced,and the speed of transaction signature and verification is improved.Finally,in order to reduce the level of anonymity due to the fact that the real signers must be located in the same column in the environmental protection confidential transaction,this article introduces a column index to break the distribution of real signers,thereby improving the anonymity of the scheme.By performing different numbers of inputs in the same environment,this paper compares the ring signature size and signature verification time of the original scheme with the optimized scheme,and verifies the usability and efficiency of the optimized scheme.The experimental results show that the signature scheme of this scheme has higher efficiency and smaller storage space,and this scheme does not require a trusted institution,and is more suitable for public chains.