Research On Blockchain Security Technology Based On Auction Mechanism

Auction originated in Babylon in 500 BC,which is a traditional and vibrant industry.With the popularity of the Internet,the traditional offline auction is gradually replaced by electronic auction.With the popularity of the Internet,the traditional offline auction is gradually replaced by electronic auction.Although electronic auction has the characteristics of breaking through space,time and physical restrictions,there are also malicious auction behaviors such as malicious third-party platform,denial or collusion.Blockchain has the characteristics of decentralization,anonymity and traceability,which can be used to solve the problems of third party,collusion and denial in electronic auction and improve electronic auction.However,the existing electronic auction scheme based on blockchain can only meet one or several aspects of the requirements of anonymity,verifiability and decentralization,and it is difficult to take care of both.At the same time,most auction methods based on blockchain pay attention to and study the protection in the auction,but lack a protection for the works before the auction and a protection for the transaction security after the auction.In view of this,this thesis combines image feature extraction technology,blockchain technology and undirected double-loop network topology to study the comprehensive security of blockchain-based electronic auction in the early,middle and late stages.The main innovations are as follows:(1)Aiming at the pre-stage of electronic auction based on blockchain,the conventional electronic auction can’t guarantee whether the auction works are infringed or not.This study introduces the image feature extraction technology in artificial intelligence,and combines blockchain and linkable ring signature to construct an electronic auction method for minority paintings.This method can detect infringement and plagiarism before the auction,and prevent double quotation while protecting the privacy of bidders in the auction.(2)Aiming at the auction stage of electronic auction based on blockchain,in order to ensure the correctness,confidentiality,fairness,non-repudiation and public verifiability of the auction process,this study constructs ASVChain model,an anonymous verifiable sealed quotation auction model based on blockchain.This model combines ring signature technology and homomorphic encryption technology to provide safe and verifiable steps while ensuring that each bidder’s personal information is not leaked,preventing illegal tampering and resisting collusion,thus ensuring the auction environment based on blockchain.The experimental results show that compared with the existing technologies at home and abroad,ASVChain has faster processing time and higher efficiency for auction.(3)Aiming at the transaction stage of electronic auction based on blockchain after the auction is completed,in order to solve the problems of inefficiency and vulnerability in the transaction stage after the electronic auction is completed,in the blockchain network environment,a blockchain bottom network with undirected double-ring network as the network topology is proposed.The undirected double-loop network not only provides efficient transactions,but also provides efficient and safe transactions when facing more malicious nodes in the blockchain network.The experimental results show that the proposed method improves the transaction throughput compared with the traditional ring network topology and bitcoin network topology,and is more efficient than the traditional blockchain network topology in the face of Byzantine attacks and 51% attacks.This thesis studies how to ensure the safety of the whole process of electronic auction based on blockchain.A method of re-auctioning before the auction using image feature comparison.Using ASVChain model to protect bidding and encryption privacy in auction.Use a safe and efficient blockchain network for trading after the auction.