Research On Privacy Protection Technology Of Electronic Bidding Based On Blockchain

Compared with the traditional bidding methods,E-bidding has the advantages of wide range,high efficiency and low consumption.It is the inevitable trend of the development of the bidding industry in the future.However,there are still many deficiencies in this technology,among which privacy disclosure and difficult supervision have become the most urgent problems to be solved.As a distributed storage technology,blockchain has been gradually applied to various fields such as finance,medical treatment,supply chain and so on,and solved many industry pain points due to its characteristics of decentralization,openness and transparency,transaction records that can not be tampered with and traceable.Therefore,from the perspective of blockchain,combined with privacy protection technology,this paper studies the privacy protection requirements and related business requirements under the scenario of electronic bidding.Firstly,aiming at the possible directional attacks and regulatory requirements in Ebidding,this paper designs a traceable anonymous authentication protocol integrating Idemix encryption protocol and group signature technology.The protocol provides a flexible authentication strategy for users by hiding the attributes of certificates,and protects the identity privacy of users.At the same time,group signature technology is used to realize the traceability of user identity,which not only achieves the protection of identity privacy,but also meets the regulatory needs of bidding scenarios.Secondly,according to the demand of sending bids regularly in the electronic bidding scenario,an intelligent contract based on time control encryption technology is designed.The contract decomposes and re encrypts the tender ciphertext,so that the holders of ciphertext fragments and attackers cannot crack the effective plaintext information,and ensures the privacy of the transaction.At the same time,instead of the intermediary role of the traditional time server,the blockchain node regularly reorganizes and links the received ciphertext fragments,realizing the regular sending function with privacy protection.Thirdly,combined with the two privacy protection technologies proposed in this paper,an electronic bidding privacy protection scheme based on hyperledger fabric is designed and implemented.At the same time,this paper designs a ciphertext reorganization consensus algorithm based on raft mechanism to solve the reorganization problem after ciphertext decomposition.Through the transformation of the authentication process and transaction process in fabric,the scheme fits the application scenario of electronic bidding.Finally,the function realization and efficiency analysis of the above electronic bidding privacy protection scheme are carried out.The experimental results show that the scheme meets the high standard protection of identity privacy and transaction privacy in the E-bidding scenario on the premise of ensuring reasonable computing overhead,and can track and review the real identity of illegal users when there is regulatory demand,which has certain application value and research significance.