Research On Privacy Protection Technology Based On Blockchain

Block chain technology as a widely expected,it is decentralization,to trust,open and transparent,traceability,etc,in the aspects such as finance,logistics,supply chain,and the commonweal philanthropy has the congenital advantage,can effectively solve some problems inherent in these fields,such as the total transfer process trival,capital flow,logistics supply regulation in the inconvenience is not transparent and so on.Using traditional methods to solve these problems requires a lot of manpower and resources,while using blockchain technology can greatly save costs.In recent years,various industries are actively exploring the use of blockchain technology to solve the difficulties and pains in their own industry,while promoting the development of blockchain technology itself.However,in the process of blockchain application,it also exposed some problems of its own.Because of its characteristics of openness and transparency,the data on the blockchain is open to all users.Through analysis,attackers can know the real identity of users and some behaviors of users on the blockchain,which damages the privacy of users.So blockchain privacy protection research is crucial.There are two main research approaches to the protection of blockchain privacy.The first is the pursuit of complete anonymity and privacy based on digital currency.The goal is to enable no one to analyze the user's identity and behavior on the blockchain through the data on the blockchain,such as the privacy protection in bitcoin and Monroe COINS.The second is to protect the privacy of users under the condition of supervision.Attackers cannot obtain the identity of users through analysis.The supervisor of the blockchain system can check the legitimacy of the data on the chain.The research on privacy protection of digital currency mainly focuses on the privacy protection of bitcoin.The privacy protection method of bitcoin is mainly mixed currency technology,which can be divided into centralized mixed currency and decentralized mixed currency.Decentralized mixed currency can avoid cheating in the mixed currency center,but generally requires the same amount of mixed currency.Currently,there are few researches on the privacy protection of the supervised blockchain.This paper studies the two directions of blockchain privacy protection respectively.Specific research contents are as follows:1.The structure of blockchain is introduced,and the deficiency of privacy protection in blockchain is analyzed.This paper analyzes the research status of blockchain privacy protection and describes the basic structure of blockchain system.2.This paper proposes a decentralized mixing method that can customize the amount of mixed currency.The mixed currency users entrust different quantities of bitcoin to the mixed currency server group,which mixes the output address of the users,and then transfers the bitcoin of the mixed currency users to the output address of the mixed currency users to achieve the purpose of confusing bitcoin.3.This paper analyzes that the application of block chain in real life should take into account the supervision issues.In this paper,the single-kgc group signature algorithm is changed to the multi-kgc group signature algorithm,and a privacy protection method based on the group signature is proposed,so that the privacy of users can be protected and monitored at the same time.The correctness and safety of the scheme are proved.The efficiency of group signature is analyzed.The innovations of this paper include:1.A decentralized mixed currency scheme of digital currency with customizable amount is proposed.The scheme can achieve the custom amount of mixed currency,improve the convenience of mixed currency;By reducing the number of managed addresses in mixed currency,the efficiency of mixed currency is improved.2.Proposed a privacy protection scheme for supervised blockchain based on group signature.The group signature is used to guarantee the anonymity of the users.Meanwhile,the group signature can be opened when necessary to discover the identity of the users and realize the supervision.