Research On Key Technology Of Privacy Protection In Blockchain

With the rapid development of cryptocurrencies such as bitcoin,the blockchain is attracting more and more attention.The blockchain is a disruptive technology,generating a new computing paradigm and transforming from information Internet to value Internet.The application potential of blockchain is huge,and the application scope is wide,and the political,economic,cultural,military and other important fields of various countries have released the block chain research plan successively.The strong security features and strong privacy protection feature of blockchain are important aspects to promote the development of blockchain,but the security and privacy features of blockchain are not perfect.With the popularity of blockchain,more and more people pay attention to blockchain,and more and more security and privacy leakage events of blockchain occur.Like any other emerging technology,the privacy protection and security of blockchain is the decisive factor determining the height and width of blockchain development.This paper studies the privacy protection and security problems of blockchain based on aggregate signature and ring signature technology and heterogeneous technology,and puts forward solutions to related problems.1.Around the privacy problem of blockchain,using the method of aggregate signature,on the basis of CryptoNote model,for the privacy problem of trading addresses and transaction amount in blockchain,put forward a privacy protection scheme on blockchain based on aggregate signature.Firstly,based on CryptoNote model,aimed at the single transactions consisted of multiple inputs and multiple outputs,make aggregated signature to multiple output addresses,achieving the purpose of protecting transaction addresses.And then using the similar way of thinking,make aggregated signature to the transaction amount of the transaction contains multiple input addresses and multiple outputs addresses,achieving the purpose of protecting transaction amount.This solution completes privacy protection of blockchain,while reducing the storage requirements of trading that each block can save more transaction,assuming a transaction contains n different output addresses,under this scheme,each block can store the number of transactions is n times as before.This scheme resolves the problem of blockchain expansion to some extent.2.Aimed at privacy protection of transaction addresses in blockchain,combining aggregate signature and ring signature,this paper proposes a new signature scheme.Based signature algorithm of this scheme is ring signature,in addition to the signer,others only know the signer from a collection of individuals and cannot confirm signer.On the basis of the ring signature scheme,the aggregate signature scheme is combined.When a transaction involving multiple input addresses and multiple output addresses,regardless of the number of output addresses,the final signature length is fixed.This scheme protects the privacy of the transaction addresses in the blockchain,while providing the idea for the expansion solution of the block chain.3.In view of the security problems of the blockchain,combined with the privacy leakage risks and security threats that the blockchain is currently facing,and considering the privacy risks and security threats that the blockchain may face in the future.Based on the thought of mimicry defense,this paper proposed mimicry blockchain scheme based on the mimicry smart contract,the mimicry signature algorithm and the mimicry consensus mechanism.The scheme can effectively solve some of the security threats and privacy risks in the current blockchain,and can have a certain effect on the future attacks of quantum computers.From the perspective of security analysis,the security of the proposed block chain is far better than the typical blockchain architecture.