Blockchain Security Protection Method Based On Cyber Mimic Defense And Ring Signature

With the maturity and development of blockchain technology,the application of blockchain technology is not limited to digital cryptocurrency,but has become more and more in electricity,transportation,logistics,Internet of Things,finance,supply chain,medical data and more related applications.Ethereum and Hyperledger based on blockchain technology have gradually matured and deepened,which has promoted the diversified development of blockchain security requirements.As the earliest project to break away from the limitation of digital encrypted currency system,Hyperledger's Fabric Project provides a good example for the application of block chain technology in government,finance,enterprise and other fields.However,with the diversification of blockchain-related applications,there have been more and more transaction security issues and privacy breaches.At the same time,in terms of practicality,the blockchain was originally proposed for the decentralized system.The Fabric Project's application in centralized blockchain systems has faced accountability and security issues.Based on the ring signature and sanitizable signature and the mimic defense idea,this paper studies the security issues and accountability of blockchains,and proposes solutions to related problems.1.Using traditional digital signature,short signature and verifiable ring signature,focus on the problem that the information on the alliance blockchain can not be modified after being signed,it will face the danger of privacy leakage when the audit and disclosure is required.To solve this problem,a new sanitizable signature scheme based on ring signature and short signature is constructed,this new scheme uses the advantage of verifiable ring signature in computing performance to improve the performance of the sanitizable signature and use the short signature reaches strong accountability.This scheme achieves that the signer and sanitizer can provide relevant proofs which cannot be tampered without exposing their private key when the source of the message needs to be confirmed.This new scheme allows the signer and sanitizer to be self-certified while the other transaction information on the blockchain being protected.This scheme meets the full secure requirements and highly auditable,and has certain performance advantages over other sanitizable signature schemes.2.As the Hyperledger project has showed the privacy leakage risk and security threats,combined with the privacy leakage problems and security vulnerabilities existing in the current blockchain projects,and taking into account the possible security of the blockchain in the future.Based on mimic defense idea,we proposed a Fabric project mimetic blockchain scheme with the mimic chaincode and the mimetic endorsement system chaincode as the core.This solution can effectively solve the security threats of the Fabric project due to features such as centralized architecture and alliance blockchain,and can protect against quantum computing attacks that may occur to some extent.From the perspective of security analysis,the mimetic blockchain scheme has better security than Fabric's existing blockchain architecture.For a wider range of blockchain applications,the mimetic blockchain approach is also universal.