区块链P2P网络及安全研究OA北大核心CSTPCD

Blockchain is proposed as a technology integrating various technological innovations such as distributed led-ger,cryptography,consensus algorithm and P2P(peer-to-peer)network.It realizes decentralization,traceability and tam-per resistance in an open environment with mutual distrust nodes.Blockchain has solved the problems of trust establish-ment,security management and privacy protection that have been plaguing the traditional centralized service architecture,and has been drawing broad attention from various fields of society.Among them,P2P network realizes the final consis-tency of distributed ledger through consensus algorithm,and utilizes various protocols to coordinate the services provided by each node.Its functionalities are continuously enriched and improved with each technological iteration of blockchain,thus forming a relatively independent blockchain P2P network,which has become the focus of blockchain research.Firstly,this paper systematically introduces the characteristics and key technologies of P2P network,especially the overlay net-work,resource query and jitter of P2P network.Secondly,the typical blockchain application scenarios are used to analyze the working mechanism and operation characteristics of blockchain P2P network from the perspective of architecture and protocol implementation.Then,the paper introduces the security risks of blockchain P2P network,and discusses the imple-mentation process and prevention methods of typical attacks.Finally,the summary is given by exploring the security chal-lenges and key technical responses in blockchain networks.