Research On Efficient Data Storage And Sharing Technology Based On Blockchain

The traditional centralized storage system hinders the sharing of data and is prone to single point of failure.Semi-trusted cloud storage makes the data owner lose control of the data,and third parties are likely to leak users' private data.The advent of decentralized and tamper-proof blockchains,which ensure security and transparency,offers the possibility to solve these problems,However,the storage capacity of blockchain is limited,the scalability of a single blockchain solution is poor,and the throughput is low.The data storage and sharing structure based on blockchain is not efficient in sharing.The emergence of edge computing has improved the efficiency of data sharing to a certain extent.However,a series of problems such as data integrity and authenticity,identity privacy,high latency and heavy key management under edge computing need to be solved urgently.In addition,the exponential growth of data requires us to reasonably allocate the storage space of edge nodes and cloud servers.The storage space of edge nodes is limited.The current solution cannot guarantee that each submessage in the complete data stored by edge nodes can meet the requirements of hot data.The existence of redundant data results in a waste of storage space and a low hit rate of access..In view of the above problems,this paper combines the advantages of blockchain technology and related cryptography technology to deeply study the efficient data storage and sharing technology model based on blockchain,using dual blockchain structure and cloud storage to ensure consistent data storage under the premise.To solve the problems of limited storage capacity and poor scalability of blockchain,the introduction of edge computing improves the efficiency of data sharing.In addition,in order to further improve the storage efficiency of edge nodes and ensure a high hit rate of access,a privacy protection requirement is designed.Redundant data detection and removal methods.The main work carried out includes:First,from the perspective that most existing data storage and sharing use blockchain and cloud computing,the limitations of traditional data storage and sharing are analyzed,and the advantages of using dual-blockchain structure and edge computing are drawn.The research status of efficient data storage and sharing that meets privacy protection requirements under edge computing based on blockchain is introduced.Second,design a data storage and sharing method based on dual blockchain.Cloud storage combines blockchain to solve the problem of limited storage capacity of blockchain,while greatly reducing the risk of original data leakage.Content Extraction Signature(CES)combined with dual blockchain technology realizes the separation of the private part and the shared part of the original data.The use of symmetric encryption technology combined with attribute-based encryption technology(CP-ABE)ensures the safe storage of data in the cloud,and also realizes the consistency and convenience of data update,avoiding redundant data backup.Third,design a method of data storage and sharing under edge computing based on blockchain.This architecture not only enables low-latency message response for end users,but also ensures that the data is still accurate while experimenting with anonymous authentication,considering the security of identity.Utilize a tamper-proof blockchain to achieve distributed storage of key shares,avoiding single point of failure issues and burdensome key management.CES technology ensures that cryptographic shares stored separately in different blocks of the blockchain still have data integrity.In addition,this scheme also uses homomorphic encryption to prevent leakage of user privacy during data processing.Fourth,design a method for redundant data detection and deletion under edge computing based on blockchain.By scanning the ciphertext,it is judged whether each sub-message of the data in the edge node meets the requirements of hot data.It has the same effect as zeroknowledge proofs and does not leak user privacy.By deleting redundant data to ensure that as much hotspot data as possible can be stored in edge nodes to ensure response timeliness and hit rate.For redundant sub-data that does not meet the requirements of hot data,the extraction signature of the remaining message is generated to realize data dynamic integrity verification.Through the above work,this paper designs an efficient data storage and sharing scheme based on blockchain.The dual-blockchain structure improves the efficiency of data sharing and realizes personalized data sharing.The introduction of edge computing ensures timely data response.At the same time,this paper solves the problem of user identity information leakage under edge computing;by detecting and deleting redundant data in edge nodes that meet the requirements of privacy protection,the timeliness of response and high hit rate are guaranteed;...