Research On Key Technologies Of Electronic Storage And Forensics Based On Lightweight Blockchain

Under the current social development,the network connects every corner of the world,and electronic data fills every inch of society.Cybercrime cases emerge one after another,and cases involving electronic evidence are increasing day by day.However,due to easy tampering and forgery,the authenticity,integrity and acceptability of electronic evidence are often challenged.How to store and obtain electronic evidence effectively and safely has become the key to solve the problem.With the development of blockchain technology,electronic evidence storage and forensics technology based on blockchain has been put forward,which has the characteristics of traceability and non-tampering,and can meet the authenticity and integrity requirements of electronic evidence storage and forensics,and is an effective solution to the above problems.In view of this,the paper further studies the electronic evidence storage and forensics technology based on blockchain,and the contents are as follows:(1)The blockchain technology is applied to the process of electronic evidence storage and forensics,and the system framework of electronic evidence storage and forensics based on blockchain is designed according to the storage scheme and access control model proposed in this paper,and realize the electronic evidence storage and forensics system based on lightweight blockchain.(2)A lightweight blockchain packet storage architecture based on erasure codes is proposed.In the blockchain network,all nodes need to store complete copies of the blockchain,which may cause excessive storage pressure on the nodes.A lightweight blockchain grouping storage architecture based on erasure codes is proposed,in which files are stored under the chain and file information and addresses are stored on the chain to reduce the block size.At the same time,the nodes in the blockchain network are grouped,and the block files are encoded by Reed-Solomon code,which is evenly distributed in the group,so that the storage space required by the nodes is greatly reduced,and the block files can be recovered as needed.(3)The smart contract technology is applied in the stages of evidence collection,evidence preservation,evidence analysis and evidence verification of electronic evidence storage and forensics to enhance the automation of the electronic evidence storage and forensics process,so that any operation of electronic evidence in the system is recorded,ensuring that the whole process of electronic evidence storage and forensics can be traced and the electronic evidence cannot be tampered with.(4)An electronic evidence access control model based on CP-ABE is proposed.This model enables evidence providers to encrypt electronic evidence according to their own needs,control the sharing scope of electronic evidence and prevent illegal access.It realizes the sharing of electronic evidence and meets the privacy and security requirements of electronic evidence.