Research And Development Of Digital Forensics System Based On Distributed Ledger

In the field of justice,when individual or collective interests are violated,a safe method of evidence storage is needed to assist in the judgment of the case.This process is called evidence storage.In order to improve the efficiency of handling civil disputes and other issues,the traditional paper-based certificate deposit method is gradually replaced by the electronic certificate deposit method.At the same time,in order to ensure the credibility of electronic data in the judicial process,the digital forensics process stipulates the code of conduct for the collection,storage,and review of electronic data.This process determines the validity and reliability of electronic data in the final court certification stage.The traditional certificate storage system uses a centralized way to store these electronic data.In this mode,the certificate storage agency needs to spend a lot of energy and time to maintain the safe operation of the system.In addition,this system is inefficient and requires a lot of manual review and verification in the process of digital forensics.In order to solve these problems,this paper proposes a blockchain certificate storage system based on verifiable certificates,which is intended to ensure that electronic evidence will not be tampered with during the digital forensics process,while ensuring the authenticity and validity of its data source.Through the introduction of blockchain technology and the use of consensus algorithms to ensure that all entity nodes participating in the evidence storage system are in a state of mutual trust in the network,it is difficult for electronic data to be tampered and attacked in the digital forensics process,ensuring the security and integrity of electronic data.In order to ensure the safe transfer and review of electronic evidence in the certificate storage system,this paper designs a decentralized identity management module to maintain the identity information of network entities.This module uniquely binds an identifier for each entity that joins the network.Through this identifier,the identity information of the identifier owner and the public and private key pair used for data encryption can be obtained,thereby ensuring that the entity transmits data securely in the network.The electronic evidence is directly issued as valid evidence in the final court review process.In order to ensure the authenticity and validity of electronic data sources,through verifiable certificates,a third-party authority such as a notary office is introduced in a decentralized way to endorse electronic data.The court can directly verify the certificate to determine whether the electronic data can be reviewed as valid evidence.The verifiable certificate contains the data to be proved and the content used to verify the validity of the certificate.The verifier can use these data to verify the validity and integrity of the content of the certificate.Finally,considering the performance of the certificate storage system,this paper analyzes and designs a set of storage solutions.The original evidence with more content is stored outside the block chain,while the digital fingerprint information that only represents the original evidence is stored on the block chain,the verifier can judge the integrity of the electronic evidence by comparing the two parts.At the same time,a storage structure such as the Merkle tree is used to optimize the storage pressure on the blockchain.Finally,through experimental analysis,we know that the blockchain system based on verifiable certificates can meet the current demand for certificate storage.