基于区块链的可扩展电子取证模型研究

Research on scalable digital forensics model based on blockchain

针对现有区块链在电子取证方面存在的可扩展性和可用性较差的问题,设计了一种基于委托权益证明—实用拜占庭容错的链上链下结合的区块链电子取证模型。首先通过委托权益证明的方法投票选出区块生产者,然后仅在区块生产者之间运用实用拜占庭机制进行同步,针对区块链技术本身不适于存储大容量数据的特点,采用链上链下结合的方式进行数据存储。对所提模型进行了安全性和效率分析,证明其能同时满足安全、性能的需求,可以很好地支持电子取证。

In order to solve the shortcomings of weak scalability and availability,this paper proposed a parallel storage blockchain digital forensics model based on the combination entrusted equity and practical Byzantine fault tolerance.Firstly,it selected the block producers by the method of delegated proof of stake,and then used the practical Byzantine fault tolerance mechanism to synchronize the block producers.In view of the characteristics that the block chain technology itself was not suitable for storing large capacity data,it applied a combination of blockchain and off-chain storage to overcome this problem.The safety and efficiency analysis of the proposed model proves that it can meet the requirements of safety and performance at the same time,and can serve digital forensics feature well.