面向数据安全共享的区块链技术研究

Research on Blockchain Technology for Data Security Sharing

为区块链技术的安全性,提出一种基于改进的PBFT算法医院区块链数据共享方法,方法首先通过改进PBFT算法的主节点选择策略,通过拥有最大Ti值的节点当选主节点,减少了与其他节点间的通信,降低了通信开销,避免出现传播延时,避免恶意节点成为主节点,再加之通过设置区块验证阶段和生成正式块的验证阈值,提高了数据共享的安全性。最后对算法的吞吐量、通信次数、交易延迟、安全性和主节点选取的优势进行了仿真分析。仿真结果表明:相较于传统PBFT算法、SG-PBFT算法,所提的改进PBFT算法TPS显著提高,交易延迟出现的概率低,改进的PBFT算法在处理大规模数据的场景中的优势明显。相对于Raft算法和Bully算法,本研究的算法的显著降低了传播延时和通信开销。本研究提出的算法为物联网区块链数据的安全识别共享提供了参考。

In order to improve the security of blockchain technology,a blockchain data recognition and sharing method based on the modified PBFT algorithm is proposed.The method first improves the main node selection strategy of the PBFT algorithm,selecting the node with the maximum Ti value as the main node,reducing communication with other nodes,reducing communication overhead,avoiding propagation delay,and avoiding malicious nodes becoming the main node,In addition,by setting the block verification stage and generating formal block verification thresholds,the security of data sharing is improved.Finally,simulation analysis was conducted on the algorithm's throughput,communication times,transaction delay,security,and advantages of selecting the main node.The simulation results show that compared to the traditional PBFT algorithm and SG-PBFT algorithm,the proposed improved PBFT algorithm significantly improves TPS and has a low probability of transaction delay.The improved PBFT algorithm has significant advantages in processing large-scale data scenarios.Compared to Raft algorithm and Bully algorithm,the algorithm in this study significantly reduces propagation delay and communication overhead.The algorithm proposed in this study provides a reference for the secure identification and sharing of IoT blockchain data.