基于哈希值分组和信任主节点选取的共识机制OACSTPCD

Practical Byzantine Fault Tolerance algorithm(PBFT)is one of the most popular consensus mechanisms.However,the com-munication mode of its broadcast leads to high communication complexity.Although the improved method of hierarchical node consensus reduces the communication scale of the algorithm,there are still shortcomings in security and efficiency of the algorithm.Based on this,an improved HBFT algorithm is proposed.Firstly,the nodes are grouped according to the hash value of MAC address,which increases the randomness of node grouping and makes the distribution of Byzantine nodes more uniform.Secondly,the consensus process,commu-nication content and view replacement protocol of the algorithm are optimized to further reduce the communication scale and improve the speed of master node replacement and fault handling.Finally,the credit mechanism is introduced and the master node is selected based on it.It improves the reliability of the master node and the security of the algorithm.From the perspective of theory,experiment and safety,it is showed that the consensus efficiency of HBFT algorithm is improved by 96.1%～98.6%and 51.3%～89.7%compared with PBFT algorithm and layer-based improved algorithm.In addition,HBFT algorithm has higher security.