计算机科学 ›› 2019, Vol. 46 ›› Issue (4): 129-136.doi: 10.11896/j.issn.1002-137X.2019.04.021
巫岱玥, 李强, 余祥, 黄海军
WU Dai-yue, LI Qiang, YU Xiang, HUANG Hai-jun
摘要： 公有链无集中控制节点、去中心化和允许任意节点加入的特点使其拥有高效、低成本和高数据安全性的优势,但由于其允许任意节点接入,因此将增加公有链网络的脆弱性。基于Client Puzzle,提出一种节点接入控制模型CPACM(Client Puzzle based Access Control Model),使新节点接入公有链前利用算力进行工作量证明,完成工作量证明后才可接入公有链。该模型在维持公有链去中心化的同时,增加了接入控制。实验证明,该模型在不影响诚实节点加入的情况下,能以较高成功率限制低诚意节点和低算力节点的加入,并且能防止节点间的伙同,防范了恶意行为,提高了公有链网络的安全性。
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