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<a class="post-title-link" href="/2019/12/02/FISCO-BCOS-source-code-reading-libconsensus/" itemprop="url">FISCO-BCOS 源代码研读(一) —— 共识算法模块</a></h1>
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<span id="/2019/12/02/FISCO-BCOS-source-code-reading-libconsensus/" class="leancloud_visitors" data-flag-title="FISCO-BCOS 源代码研读(一) —— 共识算法模块">
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6.7k
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<span class="post-meta-item-text">阅读时长 ≈</span>
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32
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<h2 id="一版本">一、版本</h2>
<ul>
<li>fisco-bcos：2.1.0</li>
<li>commit：cb68124d4fbf3df563a57dfff5f0c6eedc1419cc</li>
<li>branch：master</li>
</ul>
<h2 id="二共识模块框架">二、共识模块框架</h2>
<p>FISCO BCOS实现了一套可扩展的共识框架，可插件化扩展不同的共识算法，目前支持 <strong>PBFT(Practical Byzantine Fault Tolerance)</strong> 和 <strong>Raft(Replication and Fault Tolerant)</strong> 共识算法，共识模块框架如下图：</p>
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<a class="post-title-link" href="/2019/10/29/research-in-HotStuff/" itemprop="url">HotStuff:BFT Consensus in the Lens of Blockchain</a></h1>
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3.2k
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<span class="post-meta-item-text">阅读时长 ≈</span>
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14
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<p>Facebook 的Libra基于HotStuff进行改进，HotStuff可以将网络消息复杂度降到线性级，可在较多节点上进行部署（大于100），吞吐量相对于传统PBFT提升可观，并在数学上证明了安全性。</p>
<h2 id="传统bft-共识">1. 传统BFT 共识</h2>
<p>传统BFT共识存在以下缺陷：</p>
<ol type="1">
<li>需要提前知道所有参与者信息，较难扩容；</li>
<li>平方级别的消息传递复杂度；</li>
<li>增加大量节点会导致网络拥塞；</li>
<li>Leader节点会承受整个网络的负载，负载不均衡。</li>
</ol>
<p>同样，相对于PoX等的共识，有着重要的优势：</p>
<ol type="1">
<li>BFT协议速度只和与网络发送的短消息的速度有关，没有额外的能源消耗或等待时间；</li>
<li>交易延迟非常小，延迟与网络延迟同数量级；</li>
<li>容错率相对于PoX类型高很多。</li>
</ol>
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<p>匿名凭证的作用是允许用户证明当前identity符合某个属性，且不暴露出其他属性。本文描述的方法通过使用零知识证明的方式保证属性在披露的过程中不被其他人知道，且可实现凭证一次性使用，第二次用于展示给Verifier的时候会被感知。</p>
<p>由于其原稿难懂，有多个符号错误，计算错误，符号未命名的问题，所以本人进行翻译、纠正。</p>
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