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<!DOCTYPE HTML><html lang="zh-CN"><head><meta charset="utf-8"><meta name="keywords" content="网络安全, huang"><meta name="description" content=""><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no"><meta name="renderer" content="webkit|ie-stand|ie-comp"><meta name="mobile-web-app-capable" content="yes"><meta name="format-detection" content="telephone=no"><meta name="apple-mobile-web-app-capable" content="yes"><meta name="apple-mobile-web-app-status-bar-style" content="black-translucent"><script async src="https://www.googletagmanager.com/gtag/js?id="></script><script>function gtag(){dataLayer.push(arguments)}window.dataLayer=window.dataLayer||[],gtag("js",new Date),gtag("config","")</script><title>网络安全 | huang</title><link rel="icon" type="image/png" href="/favicon.png"><link rel="stylesheet" href="/libs/awesome/css/all.css"><link rel="stylesheet" href="/libs/materialize/materialize.min.css"><link 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203 107.8 198.3 112.5 181.9 128.9 168.3 122.5 157.7 114.1 157.9 116.9 156.7 120.9 152.7 124.9L141 136.5C139.8 137.7 141.6 141.9 141.8 141.8Z" fill="currentColor" class="octo-body"></path></svg></a></nav></header><div class="bg-cover pd-header post-cover" style="background-image:url(/medias/featureimages/10.jpg)"><div class="container" style="right:0;left:0"><div class="row"><div class="col s12 m12 l12"><div class="brand"><h1 class="description center-align post-title">网络安全</h1></div></div></div></div></div><main class="post-container content"><link rel="stylesheet" href="/libs/tocbot/tocbot.css"><style>#articleContent h1::before,#articleContent h2::before,#articleContent h3::before,#articleContent h4::before,#articleContent h5::before,#articleContent h6::before{display:block;content:" ";height:100px;margin-top:-100px;visibility:hidden}#articleContent :focus{outline:0}.toc-fixed{position:fixed;top:64px}.toc-widget{width:345px;padding-left:20px}.toc-widget .toc-title{margin:35px 0 15px 0;padding-left:17px;font-size:1.5rem;font-weight:700;line-height:1.5rem}.toc-widget ol{padding:0;list-style:none}#toc-content{height:calc(100vh - 250px);overflow:auto}#toc-content ol{padding-left:10px}#toc-content ol li{padding-left:10px}#toc-content .toc-link:hover{color:#42b983;font-weight:700;text-decoration:underline}#toc-content .toc-link::before{background-color:transparent;max-height:25px}#toc-content .is-active-link{color:#42b983}#toc-content .is-active-link::before{background-color:#42b983}#floating-toc-btn{position:fixed;right:15px;bottom:76px;padding-top:15px;margin-bottom:0;z-index:998}#floating-toc-btn .btn-floating{width:48px;height:48px}#floating-toc-btn .btn-floating i{line-height:48px;font-size:1.4rem}</style><div class="row"><div id="main-content" class="col s12 m12 l9"><div id="artDetail"><div class="card"><div class="card-content article-info"><div class="row tag-cate"><div class="col s7"><div class="article-tag"><span class="chip bg-color">无标签</span></div></div><div class="col s5 right-align"><div class="post-cate"><i class="fas fa-bookmark fa-fw icon-category"></i> <a href="/categories/Basic/" class="post-category">Basic</a></div></div></div><div class="post-info"><div class="post-date info-break-policy"><i class="far fa-calendar-minus fa-fw"></i> 发布日期: 2020-08-22</div></div></div><hr class="clearfix"><div class="card-content article-card-content"><div id="articleContent"><h1 id="密码学"><a href="#密码学" class="headerlink" title="密码学"></a>密码学</h1><h2 id="对称加密"><a href="#对称加密" class="headerlink" title="对称加密"></a>对称加密</h2><p>对称加密算法的加密和解密使用的密匙是相同的，也就是说如果通讯两方如果使用对称加密算法来加密通讯数据，那么通讯双方就需要都知道这个密匙，收到通讯数据后用这个密匙来解密数据。</p><p>这类算法在加密和解密时使用相同的密钥，或是使用两个可以简单地相互推算的密钥。事实上，这组密钥成为在两个或多个成员间的共同秘密，以便维持专属的通信联系。与非对称加密相比，要求双方获取相同的密钥是对称密钥加密的主要缺点之一。常见的对称加密算法有 <code>DES、3DES、AES、Blowfish、IDEA、RC5、RC6</code>。</p><p><strong>对称加密的速度比公钥加密快很多，在很多场合都需要对称加密</strong>。</p><h2 id="非对称加密"><a href="#非对称加密" class="headerlink" title="非对称加密"></a>非对称加密</h2><p>它需要两个密钥，<strong>一个是公开密钥，另一个是私有密钥；一个用作加密的时候，另一个则用作解密</strong>。使用其中一个密钥把明文加密后所得的密文，只能用相对应的另一个密钥才能解密得到原本的明文；甚至连最初用来加密的密钥也不能用作解密。由于加密和解密需要两个不同的密钥，故被称为非对称加密；</p><p>虽然两个密钥在数学上相关，但如果知道了其中一个，并不能凭此计算出另外一个；因此其中一个可以公开，称为 <strong>公钥</strong>，任意向外发布；不公开的密钥为 <strong>私钥</strong> ，必须由用户自行严格秘密保管，绝不透过任何途径向任何人提供，也不会透露给要通信的另一方，即使他被信任。</p><blockquote><p>公钥 & 私钥 均可以作为加密密钥</p></blockquote><h2 id="数字签名"><a href="#数字签名" class="headerlink" title="数字签名"></a>数字签名</h2><p>数字签名是一种类似写在纸上的签名，但是使用了 <strong>公钥加密领域的技术实现</strong> ，用于鉴别数字信息的方法。在网络上，我们可以使用“数字签名”来进行身份确认。数字签名是一个独一无二的数值，若公钥能通过验证，那我们就能确定对应的公钥的正确性，数字签名兼具这两种双重属性：“可确认性”及”不可否认性（不需要笔迹专家验证）”。</p><p>数字签名就是将公钥密码反过来使用。签名者将讯息用私钥加密（<strong>这是一种反用，因为通常非对称加密中私钥用于解密</strong>），然后公布公钥;验证者使用公钥将加密讯息解密并比对消息（一般签名对象为消息的散列值）。</p><h2 id="密码散列函数"><a href="#密码散列函数" class="headerlink" title="密码散列函数"></a>密码散列函数</h2><p>密码散列函数（英语：<code>Cryptographic hash function</code>），又译为加密散列函数、密码散列函数、加密散列函数，是散列函数的一种。它被认为是一种 <strong>单向函数</strong>，也就是说极其难以由散列函数输出的结果，回推输入的数据是什么。这种散列函数的输入数据，通常被称为消息（ <code>message</code> ），而它的输出结果，经常被称为消息摘要（ <code>message digest</code> ）或摘要（ <code>digest</code> ）。</p></div><hr><div class="reprint" id="reprint-statement"><div class="reprint__author"><span class="reprint-meta" style="font-weight:700"><i class="fas fa-user">文章作者:</i></span> <span class="reprint-info"><a href="https://hyl2048.github.io" rel="external nofollow noreferrer">yulin</a></span></div><div class="reprint__type"><span class="reprint-meta" style="font-weight:700"><i class="fas fa-link">文章链接:</i></span> <span class="reprint-info"><a href="https://hyl2048.github.io/45331.html">https://hyl2048.github.io/45331.html</a></span></div><div class="reprint__notice"><span class="reprint-meta" style="font-weight:700"><i class="fas fa-copyright">版权声明:</i></span> <span class="reprint-info">本博客所有文章除特別声明外，均采用 <a href="https://creativecommons.org/licenses/by/4.0/deed.zh" rel="external nofollow noreferrer" target="_blank">CC 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