本文我们以某安部的官网为例，破解某速乐的加密策略。本站的加密技术比较简单，适合小白进行练手。
1. 抓包分析
打开调试面板，分析请求，发现成功请求的 cookie 中有 __jsl_s=...，同时前三个请求返回了 521，这是某速乐的典型特征。前面的三个请求其实是 状态码欺骗，服务器返回的东西被浏览器请掉了。
我们想要进行逆向分析，要借助于 Fiddler 抓包工具，使用抓包工具不会出现请求返回内容被清掉的情况。如果不想使用抓包工具，也可以直接打 script 断点，然后进行断点调试，也能找到函数加密的入口，但是会比较麻烦。 我们使用 Fiddler 进行抓包，通过分析多次请求的变化，发现在成功请求之前，浏览器向服务器发送了两次，
第一次请求：
返回 cookie 中的 __jsluid_s，同时在返回的 script 中隐藏返回了 __jsl_clearance_s。
执行返回的 JS 代码，可以直接得到结果，如果不嫌麻烦也可以正则替换。
第二次请求：
前面的得到的 cookie 中的 __jsluid_s 和 __jsl_clearance_s 都被请求作为参数携带，之后服务器返回了一段新的代码。
第三次请求：
分析发现，第三次请求的 cookie 中，__jsl_clearance_s 被修改了，这个修改应该是在第二次请求返回后完成的，我们继续分析第二次请求的返回内容。
通过分析发现返回的 HTML 中有一段 script， 分析后发现这是一段 JS代码。
返回的 JS 代码为：
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2. 逆向分析
格式美化后复制到 Notepad 并折叠展示。
观察发现代码都已经被做了混淆，根据经验判断是 ob 混淆，我们用反混淆工具 http://www.jsnice.org/ 进行反混淆操作。
打开乐易调试工具，将反混淆后的 JS 代码复制进去。根据报错，我们依次添加 var targetLocale = UA值、document={};、注释掉 if (window["callPhantom"] || window["_phantom"]、注释 location["href"]=...、注释 setTimeout(function() {...、导出 document["cookie"]、赋值 arg={"bts" : ["16403 ...、执行 go(arg)。
最后得到返回值：__jsl_clearance_s=1640352135.056|0|09RqBYO0nUDN4n9GAdr1E0z1QbI%3D;Max-age=3600; path = /。
