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      <title>BUUCTF greatescape 1</title>
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      <guid>https://yuexuan521.github.io/zh/posts/buuctf-greatescape-1/</guid>
      <description>&lt;p&gt;
&lt;div class=&#34;post-img-view&#34;&gt;
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&lt;p&gt;&lt;strong&gt;BUUCTF: &lt;a href=&#34;https://buuoj.cn/challenges&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;https://buuoj.cn/challenges&lt;/a&gt;&lt;/strong&gt;&lt;/p&gt;
&lt;hr&gt;
&lt;p&gt;相关阅读
&lt;a href=&#34;https://ctf-wiki.org/&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;CTF Wiki&lt;/a&gt;
&lt;a href=&#34;https://hello-ctf.com/HC_Start/&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;Hello CTF&lt;/a&gt;
&lt;a href=&#34;https://ns.openctf.net/learn/&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;NewStar CTF&lt;/a&gt;
&lt;a href=&#34;https://blog.csdn.net/weixin_66146598/article/details/125131129&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;[BUUCTF] greatescape解析&lt;/a&gt;
&lt;a href=&#34;https://blog.51cto.com/u_16159500/6515299&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;BUUCTF：greatescape&lt;/a&gt;
&lt;a href=&#34;https://blog.csdn.net/chinese_cabbage0/article/details/144456714&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;buuctf-greatescape题目解析&lt;/a&gt;&lt;/p&gt;</description>
      <content:encoded><![CDATA[<p>
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<p><strong>BUUCTF: <a href="https://buuoj.cn/challenges"target="_blank" rel="noopener noreferrer">https://buuoj.cn/challenges</a></strong></p>
<hr>
<p>相关阅读
<a href="https://ctf-wiki.org/"target="_blank" rel="noopener noreferrer">CTF Wiki</a>
<a href="https://hello-ctf.com/HC_Start/"target="_blank" rel="noopener noreferrer">Hello CTF</a>
<a href="https://ns.openctf.net/learn/"target="_blank" rel="noopener noreferrer">NewStar CTF</a>
<a href="https://blog.csdn.net/weixin_66146598/article/details/125131129"target="_blank" rel="noopener noreferrer">[BUUCTF] greatescape解析</a>
<a href="https://blog.51cto.com/u_16159500/6515299"target="_blank" rel="noopener noreferrer">BUUCTF：greatescape</a>
<a href="https://blog.csdn.net/chinese_cabbage0/article/details/144456714"target="_blank" rel="noopener noreferrer">buuctf-greatescape题目解析</a></p>
<p>
<div class="post-img-view">
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             alt="在这里插入图片描述" 
              
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        />
    </a>
</div></p>
<h3 id="题目描述">题目描述：</h3>
<p>注意：得到的 flag 请包上 flag{} 提交</p>
<h3 id="密文">密文：</h3>
<p>下载附件，解压得到 <code>greatescape.pcap</code></p>
<p>
<div class="post-img-view">
    <a data-fancybox="gallery" href="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228185855078.png">
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             alt="在这里插入图片描述" 
              
             loading="lazy"
        />
    </a>
</div></p>
<hr>
<h3 id="解题思路">解题思路：</h3>
<p>1、过滤常见协议，如FTP、HTTP。在FTP协议中，查看TCP流，发现ssc.key文件，猜测为TLS密钥文件。（位置在 <code>tcp.stream eq 18</code> ）</p>
<p>
<div class="post-img-view">
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             alt="在这里插入图片描述" 
              
             loading="lazy"
        />
    </a>
</div></p>
<p>
<div class="post-img-view">
    <a data-fancybox="gallery" href="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228185857870.png">
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             alt="在这里插入图片描述" 
              
             loading="lazy"
        />
    </a>
</div></p>
<p>在 <code>tcp.stream eq 19</code> ，可以找到ssc.key密钥文件数据，另存为ssc.key文件。</p>
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<pre tabindex="0" class="chroma"><code class="language-python" data-lang="python"><span class="line"><span class="cl"><span class="o">-----</span><span class="n">BEGIN</span> <span class="n">PRIVATE</span> <span class="n">KEY</span><span class="o">-----</span>
</span></span><span class="line"><span class="cl"><span class="n">MIIJQwIBADANBgkqhkiG9w0BAQEFAASCCS0wggkpAgEAAoICAQC5twyPH</span><span class="o">+</span><span class="mi">2</span><span class="n">U6X0Q</span>
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</span></span><span class="line"><span class="cl"><span class="n">lTePtbD</span><span class="o">/</span><span class="n">FRqWi310Q5U2GLjkYkWfxyZ</span><span class="o">+</span><span class="mi">1</span><span class="n">pDpQ6</span><span class="o">/</span><span class="n">jt</span><span class="o">/</span><span class="n">xaXoacaVTmhgKpNkTSEBhJ</span>
</span></span><span class="line"><span class="cl"><span class="n">Y</span><span class="o">/</span><span class="n">EIV</span><span class="o">/</span><span class="n">F3IqM6jcH6uBewWhpKUspZf7jTJeuZBJXA1gMF20MvxqLhzymPqGcPaU9g</span>
</span></span><span class="line"><span class="cl"><span class="mi">7</span><span class="n">tbjUEkunQ8AFI40xpmc28cD5MHOS2ms3GwYLdtnTH65aJwiajBM62QSw</span><span class="o">/</span><span class="mi">3</span><span class="n">RU67W</span>
</span></span><span class="line"><span class="cl"><span class="n">rWkCggEBAOtMBi9ko4ZR96BCFcuyPsiMcoDBQBEFgH</span><span class="o">/</span><span class="n">drT3hMlwmmVt5dcInw3Zk</span>
</span></span><span class="line"><span class="cl"><span class="n">DQb3gIWHP1Ul</span><span class="o">//</span><span class="n">Ma8qwSeuIua0</span><span class="o">+</span><span class="mi">6</span><span class="n">wkQ3NcsDywlJ2cqfZUe7kVJTCl8fuudTAYqT</span>
</span></span><span class="line"><span class="cl"><span class="n">Bs5Y1ktYPSyQOxmidMeX5IcGe5fPSdpFu9wMXXQ31l8o9SzccFKwz1P1o8G00xvx</span>
</span></span><span class="line"><span class="cl"><span class="n">wtcfAZ204Dcrdfm6xTWmzMrHqngS1uUDOJbW175gQqeAszy8wLMz41Yau3ypk3ga</span>
</span></span><span class="line"><span class="cl"><span class="n">edWr4Hzbiph0V1Dv</span><span class="o">/</span><span class="n">V</span><span class="o">+</span><span class="n">kmmreWBmHetH6bhrTWQq3UZ5WbGMpiTmSsD0EXU5vZLbX</span>
</span></span><span class="line"><span class="cl"><span class="n">xmZSEXjNvG9grjxwR96vp1PK</span><span class="o">/</span><span class="mi">4</span><span class="n">Bq1jo</span><span class="o">=</span>
</span></span><span class="line"><span class="cl"><span class="o">-----</span><span class="n">END</span> <span class="n">PRIVATE</span> <span class="n">KEY</span><span class="o">-----</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>
<div class="post-img-view">
    <a data-fancybox="gallery" href="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228185859533.png">
        <img src="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228185859533.png" 
             alt="在这里插入图片描述" 
              
             loading="lazy"
        />
    </a>
</div></p>
<p>
<div class="post-img-view">
    <a data-fancybox="gallery" href="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228185902069.png">
        <img src="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228185902069.png" 
             alt="在这里插入图片描述" 
              
             loading="lazy"
        />
    </a>
</div></p>
<p>2、在Wireshark中，通过“编辑 &gt; 首选项 &gt; Protocols &gt; TLS”，点击“Edit”后添加Key File并输入ssc.key，最后确认即可完成TLS协议解密。</p>
<p>
<div class="post-img-view">
    <a data-fancybox="gallery" href="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228185904153.png">
        <img src="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228185904153.png" 
             alt="在这里插入图片描述" 
              
             loading="lazy"
        />
    </a>
</div></p>
<p>使用如下过滤语句，即可得到flag： <code>INS{OkThatWasWay2Easy}</code></p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-python" data-lang="python"><span class="line"><span class="cl"><span class="n">http</span> <span class="n">contains</span> <span class="s2">&#34;FLAG&#34;</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>
<div class="post-img-view">
    <a data-fancybox="gallery" href="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228185906018.png">
        <img src="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228185906018.png" 
             alt="在这里插入图片描述" 
              
             loading="lazy"
        />
    </a>
</div></p>
<h3 id="flag">flag：</h3>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre tabindex="0" class="chroma"><code><span class="lnt">1
</span></code></pre></td>
<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-bash" data-lang="bash"><span class="line"><span class="cl">flag<span class="o">{</span>OkThatWasWay2Easy<span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div>]]></content:encoded>
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