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    <title>Excel on 知识带给我们自由</title>
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      <title>BUUCTF [GKCTF 2021]excel 骚操作 1</title>
      <link>https://yuexuan521.github.io/zh/posts/buuctf-gkctf-2021excel-%E9%AA%9A%E6%93%8D%E4%BD%9C-1/</link>
      <pubDate>Mon, 23 Jun 2025 08:30:00 +0000</pubDate>
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      <description>&lt;p&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://blog.csdn.net/qq_43871179/article/details/118310357&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;2021GKCTF Misc excel骚操作–详解&lt;/a&gt;
&lt;a href=&#34;http://appserver.gs1cn.org/ancc2020h/&#34;target=&#34;_blank&#34; rel=&#34;noopener noreferrer&#34;&gt;中国编码APP下载&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;
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&lt;h3 id=&#34;题目描述&#34;&gt;题目描述：&lt;/h3&gt;
&lt;p&gt;你真的了解excel吗（flag由flag头包裹&lt;/p&gt;</description>
      <content:encoded><![CDATA[<p>
<div class="post-img-view">
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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://blog.csdn.net/qq_43871179/article/details/118310357"target="_blank" rel="noopener noreferrer">2021GKCTF Misc excel骚操作–详解</a>
<a href="http://appserver.gs1cn.org/ancc2020h/"target="_blank" rel="noopener noreferrer">中国编码APP下载</a></p>
<p>
<div class="post-img-view">
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<h3 id="题目描述">题目描述：</h3>
<p>你真的了解excel吗（flag由flag头包裹</p>
<h3 id="密文">密文：</h3>
<p>下载附件，得到flag.xlsx文件</p>
<p>
<div class="post-img-view">
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<hr>
<h3 id="解题思路">解题思路：</h3>
<p>1、打开文件，hint： <code>我看见flag了，你呢？</code></p>
<p>
<div class="post-img-view">
    <a data-fancybox="gallery" href="https://cdn.jsdelivr.net/gh/yuexuan521/image/20251228190943700.png">
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<p>随便点击几个地方，发现有的单元格有数字 <code>1</code> ，而且不是均匀分布的。</p>
<p>
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<p>在这里，可以全选单元格，设置单元格格式中的数字类型为 <code>G/通用格式</code> ，就可以直观看到所有含数字 <code>1</code> 的单元格。</p>
<p>
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<p>
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<p>再通过单元格 <code>条件格式</code> ，将单元格中所有数字等于 <code>1</code> 的单元格标黑，看它的图案。</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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<p>
<div class="post-img-view">
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<p>最后调整单元格行高为27，可以发现这是个“码”。</p>
<p>
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    </a>
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<p>2、这其实是一个叫 <strong>汉信码</strong> 的二维码，需要使用中国编码网的中国编码APP，扫码得到flag。</p>
<p>下载地址： <a href="http://appserver.gs1cn.org/ancc2020h/"target="_blank" rel="noopener noreferrer">http://appserver.gs1cn.org/ancc2020h/</a></p>
<p>
<div class="post-img-view">
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<p>要想实现文中的隐藏效果，可以采取以下步骤：
1、单元格输入数字
2、单元格格式，数字选择自定义
3、类型中输入；；；</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>9ee0cb62-f443-4a72-e9a3-43c0b910757e<span class="o">}</span>
</span></span></code></pre></td></tr></table>
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