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<li>这个也是老早之前发在看雪上的帖子，原帖地址: <a target="_blank" rel="noopener" href="https://bbs.kanxue.com/thread-274828.htm">https://bbs.kanxue.com/thread-274828.htm</a></li>
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<h3 id="前前言"><a href="#前前言" class="headerlink" title="前前言"></a>前前言</h3><ul>
<li>这个是老早之前发在看雪上的帖子，原帖地址: <a target="_blank" rel="noopener" href="https://bbs.kanxue.com/thread-274788.htm">https://bbs.kanxue.com/thread-274788.htm</a></li>
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<li><p>最近入手了ChipWhisperer的CW308 的底板，方便进一步学习侧信道攻击，详见官网介绍：<a target="_blank" rel="noopener" href="https://rtfm.newae.com/Targets/CW308%20UFO/">https://rtfm.newae.com/Targets/CW308 UFO/</a></p>
<p> <img src="/note/2023/04/CW308T-AVR%E4%BD%BF%E7%94%A8%E7%AC%94%E8%AE%B0/image-20230416125221810.png" alt="image-20230416125221810"></p>
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<li><p>有了底板之后就可以自从官方的github仓库中 <a target="_blank" rel="noopener" href="https://github.com/newaetech/chipwhisperer-target-cw308t">https://github.com/newaetech/chipwhisperer-target-cw308t</a> 获取pcb源码，自己打板制作更多的目标板了，打板pcb可以白嫖嘉立创，每月两次免费打板机会（规则貌似是：如果上月消费<20，那么两次免费打板仅限于立创EDA的工程文件，上月消费>=20，那么免费打板没有这个限制，具体以官方说明为准）</p>
</li>
<li><p>虽然嘉立创免费打板可能要受限于要立创EDA设计，但是基于ChipWhisperer开源的Altium Designer的工程文件和原理图，还是可以自己将AD工程移植为立创EDA工程</p>
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<li><p>最近实际逆向过程中，经常会遇到AES算法，而且有时也会遇到一些非标准AES或者魔改的AES</p>
</li>
<li><p>本着进一步了解AES算法的态度，决定结合网上各种资料，自己动手实现一次AES加解密，加深自己对AES的了解</p>
</li>
<li><p>当然网上有很多优秀的AES实现了，其中最著名的当属：<a target="_blank" rel="noopener" href="https://github.com/openssl/openssl">openssl</a>，openssl包含非常多的密码学算法的实现，而且很多都是性能优化后的实现。一个比较小巧的c语言实现是：<a target="_blank" rel="noopener" href="https://github.com/kokke/tiny-AES-c">https://github.com/kokke/tiny-AES-c</a></p>
</li>
<li><p>python的一些AES实现:</p>
<ul>
<li><p><a target="_blank" rel="noopener" href="https://gist.github.com/raullenchai/2920069">https://gist.github.com/raullenchai/2920069</a></p>
</li>
<li><p><a target="_blank" rel="noopener" href="https://github.com/hlilje/aes-python.git">https://github.com/hlilje/aes-python.git</a></p>
</li>
</ul>
</li>
<li><p>这里再介绍一下python的：<a target="_blank" rel="noopener" href="https://github.com/Legrandin/pycryptodome.git">pycryptodome</a>库，这个虽然是python库，但底层算法是c写的，所以性能上是非常不错的，可以安装这个库替换python的Crypto库，也可以与Crypto共存。这个库可以作为python中各种加密算法的标准库来使用。</p>
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<li><p>因为这里是以学习为目的，所以本文不考虑任何性能上的问题</p>
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<li><p>switch 硬破后，一般都把任天堂相关的域名IP屏蔽了，所以就不能自动联网校准时间</p>
</li>
<li><p>时间久了，switch的时间就会与标准时间偏差很大，使用Tinfoil下载就有可能会出现下面的错误，这种情况手动设置时间一般与无济于事</p>
<figure class="highlight text"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">SSL Connection failed.</span><br><span class="line">Your system clock is likely incorrect.</span><br><span class="line">Please ensure your system date time is set correctly.</span><br></pre></td></tr></table></figure>
</li>
<li><p>这时候就可以使用一个插件来同步时间：<a target="_blank" rel="noopener" href="https://github.com/nedex/QuickNTP.git">https://github.com/nedex/QuickNTP.git</a></p>
</li>
<li><p>但QuickNTP默认的几个服务器，有时候也会出现连不上情况</p>
</li>
<li><p>接下来介绍，如何将QuickNTP默认的NTP服务器替换为国内NTP服务器并重新编译.ovl文件</p>
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<li><p>最近学习chipwhisperer时，遇到了点问题，运行<code>import chipwhisperer.common.api.lascar as cw_lascar</code>会报两个错误"Unable to import LASCAR"和"NameError: name 'Container' is not defined"</p>
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<li><p>使用前面学习了那么多侧信道攻击的内容，是时候实战一波了</p>
</li>
<li><p>本文这道题来自<a target="_blank" rel="noopener" href="https://github.com/Riscure/Rhme-2016">https://github.com/Riscure/Rhme-2016</a>的<strong>piece_of_scake</strong>，下图为这题的提示信息</p>
<p> <img src="/tutorial/2022/09/%E4%BE%A7%E4%BF%A1%E9%81%93%E6%94%BB%E5%87%BB%E4%BC%AA%E5%AE%9E%E6%88%98-%E5%88%86%E6%9E%90%E4%B8%80%E9%81%93%E7%A1%AC%E4%BB%B6CTF%E9%A2%98/image-20220903214212850.png" alt="image-20220903214212850"></p>
</li>
<li><p>本文大部分内容基于这个视频中对这道题的解法，很不错的视频，值得一看：<a target="_blank" rel="noopener" href="https://www.youtube.com/watch?v=FktI4qSjzaE&list=PLhixgUqwRTjwNaT40TqIIagv3b4_bfB7M&index=14">https://www.youtube.com/watch?v=FktI4qSjzaE&list=PLhixgUqwRTjwNaT40TqIIagv3b4_bfB7M&index=14</a></p>
</li>
<li><p>与上面提到的视频不同，这里为了方便起见使用的硬件为用面包板构造的Arduino最小系统，这样做的好处在于接电阻、接线和拆器件方便</p>
</li>
<li><p>最近更新了关于这道CTF题的另一篇文章，可供参考：<a href="/note/2023/04/CW308T-AVR%E4%BD%BF%E7%94%A8%E7%AC%94%E8%AE%B0/" title="CW308T-AVR使用笔记">CW308T-AVR使用笔记</a></p>
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<li>最近为了方便折腾硬件CTF，于是准备用Atmega328P-PU搭建Arduino最小系统</li>
<li>需要用到的器件<ul>
<li>面包板 x1</li>
<li>Atmega328P-PU x 1</li>
<li>USB转UART x1（建议有DTR引脚的，可以用来自动Reset）</li>
<li>22pF 陶瓷电容 x2</li>
<li>16 MHz晶振</li>
<li>Arduino uno或者Arduino mini x1（用于给Atmega328P-PU芯片烧录bootloader）</li>
<li>导线（杜邦线，面包板线）</li>
<li>1µF (100nF) 陶瓷电容x2（可选）</li>
<li>10 kΩ电阻（可选）</li>
<li>二极管（可选）</li>
</ul>
</li>
</ul>
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<li><p>本篇将继续跟随<a target="_blank" rel="noopener" href="https://github.com/newaetech/chipwhisperer-jupyter">chipwhisperer-jupyter</a> sca101的教程来学习使用ChipWhisperer Analyzer提供的API来进行相关性能量分析（CPA）攻击</p>
<p> <img src="/note/2022/08/%E4%BE%A7%E4%BF%A1%E9%81%93%E6%94%BB%E5%87%BB%E5%AD%A6%E4%B9%A0%E7%AC%94%E8%AE%B08-ChipWhisperer-Analyzer-%E7%9B%B8%E5%85%B3%E6%80%A7%E8%83%BD%E9%87%8F%E5%88%86%E6%9E%90%E6%94%BB%E5%87%BB/cpa2.gif" alt="cpa2"></p>
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