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<span class=post-read-time>— 1 min read</span></div><script type=application/ld+json>{"@context":"https://schema.org/","@type":"ImageObject","contentUrl":"https:\/\/simeononsecurity.com\/img\/cover\/A_cartoon_hacker_wearing_a_cape_and_a_mask_standing.png","caption":"","license":"https://simeononsecurity.com/termsandconditions/","acquireLicensePage":"https://simeononsecurity.com/contactus/","creditText":"SimeonOnSecurity","creator":{"@type":"Person","name":"SimeonOnSecurity"},"copyrightNotice":"SimeonOnSecurity","associatedArticle":{"@type":"NewsArticle","headline":"HackTheBox - Challenge - Crypto - Weak RSA","url":"https:\/\/simeononsecurity.com\/writeups\/hackthebox-challenges-crypto-weak_rsa\/","datePublished":"2023-11-17 09:17:45.363684227 \u002b0000 UTC m=\u002b20.919168274","author":{"@type":"Person","name":"SimeonOnSecurity","url":"https:\/\/simeononsecurity.com\/authors\/simeononsecurity"}}}</script><figure class=post-cover itemscope itemtype=https://schema.org/ImageObject><meta 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id=TableOfContents><ul><li><a href=#provided-files>Provided Files:</a></li><li><a href=#walk-through>Walk-through:</a><ul><li><a href=#flag-example>Flag Example:</a></li></ul></li></ul></nav></aside></div><p>Solve the HTB Weak RSA Crypto challenge with ease. Based on the RSA cipher, this easy challenge requires the use of an automated RSA attack tool like the RsaCtfTool. Get the flag with a simple command and expand your crypto skills with HackTheBox challenges.</p><hr><h2 id=provided-files>Provided Files:
<a href=#provided-files class=h-anchor aria-hidden=true>#</a></h2><p><strong>You are provided with the following files:</strong></p><ul><li>flag.enc</li><li>key.pub</li></ul><h2 id=walk-through>Walk-through:
<a href=#walk-through class=h-anchor aria-hidden=true>#</a></h2><p>At first glance, you’d think you can decrypt the flag with the public key.<br>For that, we might use the OpenSSL package to decrypt the flag.
This time it’s a bit different and you’ll find that the OpenSSL package won’t work for this challenge.</p><p>We’ll use an automated RSA attack tool. A common python script is the
<span itemscope itemtype=https://schema.org/WebPage><meta itemprop=name content="RsaCtfTool"><meta itemprop=url content="https://github.com/Ganapati/RsaCtfTool"><a href=https://github.com/Ganapati/RsaCtfTool rel="noopener external">RsaCtfTool</a></span></p><div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-bash data-lang=bash><span style=display:flex><span>python3 RsaCtfTool.py --publickey ./key.pub --uncipherfile ./flag.enc
</span></span></code></pre></div><p>Simply put, this tool finds the flag easily for you in an automated fashion.</p><hr><h3 id=flag-example>Flag Example:
<a href=#flag-example class=h-anchor aria-hidden=true>#</a></h3><pre tabindex=0><code>HTB{XXXXXX_XXXXXXX_XXXXXX}
</code></pre><br></div><br><style type=text/css>.ml-form-embedSubmitLoad{display:inline-block;width:20px;height:20px}.g-recaptcha{transform:scale(1);-webkit-transform:scale(1);transform-origin:0 0;-webkit-transform-origin:0 0;height:}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.ml-form-embedSubmitLoad:after{content:" ";display:block;width:11px;height:11px;margin:1px;border-radius:50%;border:4px solid #fff;border-color:#fff #fff #fff transparent;animation:ml-form-embedSubmitLoad 1.2s linear infinite}@keyframes ml-form-embedSubmitLoad{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}#mlb2-8738881.ml-form-embedContainer{box-sizing:border-box;display:table;margin:0 auto;position:static;width:100%!important}#mlb2-8738881.ml-form-embedContainer h4,#mlb2-8738881.ml-form-embedContainer p,#mlb2-8738881.ml-form-embedContainer span,#mlb2-8738881.ml-form-embedContainer 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