Crackme

<h2 id="keygenme">Keygenme</h2>

<p>A keygenme is specifically designed for the reverser to not only identify the protection algorithm used in the application but also create a small key generator (<a href="/facts/Keygen/CvCYJ973">keygen</a>) in the programming language of their choice.
</p><p>Most keygenmes, when properly manipulated, can be made self-keygenning. For example, during validation, they might generate the correct key internally and compare it to the user's input. This allows the key generation algorithm to be easily replicated.
</p><p>Anti-debugging and anti-disassembly routines are often used to confuse debuggers or render disassembly output useless.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> <a href="/facts/Obfuscation_(software)/703yhvVq">Code obfuscation</a> is also used to further complicate reverse engineering.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a>
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<h2 id="external-links">External links</h2>
<ul><li><a href="https://Crackmy.app">Crackmy.app</a> - Holds a variety of user-submitted crackmes. Users can submit solutions to the crackmes to strengthen the learning process. Includes reverse engineering resources and tools.</li></ul>
<ul><li><a href="https://crackmes.one">Crackmes.one</a> - Includes user-submitted crackmes for Windows and Linux, in languages such as C++ and Java.</li>
<li><a href="/facts/X64dbg/s5dGaRja">X64dbg</a> - A debugger used both by beginners and experienced people.</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>"crackmes.de Frequently Asked Questions". Archived from the original on 2006-07-14. Retrieved 2008-10-31. <a href="https://web.archive.org/web/20060714121844/http://www.crackmes.de/faq/" target="_blank">https://web.archive.org/web/20060714121844/http://www.crackmes.de/faq/</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>"Windows Anti-Debug Reference". Archived from the original on 2008-05-15. <a href="https://web.archive.org/web/20080515114824/http://www.securityfocus.com/infocus/1893" target="_blank">https://web.archive.org/web/20080515114824/http://www.securityfocus.com/infocus/1893</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
<li id="fn:3"><p>"Code Obfuscaton". Archived from the original on 2008-10-21. Retrieved 2008-10-31. <a href="https://web.archive.org/web/20081021074010/http://palisade.plynt.com/issues/2005Aug/code-obfuscation/" target="_blank">https://web.archive.org/web/20081021074010/http://palisade.plynt.com/issues/2005Aug/code-obfuscation/</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li>
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Crackme