https://grit8086.github.io/tags/reversing/Recent content in Reversing on grit8086Hugoen-usTue, 03 Mar 2026 00:00:00 +0800https://grit8086.github.io/posts/crackme-1/Tue, 03 Mar 2026 00:00:00 +0800https://grit8086.github.io/posts/crackme-1/<h1 id="finding-a-serial-key-in-a-binary-and-patching-it">Finding a Serial Key in a Binary and Patching It</h1> <p>Today we’ll analyze a simple crackme from <strong>crackinglessons.com – Crackme #1</strong></p> <h2 id="objective">Objective</h2> <ol> <li>Identify the correct serial key.</li> <li>Patch the binary so it always displays the <strong>“Congrats!”</strong> message when the <em>Check</em> button is clicked.</li> </ol> <h1 id="understanding-the-program-behavior">Understanding the Program Behavior</h1> <p>When we run the program, it asks:</p> <p><strong>“Please enter the serial key”</strong></p> <p>If we enter an incorrect value, a message box appears:</p> <p><strong>“Wrong serial key. Try again.”</strong></p>