Code obfuscation has become a vital tool to protect, for example, intellectual property against competitors. In general, it attempts to impede program understanding by making the to-be-protected program more complex. As a consequence, a human analyst reasoning about the obfuscated code has to overcome this barrier by transforming it into a representation that is easier to understand. In this training, we get to know state-of-the-art code obfuscation techniques, look at how these complicate reverse engineering and learn how to break them.