Crackme

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A crackme is a small computer program designed to test a programmer's reverse engineering skills.^[1] Crackmes are made as a legal way to crack software, since no intellectual property is being infringed.

Crackmes often incorporate protection schemes and algorithms similar to those used in proprietary software. However, they can sometimes be more challenging because they may use advanced packing or protection techniques, making the underlying algorithm harder to analyze and modify.