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Crackmes, reversemes and keygenmes generally have similar protection schemes and algorithms to those found in proprietary software. However, due to the wide use of packers/protectors in commercial software,[further explanation needed] many crackmes are actually more difficult as the algorithm is harder to find and track than in commercial software.[further explanation needed]
A keygenme is specifically designed for the reverser to not only find the protection algorithm used in the application, but also write a small keygen for it in the programming language of their choice. However, most keygenmes, when properly manipulated, can be self-keygenning.[further explanation needed]
- crackmes.de - A site for testing reversing skills. Crackmes range from "Very Easy" to "Very Hard" for many operating systems.
- tdhack.com - Includes cryptographic riddles, hackmes and software applications to crack for both Windows and Linux. Polish and English languages are supported.
- Ollydbg - A program used both by beginners and experienced people.[further explanation needed]
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