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Puzzle - KeyGenme

by mindless 23rd Feb. 2008

Level: 4 - Needs special knowledge
Platform: Windows
Language: C/C++


This is my first crackme so I apologize in case you find it boring, specially hard or specially easy.
Any comments will be much appreciated.

The key is to make a working KeyGen for any username given. It's got some crypto inside and no
anti-debugging protection; hope you find this protection scheme interesting. I'm looking forward for
the feedback since this is my very first attempt of making such things.

Note: I've found some problems running it under Vista and I will try to fix them as soon as possible.

Thank you !


Difficulty: 4 - Needs special knowledge
Platform: Windows
Language: C/C++

Published: 23. Feb, 2009
Downloads: 391


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Solution by freesoul, published 05. mar, 2009; download (149 kb), password: or browse.

freesoul has rated this crackme as awesome.

Solution by ForFun, published 04. mar, 2009; download (8 kb), password: or browse.

ForFun has not rated this crackme yet.

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Discussion and comments

24. Feb 2009
sOooLving in process :P
04. Mar 2009
Thanks ForFun for the solution. You're right that I've put more into the thread stuff than in the algo itslef.

However I challenge everyone to try what it would really be a level 4 in my opinion:

Patch the binary so that it always prints the GoodBoy string for any username/password.

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