This crackme is (for me) uncrackable.
I know the alogrithm. So I can post it if no-one can find it.
I build in a good anti-debug function. I tried it out, and it works.
So comme on! And let us see what you can!

The maximum lenght of your username is 50.

Of course you have to write a keygen to win!

Enjoy cracking!
mcourteaux