downloadbrowsesvan70's bb_crackme#1

Download, 12 kb (password:
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Find please the correct code
without patching.
Little crypto knowledge is advantage.
Good luck.

Difficulty: 2 - Needs a little brain (or luck)
Platform: Windows
Language: C/C++

Published: 16. Jun, 2014
Downloads: 469


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Solution by baderj, published 09. sep, 2014; download (55 kb), password: or browse.

baderj has rated this crackme as awesome.

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Discussion and comments

25. Jun 2014
Delete if this contains too much information.

Is the encryption subroutine invertible? Since the overflow is discarded, I don't think there is a way to take the required output and go in reverse.
28. Jun 2014
Also, can I get a working serial for this crackme? I had a math friend of mine look at the encryption algorithm, but he thinks it's mathematically impossible to create a working serial.
16. Jul 2014
Thanks n0p[cc] for the solution. Is here anyone with better solution then brute force? It is possible.
31. Jul 2014
I already described the mathematical solution in my solution. But I also uploaded/updated a new solution (waiting for approval) with an implementation of the mathematical solution with Square-and-Multiply.

03. Sep 2014
Very good beginners crackme, highly recommend. The code can be found very elegantly indeed without brute forcing.

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