downloadbrowsetamaroth's KeygenMe #2

Download keygenme_2_by_tamaroth.zip, 100 kb (password: crackmes.de)
Browse contents of keygenme_2_by_tamaroth.zip

Hey!

This is my another small keygenme, nothing complicated. Your task is to write a keygen that works at an instant speed.

I wrote it on the spur of the moment, so if you find some horrible bugs, pray tell!

Good luck and have fun!

Thanks to Buzzer for creating "Cubes"!

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

Published: 20. Mar, 2012
Downloads: 562

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Solutions

Solution by redoC, published 02. oct, 2012; download (330 kb), password: crackmes.de or browse.

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Discussion and comments

zhangke
27. May 2012		Hi tamaroth,
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keygenme2.exe - Unable To Locate Component
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This application has failed to start because MSVCR100.dll was not found. Re-installing the application may fix this problem.
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OK
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This message occured when I try to run this keygenme2.exe.
When you compiling the program in VS,You can set like the following to avoid this issue.
Project->Property->C/C++->Code Generation->Runtime Lirary(set this to /MT)

Regrads,
Ke
tamaroth
Moderator
30. May 2012		Yeah, it was build with /MD, I figured almost everyone has crt runtime installed, so why make crackme bigger :)

In any case, you can download redist here:
http://www.microsoft.com/en-us/download/keygenme_2_by_tamaroth.zip/details.aspx?id=14632 x86_64
http://www.microsoft.com/en-us/download/keygenme_2_by_tamaroth.zip/details.aspx?id=5555 x86
redoC
16. Sep 2012		Anyone have IDA signatures for GNU MP?
"The GNU Multiple Precision Arithmetic Library"

If so please post me a message.
tamaroth
Moderator
20. Sep 2012		You can blackbox most of it.

http://en.wikipedia.org/wiki/Blackboxing
redoC
25. Sep 2012		M=841423D9A83309F81F0069AB
N=E7C1D538F09CCC070A63A95B

BYTE HashValue[32] = SomeHash (Name&Group)
HashValue = HashValue mod N
RSAValue = pow (M, Serial) mod N
final condition: HashValue == RSAValue

... how to compute serial?
HMX0101
26. Sep 2012		That's a problem known as DLP, can be solved using algorithms like pollard-rho, index calculus, etc.

The author of the crackme wants you to calculate the serial at an instant speed, that's the interesting stuff about this crackme :-)
redoC
27. Sep 2012		Thanks, solution soon.

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