downloadbrowsesaitob's Saibot's Crackme #5

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Hi again folkz! So I made a challenge for you.

I dont know what else to say about this challenge exept try making it without any patching!


No Patching

And as always, I'll be waiting for a tutorial!

Difficulty: 3 - Getting harder
Platform: Windows
Language: (Visual) Basic

Published: 20. Mar, 2007
Downloads: 417


Votes: 6
Crackme is quite bad.

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Discussion and comments

21. Mar 2007
One of those "Impossible to solve without luck" crackmes.
It hashes with MD5 the first line of License.dat file. Then the hash is converted to base64 and compared with fixed string.
21. Mar 2007
Hmm, it would appear, that MD5 must be brute-forced...
21. Mar 2007
Good luck, Have fun! ;D
30. Mar 2007
MD5 is a 128-bit hash, so we have 32-digit-Hashes.
Each digit can range from 0..f. That should lead us to
16^32 possible hashes. Is this a crackme based on luck or did I miss something? Are we supposed to use Rainbow tables?
30. Mar 2007
Don't even try to brute-force it. And I really think even Rainbow tables are useless here. Why? I forgot to add before, that the read line is converted to utf16 (unicode) and after that processed with MD5 [example: bundy -> unicode -> 'b',0,'u',0,'n',0,'d',0,'y',0 -> MD5 -> base64 -> compare with fixed string].
There were some "attacks" on MD5 recently, but I don't think any of those could be applied here (as I recall those were only on finding collisions in reasonable time - feel free to correct me). But maybe here, with those 0 chars between all these read chars, some weakness could be found. But I guess this is a task for some cryptoanalyst/cryptographer out there ;)
31. Mar 2007
Well, the MD5-Hash we are looking for is
I think I'm gonna give the rainbow tables a shot. This will take a while... :)
31. Mar 2007
Emm, yeah, it WILL take time ;D

Im sorry this is a boring and hard challenge if you not patch it, but hey, Im only learning, right! ;D

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