BuKoBG's KeyGenMe #1
| Download KeyGenMe.zip, 2 kb (password: crackmes.de) Browse contents of KeyGenMe.zip Hi people, I hope you have fun with this one :). PM me if something.
Difficulty: 2 - Needs a little brain (or luck) | RatingVotes: 5 View profile of BuKoBG » |
Solutions
Solution by Envy, published 25. may, 2010; download (12 kb), password: crackmes.de or browse.
Envy has rated this crackme as quite nice.
Discussion and comments
| Falo 14. May 2010 | easy KeygenMe, but there is a problem, after the serial checking is this here: 0040121B B8 00000000 MOV EAX,0 00401220 C3 RETN 0040114E C3 RETN 00401345 83F8 01 CMP EAX,1 00401348 75 16 JNZ SHORT KeyGenMe.00401360 0040134A 6A 00 PUSH 0 0040134C 68 84304000 PUSH KeyGenMe.00403084 ; ASCII "Correct" 00401351 68 8C304000 PUSH KeyGenMe.0040308C ; ASCII "Correct serial, good job !" this cannot work, MOV EAX, 0 and then CMP EAX, 1 ? the goal EAX = 1 cannot be reached through a correct serial or do i miss something ? if not this KeygenMe is not possible without patching |
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| BuKoBG Author 14. May 2010 | Falo, you are missing something :) |
| andrewl.us Moderator 15. May 2010 | looks like a good one; no more posted clues, please |
| tomkol 15. May 2010 | Quite nice one. There's no problem meeting given requirements. All you need is to look a bit closer what crackme is doing. And everything is reversible. |
| tomkol 15. May 2010 | It was nice and simple keygenme. Short solution submitted. |
| CronuX 15. May 2010 | I too solution submitted, and and I had fun doing keygen, was excellent you very much thank My keygen is coded in VB.NET CronuX |
| rutio 16. May 2010 | Was it solved without bruteforcing the serial until the CRC matches? I can only reverse CRC by using non-ASCII characters. |
| tomkol 16. May 2010 | Yes. You don't need to bruteforce crc. You can reverse it. Serial will be non-ASCII but who cares if it works. |
| rutio 19. May 2010 | What if a '\0' character comes up? |
| BoRoV 25. May 2010 | @Envy: good solution, but I have one question, your function <hash>, you really do not know what that CRC ? |
| Envy 28. May 2010 | At the time of the writing I did not, but after reading these comments and a little research, it's quite obvious :P |
| fireblast 01. Jun 2010 | Nice little keygenme. Searching for the magic number get to the needed algorithm :) . Only way I found to get a serial is to bruteforce it (1000 first numbers here but should be enough). For the one interested, here is my keygen : http://pastebin.com/EPhU5wDX |
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