I just added challenges one & two, as I’ve had a few requests for these. Additionally, I have included the solutions for them as a separate download just to help you out, should this be necessary. The two challenges can be downloaded here: MD5 (one-and-two.zip) = 5f916c6459ffe8c4ca318c76bd368665 The solutions can be downloaded here: MD5 (solutions-one-and-two.zip) [...]
Welcome back and thanks for considering challenge number 11. Inspired by my last challenge, I made this one simpler yet more difficult. More of an effort has gone into the encryption, which now uses 4 rotating DWORD keys instead of 1 static DWORD key. It should be more of a challenge. I removed all garbage [...]
OK, here we are again with a new series of challenges, which will start with number 10. This one isn’t that difficult but it requires that you consider new options. I left half of this challenge easy to help you along, so you can solve this one two ways, the tough way and the easier [...]
My last reverseme was too easy due to the nature of the code de-obfuscation key length and usage. This time I have made some minor changes to precisely this portion of the code. Furthermore, I have added some anti-debugging stuff that I observed in a piece of malware. I hope you enjoy. Here is a [...]
Based on all the comments I have received on the previous two unlockmes (six and seven), I have created a new and improved version, which I will hope will offer more of a challenge than its predecessors. If you manage to find a valid Unlock Code, type it in and press the Unlock Code button. [...]
Here is my latest crackme, which is no longer a keygenme. I decided to drop that functionality as I feel that finding a valid Unlock Code for the code obfuscation is the only real challenge. If you manage to find a valid Unlock Code, type it in and press the Unlock Code button. If it [...]
All sorts of stuff is obfuscated here, including the serial-generation code as well as other “code” that may be of interest. I won’t say much more. After the unlock code has been found, type it in and it will de-obfuscate the serial generation code as with the two other challenges. If you enter an invalid [...]
The serial-generation code in this crackme is obfuscated, there are no signatures this time and the entire serial generation code has been re-written. After the unlock code has been found, type it in and it will de-obfuscate the serial generation code. If you enter an invalid code, the crackme will die (depending on your luck [...]
I chose to obfuscate most of the code in this crackme besides the unlock functionality. The serial generation code is the same as in my last crackme (#3) so there will be opcode signatures that will enable you to brute out the code encryption key. If you haven’t completed my last crackme, you should still [...]