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HellBound Hackers | Challenges | Application Cracking

Author

App 9 Keygen

dopeboimag1k
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Posted on 06-06-11 08:58
I have completed this challenge, but I don't have a good understanding of how the key is being generated from the username that you put in because I just changed a jump instruction to get the password.

I read the article about creating a keygen and have gathered that there's a sequence of code that I need to understand, but I haven't had much success deciphering that code because I'm not very good with assembly. I'm not looking for someone to explain the code to me outright. I'm looking for someone that I can PM to give me hints to make me think and understand the code on my own.

Thanks in advance for any help.

Edited by dopeboimag1k on 06-06-11 08:59
Author

RE: App 9 Keygen

elmiguel
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Posted on 06-06-11 12:52
Congrats on completing the challenge. If you want to make a keygen for this challenge you will need to find the block that creates the serial. You can either, take that block and make a few changes to it and recompile it through a assembler; or sit down and rewrite it out in laymen terms in order to code it in your language of choice. I am, by no means, not an expert on asm but sitting there with the code and some references usually helps. If you have gotten this far with app cracking then you should have a few asm references available to you.


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Edited by elmiguel on 06-06-11 12:55
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Author

RE: App 9 Keygen

dopeboimag1k
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Posted on 06-06-11 16:47
In order to make a keygen is it essential that I know exactly what's happening as a whole, or could I just take the code line by line and port it to C or something?


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Author

RE: App 9 Keygen

stranac
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Posted on 06-06-11 17:38
Well, if you understand the code as a whole, you can make a better and simpler keygen by using your languages functions and stuff like that.

That said, you could port the code line by line, but you would need to understand exactly what part of code is doing what. IMO if you understand what each line's function is, it's easy to understand the code as a whole as well.

There is however a technique called code ripping which uses inline assembly in C++ code using the __asm keyword. That makes keygenning much easier to do if you don't understand the code. You can just copy the asm, modify it slightly and use it in your program.