wanting help to make the crc?

well you need to know c++ and what the unpacked dekaron.exe is doing, here is a link to c++ for dummies, read and then help with the new crc bypass.


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please thank me if helpful

I think Assembly language is a must make CRC bypass because when you debug, you see all command in Assembly language.

I know C++ but that doesnt help me make a CRC bypass. Disassembling isn't my strong point

Quote:

Originally Posted by GMThunder well you need to know c++ and what the unpacked dekaron.exe is doing, here is a link to c++ for dummies, read and then help with the new crc bypass. [Only registered and activated users can see links. Click Here To Register...] please thank me if helpful

Not enough knowledge in assembly lang yet, but I thank you for the book :D

EDIT:
password?

Quote:

Originally Posted by Noi Not enough knowledge in assembly lang yet, but I thank you for the book :D EDIT: password?

the password is:
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its a start, so i think we have to look at the reqests and lines that are used for the crc check, i will have a look at nebs tut. he made them before so if he says his tut is the way then its in the right direction

i'll learn it (or try to at least). I'm good at computers, so it shouldn't be too hard. Just tell me what all I need to do. I'd be more than happy to help!

I'm fluent with c++ and a few other languages as well as networking, Machine Language is something I'm less familiar with. However, I have been looking at unpacked versions with Olly and studying them. I will help where I can.

I prefer IDA pro. :P

Quote:

Originally Posted by CrystalMaiden I prefer IDA pro. :P

I'll look into it, as I don't have a favorite picked out yet and I'm looking for ease of use as well as a powerful disassembler. I've only skimmed thro a google result list of disassemblers then I decided to get some research material on Machine Language and I'm reading up on that now; brushing up on what I already know and learning new things.

what programs are you using to learn machine language?

Quote:

Originally Posted by CrystalMaiden I prefer IDA pro. :P

Why do you prefer IDA?



btw C++ is the basic groundwork (source files), while assembler is editing the client (making a new crc).

Quote:

Originally Posted by GMThunder what programs are you using to learn machine language?

I'm not using programs to learn Machine Language, I'm reading documentation on it; refreshing up on 16/32 modes and registers, operands, etc... and learning a few things here and there.

I've merely toyed around with a couple disassemblers. So far, I like IDA better because of the more detailed graphical interface. But I'll continue playing with different ones and reading reasons why people prefer different ones.

According to Nebular's research, possible ways to bypass CRC checks:
1.Do not modify files on disk, let the client calculate correct CRC and then make changes directly in memory.
2.Modify client code so it will load valid files only for CRC calculation from other location, not from pak.d04.Files in pack.d04 then can freely modified. (GG Killer will be required to run such exectauble)
3.Intercept packets 4000010, store parameters from it,calculate CRC based on valid files and then modify packet 4000011 with correct CRC.

I'll choose No.2 for it.

And here is some guild using Ollydbg: [Only registered and activated users can see links. Click Here To Register...]

I guess we need both.

^ Huh?

I asked why you prefer IDA, not what it is....

and wtf, thats not reverse engineering....we already know how the client checks the game files (a packet with a crc value) and we don't want to generate the same client just in a different way (reverse engineering = analysis of data - creation of same data w. different technique)

Anyways, if there are people who wanna work with me on a crc and you have programming/disassembling/al experience PM me your MSN messenger email.