a newbie question about CRC32

how can we patch a program protected with CRC32.. is there any tools out thier can remove this kind of protection .. please help..

[dyn!o]

CRC32 is not a protection itself but simply checksum algorithm.

If you have found that your soft uses CRC32 and don't know how to locate and eliminate the verification code then I suggest to use a loader instead of patching.

thankz for your reply dyn!o .. I used (Krypto ANALyzer) which list this thing

CRC32::00191B68::00593168
|-Referenced at 00481C8C
|-Referenced at 00481CAC
|-Referenced at 00481CC7
|-Referenced at 00481CE3
|-......................

if that what you ment by locating the code Now what the next step.. to eliminate the verification code..

best regards..

Originally Posted by abccc

how can we patch a program protected with CRC32.. is there any tools out thier can remove this kind of protection ..

Read the article "CRC and how to Reverse it" by Anarchriz/DREAD
_http://www.xs4all.nl/~koekeroe/hacked/crc.htm
If you find where CRCvalue is stored in your program you could change it to required value after program patching.

Thankz a lot Sergey R. ..it is such along essay thoo

sorry.. but it seems hard to understand ....is there a tool to remove or recalculate or correct CRC32 for me.. I appreciated your help

[MaRKuS-DJM]

use PEiD CRC32 Plugin

thankz alot for your reply MaRKuS-DJM .. could you please explain what you mean..

I used (Krypto ANALyzer) which list this information

CRC32::00191B68::00593168
|-Referenced at 00481C8C
|-Referenced at 00481CAC
|-Referenced at 00481CC7
|-Referenced at 00481CE3
|-......................

now what next..I realy appreciated your help..