i`m into msil cracking and i need some help with the opcodes. i`ve patched some jump but now the exe throws an error saying "strong name validation failed...". i think that .net executables are checksummed per default, please confirm this and if so do you know a tool / offset - algorithm so i can code a patch for this. and if you have some docs about ms ill opcodes/file format and want to share you`ll make my day :]

I saw a paper on IL cracking at quequero, maybe it is worth a check? Hope it could help.

sorry for not searching the forum earlier, i`ve found some interesting hints. i promise next time i will use the search button. anyway if somebody have something to add (maybe an ideea about the algorithm of that check sum) please inform me

Read this:
http://www.woodmann.com/forum/showthread.php?t=6509

Then use this tool:
http://www.woodmann.com/forum/showthread.php?t=7373

Done.

1. Open the file in a hex editor

2. Search for the pattern:

08 - 00 (15 times) - 50 - 05 - 09 - 00 -80

3. Change the last part (80) to (00)

4. Have Phun.