Decrypt packets

Hi can any one give some hints how to decrypt incomming kall packets (int kal)?

Take a look at Noors source, should still work ~.~

ye i know, its my base for decrypt outgoing packets and its work nice but he don't decrypt incomming pacets only hook after kal decypt it.
Incoming packets are crypted whit one key (i think) but haw to figure this one ??

Take a look at gamedeception