what encryption method is used ?

[Dualla]

hi im new to all this encryption/decryption thing and i hope someone has the time to help me with this

my problem is i want to write a decryption/encryption programm for the crysis 2 profile xml files the gui/programm is nearly done the only thing that i cant find is the encryption/decryption method they used on the xml files ( since 3 days im trying to find it in the system file using ida ).

so my question is what method are they using to decrypt/encrypt the profile xml files ?

pc files --> http://www.megaupload.com/?d=XSC2FRXN

xbox 360 files --> http://www.megaupload.com/?d=NMQK6BL7



when there are spelling errors sorry im form germany ^^