every time you log in there are several bytes along with the log-in information (username is transferred as plain text and only password is encrypted) don't remember exactly how many as i don't play anymore and haven't touch anything for a long time. i think those bytes are involved in further encryption but as far as i remember basically all the packets are similar - they have a header, data, some 3 ghost bytes which maybe are a key or something and last bytes. for example: if you repeatedly throw something on the ground every time the packets are the same except for those 3 middle bytes. they are always different. but as i said don't remember exactly as i don't play this game for a long time..