To be honest those files are not encrypted at all at least server side... they are simply ascii database that require a binary open and to be treated as binary streams...
Let's do an example for itemtable.bit
you need to open it as binary and define a stream
the first 48 bytes contains the tool that as created the itemtable between each byte there is a null so you have to read 48 bytes and remove all the \x00 (null char)
after those 48 bytes there are a set of numbers
Major Version you need to read an Int16
Minor Version you need to read another Int16
UPDATETIME Unsigned int 64
etc etc
is a binary stream that needs to be read line by line.
in python it should be something like that
f = open("item_table.bit", "rb")
#Set the binary stream
stream = BinaryStream(f)
#Reading header from itemtable
TOOLNAME=stream.readBytes(48).replace('\x00', '')
VERSION1=stream.readInt16()
VERSION2=stream.readInt16()
UPDATETIME=stream.readUInt64()
UPDATETIME2=stream.readUInt64()
UPDATETIME3=stream.readUInt64()
UPDATETIME4=stream.readUInt64()
USERNAME=stream.readBytes(20).replace('\x00', '')
after the main header the tables start... and this is the most complicate section, a lot of tables exist and each table have a different structure based on the kind of items it contains
