ok i found out that i have a double encryption to deal with rsa and idea now with the idea i have been reading and i have found a few things but i am hazy on one thing say i get my 16 byte key and i have a 72 byte message do i decrypt the entire thing with the one key or do i xor the input and output together to make the next key for the next 8 bytes or no? i am confused by the CBC part of it