you have got no hope mate give up now
One-Time Pads.
The cipher itself is exceedlingly simple. To encrypt plaintext, P, with a key, K, producing ciphertext, C, simply compute the bitwise exclusive-or of the key and the plaintext:
C = K^P
To decrypt ciphertext, C, the recipient computes
P = K^C
It's that simple, and it's perfectly secure, as long as the key is random and is not compromised
one time key pads can use anything as a reference or key for the cypher, due to the nature of only two people knowing what the key is it's impossible to break, a rotating key used only once can not be cracked, you need to know the variables used in the cypher.
one of the typical one time keys used during the cold war was a deck of cards shuffled to a specific order and used only once. it couldn't be cracked till very recently and still requires weeks and a message longer than 52 characters, for better and quicker results the longer the message the easier it is to compromise.
as i said it is useless for transmission streams but when used for it's original purpose is still unbreakable especially when poly character cyphers where used to eep the message short