About using mistakes as part of a code Could a code be developed where one uses intentional errors  say in english, as a text to encode? For example someone might have a message 'Agent X must report to station 5'. This could be distorted to 'A Gentex missed repaired 2 stationS.' The distorted message then encoded. If the distortions are recognizable to the deciferer this might throw off any attempted interceptions. Also aren't decoding methods usually based on the 'regular' use of english (if english is being used) ? I've never heard of anybody trying to use intentional mistakes in a code. Is this idea useful?
The short answer is that such an encoding would not help with encrypting the content.

A good, modern encryption scheme should at least be secure if the attacker can choose the plaintext, let alone know what the plaintext is. Moreover, most of them are secure if the attacker can even ask for the decryption of ciphertexts of his choice (other than the actual challenge message they're trying to decrypt).

It is worth reading up on known-plaintext-attack, chosen-plaintext-attack and chosen-ciphertext-attacks.