Steganography is the art and science of hiding information by embedding messages within other, seemingly harmless messages. When a message is encrypted, it has no meaning, and it's easy to understand that it contains sensitive information, a secret - and someone might try to break it. Steganography solves this problem by hiding the sensitive information in a harmless file called carrier file.
This method of disguising data (steganography) is not infallible. But it considerable raise the work of any experienced code-breaker, who must identify first the right carrier, extract the sensitive data from it, and only after that (if he gets this far) - the hard work of breaking the encryption code.
Steganography is the perfect supplement for encryption.
The fake messages are the best method to create diversions. They contain randomly generated characters. The password is also randomly generated. Their only purpose is to distract the attention of your opponent. You can send multiple carriers with fake messages, and one with a real message. The addressee will recognize the right carrier from the meaning of that carrier. So you can say this method encrypts data with two keys: one for decryption, and the subjective one for recognition.
east-tec InvisibleSecrets provides five carriers: JPEG, PNG, BMP, HTML and WAV.