Are there any steganography algorithms which are capable of hiding a (optionally encrypted) text message within another innocuous text message?
The scenario I envisage is that I would like to carry on an email conversation, which to a man in the middle looks completely innocent, even upon close scrutiny; but which infact contains the true message well hidden within the visible text.
I am aware of this technique being used to hide text within media files, however this sounds to me like it would be both cumbersome and suspicion-arousing to the man-in-the-middle if every message and its response has a media file attachment.
I don't currently have anything worth hiding and I am not doing anything illegal, but I value my privacy and I am very interested in cryptography.
An example would be:
Sender apparent message: Hi there Bob. How was your weekend? Mine was ... more text ... ciao
Sender real message: Did you find the password I requested?
Receiver apparent message: Pretty good. I caught up with ... more text ... ciao
Receiver real message: Yes, it was "password"