Steganography
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Steganography describes methods for transmitting messages which hide the fact that there is a message--such as munging the low bits of each pixel in an image to encode a message. It is a form of Security by Obscurity, although the message itself may be encrypted in a separate step.
The word 'steganography' comes from the Greek steganos, meaning 'covered', plus graphein, meaning 'writing.' (Compare to cryptography, meaning 'hidden writing'.) The word first appeared in English in 1569 in James Sanford's Of the vanitie and uncertaintie of artes and sciences , a translation of Agrippa's "De incertitudine et vanitate scientiarum", first published in 1527. (Agrippa's book is a sprawling and sometimes confusing denunciation of Catholic orthodoxy).