http://www.wired.com/dangerroom/2010/06/alleged-spies-hid-secret-messages-on-public-websites/
"Steganography is simultaneously one of the oldest methods for secret communications, and one of the more advanced. The process dates back to the fifth century B.C., when the Greek tyrant Histiaeus shaved the head of one of his servants, tattooed a message on his head, and waited for his hair to grow back before sending the messenger out. When the courier arrived, his head was shaved and the missive was read, giving information about upcoming Persian attacks. Later on, secret inks were used on couriers’ backs. Morse code messages were woven into a sweater that was worn by a courier."
"Both before and after Sept. 11, there were rumors in the media that al-Qaida had begun hiding messages in digital porn. That speculation was never confirmed, as far as I can tell."
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