FBI: Spies Hid Secret Messages on Public Websites Danger Room Wired.com
"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."
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