Social steganography

Steganography is the use of sending hidden messages in plain sight, such no one but the sender and receiver know of the message’s existence.  This article, linked from Schneier on Security discusses social steganography–using social know-how to tell one group of people a message, but not others, on a public forum.  Jargon and slang have long been used to keep outsiders from understanding a conversation.  Steganography allows communication to occur without outsiders even knowing it occurs: in this case, a message with distinct meanings for different social circles.

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