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Covert channels aim to hide the existence of communication between two or more parties. Such channels typically utilize pre-existing (overt) data transmissions to carry hidden messages. Internet-based covert channels often encode new information into unused (or loosely specified) IP packet header fields, or the time intervals between IP packet arrivals. The authors propose a novel covert channel embedded within the traffic of multiplayer, first person shooter online games. They encode covert bits as slight, yet continuous, variations of a player's character's movements. Movement information is propagated to all clients attached to a given game server, yet the channel remains covert so long as the variations are visually imperceptible to the human players.
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