Researchers have devised a new scheme for hiding secret data within VoIP packets, making it possible to carry on legitimate voice conversations while stolen data piggybacks on the call undetected, making its way to thieves on the outside.
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Called transcoding steganography or TranSteg, the method calls for setting a larger-than-necessary payload space in VoIP packets and using the extra room to carry covert messages. In their experiment the researchers could send 2.2MB of covert data in each direction during an average seven-minute phone call.
As with all steganography, the objective is to deliver covert data without raising suspicions that a secret message even exists. (more)
As with all steganography, the objective is to deliver covert data without raising suspicions that a secret message even exists. (more)
IN PICTURES: A brief history of steganography
