Hiding secret messages in Skype silences:

A group of researchers from the Institute of Telecommunications of the Warsaw University of Technology have devised a way to send and receive messages hidden in the data packets used to represent silences during a Skype call.

Nice little proof of concept for steganography. It’s still obviously clear though that you’re talking to somebody, so it can only be used if the fact that you’re communicating with somebody doesn’t have to be a secret.

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