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DeltaShaper – Video Stream Synthesis for Internet Censorship Circumvention

Citizens living in countries ruled by repressive regimes may have access to rightful information blocked or may be prevented from sharing such information freely on the Internet. In spite of all efforts to hinder the transmission of potentially compromising data, even the most oppressive regimes cannot afford to block all channels with the outside world, as these may be instrumental to preserve the economy and the sustainability of the regime itself. One way to circumvent censorship is to use those channels that cannot be blocked as carriers for covert channels. In this project we study techniques to hide arbitrary sequences of data in the traffic generated by popular multimedia streaming applications, such as Skype and Google Hangouts, since these applications are widely used for business and private interaction and therefore cannot be blocked without significant social and economic impact to the repressive regime. Although tunneling protocols with this characteristic have been proposed in the past, they are limited on the type of information that can be transferred and on the type of interference they tolerate. We present a novel technique to encode a covert channel in synthesized video frames which can be transmitted through a video streaming protocol.