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Covert channels are unforeseen and stealthy communication channels thatenable manifold adversary scenarios. However, they can also allow the exchangeof confidential information by journalists. All covert channels described untilnow therefore need to craft seemingly legitimate information flows for theirinformation exchange, mimicking unsuspicious behavior.  In this paper, we present DYST, which represents a new class of covertchannels we call history covert channels jointly with the new paradigm ofcovert channel amplification.  History covert channels can communicate almost exclusively by pointing tounaltered legitimate traffic created by regular network nodes. Only anegligible fraction of the covert communication process requires the transferof actual covert channel information by the covert channel's sender. Thisallows, for the first time, an amplification of the covert channel's messagesize, i.e., minimizing the fraction of actually transferred secret data by acovert channel's sender in relation to the overall secret data being exchanged.We extend the current taxonomy for covert channels to show how history channelscan be categorized.  We describe multiple scenarios in which history covert channels can berealized, theoretically analyze the characteristics of these channels and showhow their configuration can be optimized for different implementations. Wefurther evaluate the robustness and detectability of history covert channels.

DYST (Did You See That?): An Amplified Covert Channel That Points To Previously Seen Data