by Ira S. Moskowitz, Richard E. Newman, Daniel P. Crepeau, Allen R. Miller
In Workshop on Privacy in the Electronic Society (WPES 2003
http://www.freehaven.net/anonbib/./cache/moskowitz:wpes2003.ps
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Abstract:
There have long been threads of investigation into covert channels, and threads of investigation into anonymity, but these two closely related areas of information hiding have not been directly associated. This paper represents an initial inquiry into the relationship between covert channel capacity and anonymity, and poses more questions than it answers. Even this preliminary work has proven di#cult, but in this investigation lies the hope of a deeper understanding of the nature of both areas. MIXes have been used for anonymity, where the concern is shielding the identity of the sender or the receiver of a message, or both. In contrast to tra#c analysis prevention methods which conceal larger tra#c patterns, we are concerned with how much information a sender to a MIX can leak to an eavesdropping outsider, despite the concealment e#orts of MIXes acting as firewalls.
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