Kleptographic Attacks on a Cascade of Mix Servers
  Przemyslaw Kubiak, Miroslaw Kutylowski, Filip Zagorski,

     Institute of Mathematics and Computer Science
            Wroclaw University of Technology



A cascade of mix servers is a vital part of e-voting protocols
and other schemes which goal is to protect user's anonymity.
In this paper we present kleptographic attacks on an exemplary
cascade. To depict interesting consequences, we have chosen
a cascade used as a building block of a Pret a Voter
e-election protocol. However, the attacks might be generalized
to any cascade of probabilistic mix servers.