Attacking Physical Realizations of The Kish Scheme
While the idealized mathematical concept offers perfect information theoretic security, hacking attacks against the actual physical realization of the Kish scheme, utilizing non-ideal features, such as inaccuracies and stray resistive elements, can be exploited to extract transmitted key bits and the result is imperfect security that is still information theoretic. In 2005, Bergou proposed a method of finding such a weakness in the Kish scheme by utilizing the wire resistance. Then in 2006, Scheuer and Yariv analyzed Bergou's attack in detail. In 2010, Kish and Scheuer critically revisited the old Scheuer and Yariv results and showed that the original calculations of the Bergou-Scheuer-Yariv-attack were incorrect; moreover the new calculations indicate that the actual effect is about 1000 times weaker. Back in 2006, a defense against the Bergou-Yariv-Scheuer attack was mounted and then experimentally confirmed in 2007, where Mingesz et al. showed that it was possible to build a hardware realization communicating over two thousand kilometers with 99.98% fidelity and a maximum of a 0.19% leak to an eavesdropper. It also turns out that the sender can exactly calculate which of the bits have been detected by the eavesdropper—this was mathematically analyzed by Kish and Horvath in 2009.
Read more about this topic: Kish Cypher
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