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A recent paper by Gunn-Allison-Abbott (GAA) [L.J. Gunn et al., ScientificReports 4 (2014) 6461] argued that the Kirchhoff-law-Johnson-noise (KLJN)secure key exchange system could experience a severe information leak. Here werefute their results and demonstrate that GAA's arguments ensue from a seriousdesign flaw in their system. Specifically, an attenuator broke the singleKirchhoff-loop into two coupled loops, which is an incorrect operation sincethe single loop is essential for the security in the KLJN system, and henceGAA's asserted information leak is trivial. Another consequence is that a fullydefended KLJN system would not be able to function due to its built-incurrent-comparison defense against active (invasive) attacks. In this paper wecrack GAA's scheme via an elementary current comparison attack which yieldsnegligible error probability for Eve even without averaging over thecorrelation time of the noise.

fluctuation and noise letters

Analysis of an attenuator artifact in an experimental attack by  Gunn-Allison-Abbott against the Kirchhoff-law-Johnson-noise (KLJN) secure key  exchange system