Analysis of an attenuator artifact in an experimental attack by gunn-allison-abbott against the Kirchhoff-Law-Johnson-Noise (KLJN) secure key exchange system

Laszlo B. Kish, Zoltan Gingl, Robert Mingesz, Gergely Vadai, Janusz Smulko, Claes Göran Granqvist

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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

Original languageEnglish
Article number1550011
JournalFluctuation and Noise Letters
Volume14
Issue number1
DOIs
Publication statusPublished - Mar 12 2015

Keywords

  • KLJN secure key exchange system
  • directional coupler
  • experimental artifacts
  • unconditional security

ASJC Scopus subject areas

  • Mathematics(all)
  • Physics and Astronomy(all)

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