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What kind of noise guarantees security for the Kirchhoff-Loop-Johnson-Noise key exchange?
This article is a supplement to our recent one about the analysis of the
noise properties in the Kirchhoff-Law-Johnson-Noise (KLJN) secure key exchange
system [Gingl and Mingesz, PLOS ONE 9 (2014) e96109,
doi:10.1371/journal.pone.0096109]. Here we use purely mathematical statistical
derivations to prove that only normal distribution with special scaling can
guarantee security. Our results are in agreement with earlier physical
assumptions [Kish, Phys. Lett. A 352 (2006) 178-182, doi:
10.1016/j.physleta.2005.11.062]. Furthermore, we have carried out numerical
simulations to show that the communication is clearly unsecure for improper
selection of the noise properties. Protection against attacks using time and
correlation analysis is not considered in this paper
Noise properties in the ideal Kirchhoff-Law-Johnson-Noise secure communication system
In this paper we determine the noise properties needed for unconditional
security for the ideal Kirchhoff-Law-Johnson-Noise (KLJN) secure key
distribution system using simple statistical analysis. It has already been
shown using physical laws that resistors and Johnson-like noise sources provide
unconditional security. However real implementations use artificial noise
generators, therefore it is a question if other kind of noise sources and
resistor values could be used as well. We answer this question and in the same
time we provide a theoretical basis to analyze real systems as well
Comments On "A New Transient Attack On The Kish Key Distribution System"
A recent IEEE Access Paper by Gunn, Allison and Abbott (GAA) proposed a new
transient attack against the Kirchhoff-law-Johnson-noise (KLJN) secure key
exchange system. The attack is valid, but it is easy to build a defense for the
KLJN system. Here we note that GAA's paper contains several invalid statements
regarding security measures and the continuity of functions in classical
physics. These deficiencies are clarified in our present paper, wherein we also
emphasize that a new version of the KLJN system is immune against all existing
attacks, including the one by GAA.Comment: Accepted for publication in the journal Metrology and Measurement
Systems (May 2016
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