Abstract
The security of the Kirchhoff-law-Johnson-(like)-noise (KLJN) key exchange system is based on the fluctuation-dissipation theorem of classical statistical physics. Similarly to quantum key distribution, in practical situations, due to the non-idealities of the building elements, there is a small information leak, which can be mitigated by privacy amplification or other techniques so that unconditional (information-theoretic) security is preserved. In this paper, the industrial cable and circuit simulator LTSPICE is used to validate the information leak due to one of the non-idealities in KLJN, the parasitic (cable) capacitance. Simulation results show that privacy amplification and/or capacitor killer (capacitance compensation) arrangements can effectively eliminate the leak.
Highlights
The Kirchhoff-law-Johnson-(like)-noise (KLJN) key exchange system [1,2,3,4] was first introduced in 2005
It was claimed that only quantum key distribution (QKD) [5] could offer unconditional security
Studies have consistently shown that both the ideal and the practical KLJN versions remain unconditionally secure [4,34,35,36,37,38,39,40,41,42,43] despite facing various attacks and related information leaks associated with the non-idealities of components in the system
Summary
The Kirchhoff-law-Johnson-(like)-noise (KLJN) key exchange system [1,2,3,4] was first introduced in 2005. It was claimed that only quantum key distribution (QKD) [5] could offer unconditional (that is, information-theoretic) security. We use the industrial cable and circuit simulator LTSPICE by Linear Technology to simulate practical realizations of the KLJN system and to evaluate the cable capacitance attack. Solutions to mitigate this attack, such as the capacitor killer arrangement [39] and privacy amplification [44], are tested
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