CRACKING THE LIU KEY EXCHANGE PROTOCOL IN ITS MOST SECURE STATE WITH LORENTZIAN SPECTRA Academic Article

abstract

• We have found a security risk in the Liu's cypher based on random signals and feedback, when it utilizes a large class of noises for communication in its most secure state, the steady state. For the vulnerability to exist, the noise must have a spectrum which can be transformed to white-like noise by linear filtering. For the cracking, we utilize the natural properties of power density spectra and autocorrelation functions. We introduce and demonstrate the method for Lorentzian spectra. Some of the implications of the results concern the transient operation during changing bits, where the modulation products of noise cannot be band-limited therefore the cypher is vulnerable. We propose the application of line filters to provide a proper spectral shape and to improve the security.

authors

• Kish, Laszlo

published proceedings

• FLUCTUATION AND NOISE LETTERS

author list (cited authors)

• Kish, L. L., Zhang, B., & Kish, L. B.

citation count

• 8

complete list of authors

• Kish, Lazar L||Zhang, Bruce||Kish, Laszlo B

publication date

• March 2010

publisher

• World Scientific Publishing  Publisher

published in

• Fluctuation and Noise Letters (FNL)  Journal

keywords

• Secure Communication By Classical Physics

Digital Object Identifier (DOI)

• 10.1142/S0219477510000058

start page

• 37

end page

• 45

volume

• 9

issue

• 1

URL

• http%3A%2F%2Fdx.doi.org%2F10.1142%2Fs0219477510000058