Identifying attributes and insecurity of a public-channel key exchange protocol using chaos synchronization
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Klein et al. proposed a key exchange protocol using chaos synchronization. The first protocol comprises two parties with chaotic dynamics that are mutually coupled and undergo a synchronization process, at the end of which they can use their identical dynamical state as an encryption key. From cryptographic point of view, their key exchange protocol is a key agreement protocol. Klein et al. claimed that their key agreement can be carried out over a public channel. In order to increase the key space and decrease the precision of the calculation, they made an extension of the system to anetwork of N Lorenz equations. In this paper, we will provide a cryptanalysis of their key agreement protocol. We will first point out some weaknesses, and then show that their protocol is not secure against several attacks including impersonation attack.
The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/967/description#description. Copyright © 2009 Elsevier B.V. All rights reserved
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