Identifying attributes and insecurity of a public-channel key exchange protocol using chaos synchronization
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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
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.
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