Nonlinear Sciences – Chaotic Dynamics
Scientific paper
2004-06-28
Nonlinear Sciences
Chaotic Dynamics
12 pages, 8 figures, LaTeX format
Scientific paper
10.1016/j.chaos.2004.07.006
This paper describes the security weakness of a recently proposed improved chaotic encryption method based on the modulation of a signal generated by a chaotic system with an appropriately chosen scalar signal. The aim of the improvement is to avoid the breaking of chaotic encryption schemes by means of the return map attack introduced by Perez and Cerdeira. A method of attack based on taking the absolute value of the ciphertext is presented, that allows for the cancellation of the modulation scalar signal and the determination of some system parameters that play the role of system key. The proposed improved method is shown to be compromised without any knowledge of the chaotic system parameter values and even without knowing the transmitter structure.
Alvarez Gonzalo
Montoya Fausto
Pastor Gerardo
Romera Miguel
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