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Mathematical Problems in Engineering
Volume 2014, Article ID 782629, 7 pages
http://dx.doi.org/10.1155/2014/782629
Research Article

Encryption in Chaotic Systems with Sinusoidal Excitations

División de Electrónica y Computación, Centro Universitario de Ciencias Exactas e Ingenierías (CUCEI), Universidad de Guadalajara, Avenida Revolución 1500, 44430 Guadalajara, JAL, Mexico

Received 4 December 2013; Revised 14 February 2014; Accepted 7 March 2014; Published 13 April 2014

Academic Editor: Hamid Reza Karimi

Copyright © 2014 G. Obregón-Pulido et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this contribution an encryption method using a chaotic oscillator, excited by “n” sinusoidal signals, is presented. The chaotic oscillator is excited by a sum of “n” sinusoidal signals and a message. The objective is to encrypt such a message using the chaotic behavior and transmit it, and, as the chaotic system is perturbed by the sinusoidal signal, the transmission security could be increased due to the effect of such a perturbation. The procedure is based on the regulation theory and consider that the receiver knows the frequencies of the perturbing signal, with this considerations the algorithm estimates the excitation in such a way that the receiver can cancel out the perturbation and all the undesirable dynamics in order to produce only the message. In this way we consider that the security level is increased.