<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2006000500013</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización de un mensajero caótico binario con ruido en el canal: simulación y experimentación]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Núñez-Pérez]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro de Investigación Científica y de Educación Superior de Ensenada Electrónica y Telecomunicaciones ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2006</year>
</pub-date>
<volume>52</volume>
<numero>5</numero>
<fpage>464</fpage>
<lpage>473</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2006000500013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2006000500013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2006000500013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se obtienen las características de un mensajero caótico binario, basado en conmutación paramétrica, tanto a nivel simulación como experimental para explorar su capacidad de encriptamiento en la realidad. Se averiguan las características más importantes y no reportadas como son: a) el cambio mínimo en el parametro tal que su acción sobre la forma de onda de la señal caótica sincronizadora sea imperceptible a un posible espía en el canal ruidoso; b) el nivel máximo del ruido permitido para que el cambio mínimo en el parámetro siga operando; y c) los tiempos en los retardos para que la recuperación de la información binaria sea rápida. Se concluye que el ruido en el canal limita notablemente el funcionamiento real del mensajero estudiado; para superar esto, se propone un mensajero caótico completamente digital.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[A binary chaotic messenger is characterized, based on parameters' commutation, using simulation and experimental procedures to explore his real encrypted communication capacity. The characteristics to find out are: a) Parameter minimum change in such a way the change, of synchronization chaotic signal, be invisible to some spy at the noisy channel, and b) Noise maximum level and c) Time delays allow just to make reliable the binary information recovery. Because, the noisy channel allow hardly the messenger studied right performance, the solution is through a new digital chaotic messenger]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Circuito de Chua]]></kwd>
<kwd lng="es"><![CDATA[sincronización de circuitos caóticos]]></kwd>
<kwd lng="es"><![CDATA[conmutación paramétrica]]></kwd>
<kwd lng="es"><![CDATA[ruido en el canal]]></kwd>
<kwd lng="es"><![CDATA[comunicación encriptada robusta]]></kwd>
<kwd lng="en"><![CDATA[Chua's circuit]]></kwd>
<kwd lng="en"><![CDATA[synchronization of chaotics circuits]]></kwd>
<kwd lng="en"><![CDATA[parameter commutation]]></kwd>
<kwd lng="en"><![CDATA[channel noise]]></kwd>
<kwd lng="en"><![CDATA[robust encrypted communication]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Instrumentaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Caracterizaci&oacute;n de un mensajero ca&oacute;tico binario con ruido en el canal: simulaci&oacute;n y experimentaci&oacute;n</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>R. N&uacute;&ntilde;ez&#150;P&eacute;rez</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Electr&oacute;nica y Telecomunicaciones,  Centro de Investigaci&oacute;n Cient&iacute;fica y de Educaci&oacute;n Superior de Eda.(CICESE), </i><i>Km. 107, Carr. Tj.&#150;Eda., Eda., B.C., M&eacute;xico,  Tel/Fax (646) 175&#150;0500/537 e&#150;mail: <a href="mailto:rnunez@cicese.mx" target="_blank">rnunez@cicese.mx</a></i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 27 de enero de 2005    <br>   Aceptado el 29 de marzo de 2006</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">Se obtienen las caracter&iacute;sticas de un mensajero ca&oacute;tico binario, basado en conmutaci&oacute;n param&eacute;trica, tanto a nivel simulaci&oacute;n como experimental para explorar su capacidad de encriptamiento en la realidad. Se averiguan las caracter&iacute;sticas m&aacute;s importantes y no reportadas como son: a) el cambio m&iacute;nimo en el parametro tal que su acci&oacute;n sobre la forma de onda de la se&ntilde;al ca&oacute;tica sincronizadora sea imperceptible a un posible esp&iacute;a en el canal ruidoso; b) el nivel m&aacute;ximo del ruido permitido para que el cambio m&iacute;nimo en el par&aacute;metro siga operando; y c) los tiempos en los retardos para que la recuperaci&oacute;n de la informaci&oacute;n binaria sea r&aacute;pida. Se concluye que el ruido en el canal limita notablemente el funcionamiento real del mensajero estudiado; para superar esto, se propone un mensajero ca&oacute;tico completamente digital.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Circuito de Chua; sincronizaci&oacute;n de circuitos ca&oacute;ticos; conmutaci&oacute;n param&eacute;trica; ruido en el canal; comunicaci&oacute;n encriptada robusta.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">A binary chaotic messenger is characterized, based on parameters' commutation, using simulation and experimental procedures to explore his real encrypted communication capacity. The characteristics to find out are: a) Parameter minimum change in such a way the change, of synchronization chaotic signal, be invisible to some spy at the noisy channel, and b) Noise maximum level and c) Time delays allow just to make reliable the binary information recovery. Because, the noisy channel allow hardly the messenger studied right performance, the solution is through a new digital chaotic messenger</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Chua's circuit; synchronization of chaotics circuits; parameter commutation; channel noise; robust encrypted communication.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 05.45.Vx; 05.45.Xt; 05.45.Gg</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v52n5/v52n5a13.pdf">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>     <p align="justify"><font face="verdana" size="2">Agradecemos al CONACYT por apoyar econ&oacute;micamente el presente. Proyecto 31874&#150;1, dirigido por el Dr. C. Cruz H.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. U. Parlitz, L.O. Chua, Lj. Kocarev, K.S. Halle y A. Shang, <i>Int. J. Bifurc. 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