CIFRADO CAOTICO

Abstract

We propose the cipher of plain files by means ofa flow cryptosystem scheme with chaotic addition and asymmetric key. The sequence of pseudorandom numbers isgenerated by a continuous chaotic dynamical system; inparticular we choose the forced Duffing equation. Since itkind of systems are sensitive with respect to the initialconditions, we achieve a method that is strong against anystatistical attack. In a chaotic system, during the process ofnumeric integration internal and output variables aretruncated because of the finite representation of thecomputer. It could turn the chaotic answer into a periodicone. In this letter, we illustrate a heuristic method to breakthis periodicity through a two- dimensional system. In ourlaboratory analysis we statically compare this method withother known stream and block techniques and we found theCPU encryption time is suitable and linear respect to the filesize.

 

 

Index Terms - cryptography, Stream cipher, chaotic system, Chaos, Security, Duffing equation.