Eur. Phys. J. Special Topics 225, 2655-2667 (2016)
https://doi.org/10.1140/epjst/e2015-50318-7

Regular Article

A discrete-time chaos synchronization system for electronic locking devices

¹ Centro Universitario de los Lagos, Unversidad de Guadalajara, Av. Enrique Díaz de León 1144, Col. Paseos de la Montaña, Lagos de Moreno, Jalisco, México
² Universidad Autónoma de Nuevo León, Facultad de Ingeniería Mecánica Eléctrica, Nuevo León, México

^a e-mail: mineromg@lagos.udg.mx
^b e-mail: dlopez@culagos.udg.mx
^c e-mail: ccastaneda@lagos.udg.mx
^d e-mail: ghuerta@lagos.udg.mx
^e e-mail: rchiu@culagos.udg.mx
^f e-mail: hugo@culagos.udg.mx
^g e-mail: rjaimes@culagos.udg.mx
^h e-mail: edgar@culagos.udg.mx
ⁱ e-mail: cornelio.posadascs@uanl.edu.mx

Received: 24 November 2015
Revised: 20 March 2016
Published online: 22 November 2016

Abstract

This paper presents a novel electronic locking key based on discrete-time chaos synchronization. Two Chen chaos generators are synchronized using the Model-Matching Approach, from non-linear control theory, in order to perform the encryption/decryption of the signal to be transmitted. A model/transmitter system is designed, generating a key of chaotic pulses in discrete-time. A plant/receiver system uses the above mentioned key to unlock the mechanism. Two alternative schemes to transmit the private chaotic key are proposed. The first one utilizes two transmission channels. One channel is used to encrypt the chaotic key and the other is used to achieve output synchronization. The second alternative uses only one transmission channel for obtaining synchronization and encryption of the chaotic key. In both cases, the private chaotic key is encrypted again with chaos to solve secure communication-related problems. The results obtained via simulations contribute to enhance the electronic locking devices.