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Proceedings Paper

Delay time identification in chaotic optical systems with two delays
Author(s): A. Locquet; S. Ortin; V. Udaltsov; L. Larger; D. S. Citrin; L Pesquera; A. Valle
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Paper Abstract

We study the identification of the delays of several chaotic optical cryptosystems subjected to one or two delayed feedbacks. We show that the delay of a single-delay system can be identified, even if highly complex chaos is used. For certain types of systems with two delays, the same identification techniques that work for single-delay systems also work for multiple-delay systems. These systems thus do not provide a significant increase of the security level. A careful choice of the architecture of multiple-delay system can, however, make these techniques fail. We propose some higher-dimensional techniques that lead to the identification of the delays for these architectures too. The increased complexity of these techniques means, however, that it takes a significantly longer time to identify the delays.

Paper Details

Date Published: 14 April 2006
PDF: 12 pages
Proc. SPIE 6184, Semiconductor Lasers and Laser Dynamics II, 61840L (14 April 2006); doi: 10.1117/12.662751
Show Author Affiliations
A. Locquet, Unite Mixte Internationale, CNRS, Georgia Tech Lorraine (France)
Institut FEMTO-ST (France)
Georgia Institute of Technology (United States)
S. Ortin, CSIC, Univ. de Cantabria (Spain)
V. Udaltsov, Institut FEMTO-ST (France)
L. Larger, Institut FEMTO-ST (France)
D. S. Citrin, Unite Mixte Internationale, CNRS, Georgia Tech Lorraine (France)
Georgia Institute of Technology (United States)
L Pesquera, Univ. de Cantabria (Spain)
A. Valle, Univ. de Cantabria (Spain)


Published in SPIE Proceedings Vol. 6184:
Semiconductor Lasers and Laser Dynamics II
Daan Lenstra; Markus Pessa; Ian H. White, Editor(s)

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