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14 April 2006 Delay-time identification in chaotic optical systems with two delays
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Locquet, S. Ortin, V. Udaltsov, L. Larger, D. S. Citrin, L Pesquera, and A. Valle "Delay-time identification in chaotic optical systems with two delays", Proc. SPIE 6184, Semiconductor Lasers and Laser Dynamics II, 61840L (14 April 2006);


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