NDLI: Digital key chaos-communication systems with delay time concealment

Content Provider	IEEE Xplore Digital Library
Author	Nguimdo, R.M. Colet, P. Larger, L. Pesquera, L.
Copyright Year	2011
Description	Author affiliation: Instituto de Física Interdisciplinar y Sistemas Complejos, IFISC (CSIC-UIB), Campus Universitat de les Illes Balears, E-07122 Palma de Mallorca, SPAIN (Nguimdo, R.M.; Colet, P.) \|\| Instituto de Física de Cantabria (CSIC-Universidad de Cantabria), Santander E-39005, Spain (Pesquera, L.) \|\| UMR CNRS FEMTO-ST 6174/Optics Department, University of Franche-Comté, 16 Route de Gray, 25030 Besançon cedex, France (Larger, L.)
Abstract	Chaos-based optical communications has no clear counterpart of the digital key in algorithmic cryptography. Typically the chaotic carrier is generated using delayed optical or electro-optical systems. Confidentiality relies on hardware parameters that should be kept secret. Unfortunately, the delay time in itself cannot be a key parameter since it can be identified using autocorrelation function or delayed mutual information (DMI). We propose a scheme based on a double opto-electronic feedback system which allows on one hand to integrate a digital key required for decoding and on the other to conceal the delay time so that it cannot be identified from the time series using the typical methods. The scheme we propose is based on high speed phase chaos [1], with constant intensity and an essentially featureless power spectrum, and includes a send delay line in which a key random bit sequence (RBS) is included. The emitter dynamics is given by the dimensionless variables x(t) and y(t) equation equation where du1/dt = x, du2/dt = y, m(t) is the message and R(t) the RBS. The parameters are the MZI static phases φ1 = π/4 and φ2 = π/8, the feedback strengths β1 = β2 = 5, the time delays T1 = 17 ns and T2 = 15 ns, the fast (low) filter response times τ1 = 20 ps (θ1 = 1.6 µs) and τ2 = 12.2 ps (θ2 = 1.6 µs) and the MZI imbalanced time delays δT1 = 510 ps and δT2 = 400 ps. Figures. 1 b) and c) display DMI of the chaotic carrier as function of the delay without and with RBS, respectively. It is seen that without RBS, clear peaks appear at time-delays T, T + δT1, T + δT2 and T + δT1+ δT2. However, when RBS is employed, time-delays cannot be identified anymore. Similar results were obtained from the computation of the autocorrelation function. Figures 1 d) and e) show the effects of mismatch η in the key by measuring the root-mean-square synchronization error σ and quality factor, respectively. Considering 10 Gb/s message with amplitude of 0.6 for Fig 1 e), it appears that even 4% of key-mismatch is enough to considerably degrade the synchronization quality. Thus, we have shown that RBS can be an efficient way to both provide further security and conceal the time delays in some electro-optic systems.
Starting Page	1
Ending Page	1
File Size	297331
Page Count	1
File Format	PDF
ISBN	9781457705335
e-ISBN	9781457705328
DOI	10.1109/CLEOE.2011.5943128
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-05-22
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Driver circuits
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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