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)
© 2011 Optical Society of America
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