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Chaotic systems provide a good mechanism for signal generation, with potential applications to communications. Because chaotic signals are difficult to predict, they can be used for bearing information signals in chaos-masking communication scheme. This paper describes communication with chaos. A message-bearing signal is hidden within the chaotic signal generated from the transmitter and recovered via chaos synchronization on the receiver side. Here in this paper, two analog computing circuits mimicking the characteristic of electro-optic modulator have been deployed as transmitter and receiver of the communication network. The whole setup has been realized in spice. The chaotic series obtained from the transmitter circuit was modulated and transmitted to the second one which behaves like a receptor and demodulates the chaotic signal through synchronization technique. The goal of this experiment was to design and simulate a simple chaos-masking communication scheme in SPICE using an electronic simulator for electro-optic modulator with a cos 2 type of nonlinearity and subsequently realizing the noisy model of the whole setup using OpAmp-based electronic circuit. Simulation and analysis reveal the fact that the said simulator is highly insusceptible to noise, which is good for communication. Keywords Chaos • Chaos-masking communication • Electro-Optic modulator • Additive white Gaussian noiseThis article is part of the topical collection "Cyber Security and Privacy in Communication Networks" guest-edited by Rajiv

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