In this paper, we propose a new chaos-based communication scheme using observers. The novelty lies in the masking procedure that is employed to hide the confidential information using the chaotic oscillator. We use a combination of the so-called addition and inclusion methods to mask the information. We compare two observers, the proportional observer (P-observer) and the proportional integral observer (Pi-observer) that are employed as receivers for the proposed communication scheme. We show that the P-observer is not suitable for the proposed communication scheme since it imposes unpractical constraints on the messages to be sent. On the other hand, we show that the PI-observer is the best solution for the proposed communication scheme since it allows greater flexibility in choosing the gains of the observer and it does not impose any unpractical restriction on the message.
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