Hyperchaotic circuits for secure communications: an efficient synchronization technique

In this paper an efficient method is illustrated to obtain a secure communication system by means of the synchronization of hyperchaotic circuits. The approach consists in driving the receiver with a proper number of transmitted signals, each of them constituted by a chaotic masking waveform added to an information-bearing signal, and by keeping the transmitting system equivalent to the receiving one by means of a feedback technique. The suggested method assures a recovery of the information signals without degradation, and enhances the security of the communication scheme, since the utilization of several driving signals makes more difficult for an undesirable listener to synchronize with the transmitter. Simulation results are reported to confirm the capability of the proposed approach.