A Hybrid Secure Communication Method Based on the Synchronization of Hyper-chaos Systems

Using the synchronization of hyper-chaotic oscillators with only one variable coupled and the two-channel transmission method, a hybrid secure communication scheme with two channels based on the hyper-chaos synchronization is proposed in this paper. In this scheme, several hyper-chaotic variables at the transmitter are used to generate digital key and masking signal, information signals are first encrypted by secret key and then masked by hyper-chaotic masking signal. The masked signals are transmitted through one channel, and the other channel is used to transmit single variable which is coupled to the receiver to drive two hyper-chaotic oscillators to synchronize. The information signals can be recovered precisely at the receiver. Computer simulation is performed to verify the results.