Disclosed is a chaotic system synchronization apparatus and a secret communication system using the chaotic system synchronization apparatus by feedbacking a noise or chaotic signal to a predetermined parameter of a main chaotic system and a variable of a dependent chaotic system corresponding thereto. In other words, when there are two same systems in which chaos occurs, the same noise or chaotic signal is added to each of the variables of the main chaotic system or to various variables of the main chaotic system or to the dependent chaotic system corresponding to each variable of the main chaotic system, , The temporal and spatial changes of the corresponding variables in the main chaotic system and the dependent chaotic systems are synchronized and synchronized with each other. At this time, the signal of each chaotic system is different from the chaotic attractor that the chaotic system has from the beginning, and it makes the unique space-time attractor so that it can not find the original chaotic signal and can increase the degree of confidentiality in secret communication.
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