The theories of synchronization based on secure communications using digital chaos are presented. A new synchronous method - cycles-interval pulse drive is developed and realized. Experimental results show it is available, and in order to reduce synchronous noise, a method using model references solves the ratio of signal power to noise power, so the secure communication system can he realized.
Geng Zhao, Deling Zheng, ShaojunHuang 1)College of Electric Science and Technology Beijing. Beijing 100070, China 2)Information Engineering School, University of Science and Technology Beijing. Beijing 100083, China
The fixed points in logistic mapping digital-flow chaos strange attractor are studied in detail. When k=n in logistic equa-tion, there exist no more than 2n fixed points, which are deduced and proved theoretically. Three corollaries about the fixed points oflogistic mapping are proposed and proved respectively. These theoretn and corollaries provide a theoretical basis for choosingparameter of chaotic sequences in chaotic secure communication and chaotic digital watermarking. And they are testified by simulation.
