Open AccessBreaking a chaotic direct sequence spreading spectrum secure communication system
Author(s) -
Jinfeng Hu,
Jian Guo
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.1477
Subject(s) - chaotic , computer science , kalman filter , control theory (sociology) , transmitter , signal (programming language) , tracking error , spread spectrum , algorithm , synchronization (alternating current) , sequence (biology) , noise (video) , secure communication , filter (signal processing) , tracking (education) , telecommunications , artificial intelligence , channel (broadcasting) , computer vision , encryption , biology , genetics , psychology , pedagogy , control (management) , image (mathematics) , programming language , operating system
In this paper, a novel method is proposed for the breaking of chaotic direct sequence spread spectrum (CD3S) secure communication system. Chaotic fitting is defined based on the concept of generalized synchronization, then the method based on unscented Kalman filter and chaotic fitting is presented based on the principle of CD3S and the characteristic that the information symbol varies slowly. Furthermore, addressing to the tracking error induced by the processing noise and chaotic fitting error, a modified unscented Kalman filter based on tracking-error-controlled factor is suggested. The CD3S is unmasked according to the error-amplitude of the tracking-error. We can extract the binary message signal from the CD3S signal without knowing either the structure or the parameters of the chaotic transmitter. Simulation results verify the method.