Breaking chaotic shift key communication via adaptive key identification
Ren Hai-Peng(任海鹏)a)b)†, Han Chong-Zhao(韩崇昭)a), and Liu Ding(刘丁)b)
aState Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China; bSchool of Automation and Information Engineering, Xi'an University of Technology, Xi'an 710048, China
Abstract This paper proposes an adaptive parameter identification method for breaking chaotic shift key communication from the transmitted signal in public channel. The sensitive dependence property of chaos on parameter mismatch is used for chaos adaptive synchronization and parameter identification. An index function about the synchronization error is defined and conjugate gradient method is used to minimize the index function and to search the transmitter's parameter (key). By using proposed method, secure key is recovered from transmitted signal generated by low dimensional chaos and hyper chaos switching communication. Multi-parameters can also be identified from the transmitted signal with noise.
Received: 26 April 2007
Revised: 25 August 2007
Accepted manuscript online:
Fund: Project supported by the China
Postdoctoral Science Foundation (Grant No 20060390318), Natural
Science Foundation of Shaanxi
Province (Grant No 2007F017) and Fok Ying Tong Education Foundation.
Cite this article:
Ren Hai-Peng(任海鹏), Han Chong-Zhao(韩崇昭), and Liu Ding(刘丁) Breaking chaotic shift key communication via adaptive key identification 2008 Chin. Phys. B 17 1202
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