A system inversion approach to chaos-based secure speech communication

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)2569-2582
Journal / PublicationInternational Journal of Bifurcation and Chaos in Applied Sciences and Engineering
Issue number8
Publication statusPublished - Aug 2005


A new approach to real-time secure speech communication is proposed based on the inversion theory of nonlinear discrete-time dynamical systems. The proposed approach uses an observable minimal-phase nonlinear discrete-time dynamical system, particularly with chaotic zerodynamics, as the drive system to generate encrypted speech signals for transmission. The receiver is the minimal left-inverse system of the drive system. The receiver decrypts the received signal and recovers the original message in real-time. The effectiveness of the proposed approach and design is demonstrated via examples for secure speech signal transmission. Performance evaluation of the designed secure communication system is discussed. Both analysis and simulation show that the new scheme is relatively secure but simple, accurate and robust, suitable for some civil and commercial voice-communication applications. © World Scientific Publishing Company.

Research Area(s)

  • Chaos, Left-inversion, Nonlinear dynamics, Secure communication