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Security improvement for CSK via breaking time correlation among state variables

This paper presents a novel method to improve the security of the modulation technique of chaos shift keying (CSK). The strategy developed in the method is to remove correlation among state variables by means of applying delays to state variables in constitution of transmitted signal. The proposed method is tested under several applicable breaking techniques, i.e. of return map, power analysis, and generalized synchronization. It is shown that the proposed method can resist from conventional attacking techniques. Numerical simulation will be demonstrated with Lorenzpsilas system to verify the effectiveness of the method.