This paper throws light on chaotic shift keying-based speech encryption and decryption method. In this method, the input speech signals are sampled and its values are segmented into four levels, namely L 0 , L 1 , L 2 , and L 3 . Each level of sampled values is permuted using four chaotic generators such as logistic map, tent map, quadratic map, and Bernoulli's map. A chaotic shift keying mechanism assigns logistic map for L 0 , tent map for L 1 , quadratic map for L 2 , and Bernoulli's map for L 3 for shuffling the speech samples at every level. Further, the sampled values are permuted using Chen map which uncovers the chaotic behavior. Various testing methods are applied to analyze the efficiency of the system. The results prove that the proposed system is highly secured against the attackers and possesses a powerful diffusion and confusion mechanism for better speech communication in the field of telecommunication.

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