Private key encryption of speech signal based on three dimensional chaotic map
F.J. Farsana, K. Gopakumar · 2017
This paper presents a private key data encryption algorithm based on three dimensional chaotic map. It is based on confusion and diffusion of speech samples using secret keys generated by logistic & two dimensional Duffing map. Chaotic systems can generate pseudo random numbers (PRN) of highly complex dynamical properties. Three dimensional chaotic functions are proofed with sound randomness and unpredictability. In this method, the speech scrambles are compressed by DCT to reduce residual intelligibility. In this techniques Speech samples are initially masked by key stream generated by logistic function. After first level encryption speech scrambles undergoes permutation process by Duffing map. Simulations results are presented in the paper shows that the encryption algorithm provides encryption speech samples of low residual intelligibility, key sensitivity and high quality recovered signal. Total key space for the proposed encryption algorithm is (2^192), which is large enough to protect the information from brute force attack. The proposed method is computationally less complex since it uses lower dimensional chaotic maps.