A new Secure Speech Communication Scheme Based on Hyperchaotic Masking and Modulation.

Abstract

This paper presents a new, effective, simple, and more secure speech communication technique based on the combination of hyperchaotic masking and modulation. One hyperchaotic system is used for both masking and modulation operations. Speech communication techniques based on only chaotic masking have weak resistance to several attacks. So, further encryption is applied using chaotic modulation. Second-level encryption has enhanced the security of speech communication, as evidenced by the performance metrics. The encryption correlation coefficient between the original signal and the encrypted signal after chaotic masking is 0.0101. However, the correlation coefficient has become 0.0007 after the second level of encryption. Again, the speech signal segmental spectral signal to noise ratio (SSSNR) is -32.5160 dB after the first level of encryption, but the SSSNR becomes - 47.2612 dB after performing chaotic modulation in the second level of encryption. The decryption process is achieved successfully and the original speech signal is retrieved. The required synchronization is performed using an active controller.