A new method to secure speech communication using the discrete wavelet transforms (DWT) and the fast Fourier\r\ntransform is presented in this article. In the first phase of the hiding technique, we separate the speech\r\nhigh-frequency components from the low-frequency components using the DWT. In a second phase, we exploit\r\nthe low-pass spectral proprieties of the speech spectrum to hide another secret speech signal in the low-amplitude\r\nhigh-frequency regions of the cover speech signal. The proposed method allows hiding a large amount of secret\r\ninformation while rendering the steganalysis more complex. Experimental results prove the efficiency of the\r\nproposed hiding technique since the stego signals are perceptually indistinguishable from the equivalent cover\r\nsignal, while being able to recover the secret speech message with slight degradation in the quality.
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