Information hiding in line spectrum pair feature of non-voice part of speech signal

Transmission of data in Voice over Internet Protocol (VoIP) must be made secure and robust such that data should not be easily attacked by intruders. Main objective of the proposed system is to hide the secret information in the silence part of speech signal for secure communication. Voice Activity Detection (VAD) Algorithm of ITU-T G.729B speech coder is performed to detect silence part of speech signal which is followed by Steganography for embedding and extraction of secret information. In order to evaluate the performance parameters for data hiding capacity in speech signal and for speech quality, the parameters like Perceptual Evaluation of Speech Quality (PESQ), Absolute error (ABS), Root Mean Square Error (RMSE), Mean Square Error (MSE), Mean Optimum Score (MOS) are explored. Robustness for proposed hiding scheme is performed by introducing compression attack and resampling of speech signal.