Blowfish–Secured Audio Steganography

Data security has become essential to provide secure communication that is free of attacks. A combination of steganography and cryptography provides very secure communication, where steganography hides the secret data and cryptography scrambles the secret data into an unreadable form. This paper proposes a message security scheme that applies audio steganography and cryptography to provide a secure communication by embedding a secret message inside an audio file. The Blowfish algorithm is used for cryptography and the LSB coding technique is used for steganography. The LSB coding alternates between the left channel and the right channel respectively. The proposed scheme is evaluated in terms of the mean square error (MSE), peak signal to noise ratio (PSNR), a hearing test and a comparison between the waveform plots of the cover and stego audios. The results prove that the proposed scheme exhibits very good performance. In addition, it is found to surpass other proposed schemes from the literature with much higher PSNR values.