Chaos Based Secure Image Hiding in Variable Bit Rate CELP Speech Coding Systems

Abstract

Audio Steganography is a powerful tool for protecting important data during transmission. Inaudibility and robustness are two substantial requirements for an effective audio steganography algorithm. In this paper, a simple and effective hiding approach in the bit stream of a Code Excited Linear Prediction (CELP) speech codec using random sequences generated by chaotic maps, is proposed. Chaotic maps were used in our scheme for two important purposes: Encryption of the secret image using hopping between multiple random sequences generated by different logistic maps, and selecting of random bit locations in LSB of linear prediction coefficients of speech for hiding image bits. This approach boosts algorithm security. The technique has been evaluated extensively in terms of PESQ and PSNR, and the simulation results prove the effectiveness of information transmission with a fiddling effect on the quality of the coded speech.