Information Hiding in Audio Signals

Abstract

ABSTRACT Steganography is the practice of encoding secret information in indiscernible way. Audio Steganography is a technique used to transmit hidden information by modifying an audio signal in an imperceptible manner. It is mainly required for increasing security in transferring and archiving of audio files. Modern advances in computer, communication and signal Steganography complements procesrather than replaces encryption by adding another layer of security- of steganography. These advances have broadened it is much more difficult to decrypt a message if it is not known that there is a message. The basic idea of the paper is to present methods that hides information (audio, image and text) in cover audio using Least Significant Bit (LSB) coding method along with encryption so as to increase the security. Two novel methods have been proposed in this paper, one is considering parity of the digitized samples of cover audio and the other is considering the XOR operation. A novel method which is an extension to the XOR method that uses multiple LSB‟s for data embedding is also proposed. Experimental results are presented in this paper to demonstrate the effectiveness of the proposed methods. In addition, subjective listening tests are performed and the perceptual quality of the stego audio signal is found to be high.